2007 Vol. 15, No. 6

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Effects of CO2-induced change on wheat straw quality, quantity and decomposition
CHEN Chun-Mei, XIE Zu-Bin, ZHU Jian-Guo, DOU Sen
2007, 15(6): 1-5.
Abstract(966) PDF(863)
Abstract:
The effect of CO2 enrichment on the quality and quantity of wheat straw, wheat straw decomposition and anaerobic soil microbial biomass activity was examined in rice season. Analysis shows that elevated CO2 significantly enhances C/N and lignin/N rations of wheat straw due primarily to decreased N content. However, elevated CO2 has no effect on biochemical compositions (soluble fractions, semi-cellulose, cellulose and lignin) and phenol content of wheat straw. Alteration of wheat straw quality caused by elevated CO2 has insignificant effect on wheat straw and wheat straw C decomposition, but rather significantly retardes wheat straw N decomposition. When all produced wheat straw under ambient and elevated CO2 are added to the soil, elevated CO2 alteration of wheat straw quantity has no obvious impact on subsequent wheat straw decomposition. Change in wheat straw quality from elevated CO2 insignificantly affects subsequent soil microbial biomass C. This implicitly explains any lack of effect of elevated CO2 on wheat straw quality, decomposition and C content.
Tea plantation environment and quality under different degrees of shading
XIAO Run-Lin, WANG Jiu-Rong, SHAN Wu-Xiong, LI Xing-Hui, SONG Tong-Qing, TANG Yu
2007, 15(6): 6-11.
Abstract(2578) PDF(1691)
Abstract:
Environmental factors, photosynthesis and evaporation characteristics, and tea ingredients were studied at a selected tea field with 80%, 61% and 37% shadings in the summer and autumn. Results show that shading operation remarkably reduces air temperature, leaf surface temperature, ground temperature and soil temperature, and increases soil water contents and air humidity. Shading effects on tea garden environment are enhanced with increase in shading degree. In comparison with unshaded tea garden, net photosynthetic rates of tea under 80%, 61%, 37% shadings increase by 365%, 283%, 68% respectively; chlorophyll-a contents in the tea leaves increase by 57.5%， 29.3% and 15.9%， and total chlorophyll contents increase by 52.2%, 29.2% and 14.3% respectively; amino-acid (AA) contents increase by 68.6%, 33.5% and 2.16% respectively; and tea polyphenol (TP) contents drop by 15.3%, 12.5% and 5.4% respectively. TP/AA ratio in processed tea from two-leaf and one-bud-shoot under 80% shading meets high-grade green-tea standards, and that at 61% and 37% shadings reaches fine-grade green-tea standards; much better than those of unshaded tea gardens.
Diversification of expansion capacity and efficiency of cloned Hemarthria compressa
LIU Jin-Ping, ZHANG Xin-Quan, YOU Ming-Hong, CHEN Yong-Xia, WANG Xun
2007, 15(6): 12-17.
Abstract(1489) PDF(1112)
Abstract:
Choosing cloned individual Hemarthria compressa unit natural height and stolon length as horizontal and vertical parameters, stolon length to natural height ratio as plant shape index, spacial expansion volume as expansion capacity, unit volume tiller number as expansion entropy and unit volume biomass as expansion efficiency, spatial expansion capacity and efficiency of 67 individuals of H. compressa were analyzed and compared in booting stage. The variation range (10.67～103.00cm) and coefficient of variation (CV,54.39%) of vertical parameter are higher than those of horizontal parameters (54.67～120.67cm, 16.94%). The variation range of orphological index is 1.03～8.72 with 60.18% CV, expansion area is 0.72～5.53m2 with 49.67% CV, expansion capacity is 0.16～5.58m3 with 104.17% CV, expansion efficiency is 0.38～3.16kg/m3 with 50.34% CV and expansion entropy CV is 74.29%. A positive correlation exists between individual plant expansion capacity and vertical and horizontal parameters as well as expansion area with correlation coefficients of 0.8908, 0.6620 and 0.6749, respectively. There is also a positive correlation between expansion efficiency and expansion entropy (r=0.8429), while a negative correlation exists between expansion capacity and expansion efficiency (r=-0.5310) and entropy (r=-0.6255). Through cluster analysis, the sixty-seven resources are categorized into four groups, at an euclidean distances of 15. Spatial expansion capacity and efficiency of H. ompressa resources are highly diversified and beneficial to the selection and tilization of excellent breeds and strains.
Changing trend of precipitation and its effects on crop productivity in the piedment of Taihang Mountain
SUN Hong-Yong, LIU Chang-Ming, WANG Zhen-Hua, ZHANG Xi-Ying, DONG Bo-Fei
2007, 15(6): 18-21.
Abstract(1555) PDF(1167)
Abstract:
Rainfall data from 1960 to 2005 was collected and analyzed to find the change trend and to estimate the crop water requirement. Field experiments were conducted at Luancheng Agro-ecology Experimental Station from 1996 to 2005 to calculate the soil water consumption. The results present 5.1mm/a rainfall decrease during last 46 years, especially in the summer maize growing periods. The water requirement of winter wheat is 2 times of that of summer maize. The field experiment shows that the crop yield is significantly related with rainfall in rain-fed area, and the crop yield does not varies obviously under water-saving irrigation. The rational irrigation should be taken in the future.
Characteristics of artificial plantation communities and soil properties along highway slopes of semi-arid regions
YU Hai-Long, GU Wei, JIANG Yuan, LIU Yong-Bing
2007, 15(6): 22-25.
Abstract(1492) PDF(1277)
Abstract:
Temporal changes in plant communities and soil properties, one to two years after vegetation establishment along the Hu-Ji Highway slopes wereinvestigated to assess the process and mechanism of soil fertility and vegetation restoration. The results indicate plant communities and soil have gradual restored with time after artificial vegetation construction. Slit, clay, organic matter and total N contents increase, but pH decreases with the time. Soil recovery within 0～10cm depth is more significant than within 10～20cm depth. The vegetation is developing into complex communities with increases of herbaceous plants and plant coverage. However, the highway slope eco-system is still unstable because annual grass forms the majority of the community along the slopes.
Ecological effect of windbreaks and sand-fixation forests on Heihe River valley—A case study of Gaotai County,Gansu Province
LIAO Kong-Tai, YAN Zi-Zhu, MAN Duo-Qing, ZHANG Jin-Chun, LI De-Lu
2007, 15(6): 26-29.
Abstract(1472) PDF(1478)
Abstract:
This paper, through positioning observation of sand-fixation windbreak systems in Gaotai region of Heihe River valley, analyzed changes in ecological effect of sand-fixation forest in recent 20 years. The analysis reveal following results: With regard wind prevention and sand-fixation, Headysarum scoparium×Caragana korshinskii×Halloxylon ammondendron windbreak system proves to be the best, while pure Haloxyllon ammondendron forest(6m×9m) is simply the worst. 20 years after the establishment of sand-fixation forests, the intensity of crude sand particles (sand particles between 1.0～0.5mm in diameter) in the forest drops by 66.4%, while fine sand particles (less than 0.25mm) increase from 12.8%to 72.0%. Soil organic matter increases by 30.1%， total soil nitrogen by 48.3%, total soil phosphate by 76.3%, and total soil potassium by 58.0%. Both soil pH and total salt drop. There is a significant positive ecological effect of both sand-fixation forests and windbreaks on Heihe River valley soils in the past 20 years.
Spatio-temporal analysis of nitrogen and phosphorus in farmland water environments of Taihu Lake region
WO Fei, CHEN Xiao-Min, WU Hua-Shan, CHEN Li
2007, 15(6): 30-34.
Abstract(858) PDF(940)
Abstract:
This paper analyzed changes in concentrations of nitrogen and phosphorus in farmland water environments in the Taihu Lake region over typical farming months of March, May and July. Results show high nitrogen and phosphorus pollution in the entire farmland water environment. A worsening trend is observed for the period of March to July. Nitrogen and phosphorus contents in surface water, especially in Taihu Lake, far exceed national eutrophication limits, with an acute pollution degree.Total-phosphorus (TP) and nitrate nitrogen (NO3--N) contents in well waters show obvious increase. As for ammonium nitrogen (NH4+-N), it simply exceeds national type V standard of groundwater quality, very unfit for drinking. A negative linear correlation exists between NH4+-N and clay content in shallow groundwater, and a positive linear correlation between NO-3-N and pH in deep groundwater.The results provide scientific-based decision-making tool for environmental protection and melioration drive of non-point source pollution in Taihu Lake region.
Effect of reclaimed water irrigation on growth and water use efficiency of maize and soybean
HOU Li-Wei, HUANG Zhan-Bin, MIAO Zhan-Xia, LI Yong, WANG Hai-Feng
2007, 15(6): 35-39.
Abstract(942) PDF(1143)
Abstract:
Under the same irrigation management, plant height, leaf area, dry-grain weight and water use efficiency (WUE) always differ due to differences in water quality. Pot experiment was conducted with fresh water(F) as the control treatment to compare the effect of reclaimed water Second-Grade S), Third-Grade (T), and Original-Sewage(O) from Beijing Gaobeidian sewage water treatment plant］irrigation on the growth and WUE of maize (Zea ays L.) and soybean (Phaseolus vulgaris L.). From the results, it is observed that S inhibits maize growth, while T promotes maize growth in the breeding stage. S and T reclaimed water irrigation shows a promotive effect in breeding and flowering stages, while no effect in the harvest stage of soybean. With regard WUE, a set of reclaimed water shows an inhibition effect in maize breeding stage, which gradually changed into a promotive effect after jointing stage. Another set of reclaimed water is observed to have a promotive effect in soybean breeding stage, which also gradually faded out after the flowering stage. In conclusion thus, third-grade reclaimed water (T) irrigation has beneficial effect on the growth and WUE of maize in all growth stages. Second-grade reclaimed water (S) irrigation inhibits growth and WUE of maize in breeding stage, but promotes growth and WUE after the jointing stage. The two grades of reclaimed water irrigation of soybean benefit all growth stages, and not remarkely influence WUE.
Application feasibility of GIS-based neural network model in soil water analysis in the hilly Loess Plateau
HE Xiao-Hui, WEN Zhong-Ming, JIAO Feng, YANG Qin-Ke, LI Rui
2007, 15(6): 40-43.
Abstract(885) PDF(1029)
Abstract:
The main limiting factor of vegetation construction in hilly areas of Loess Plateau is soil moisture.The spatial distribution of soil moisture is influenced by meteorological factors,land-uses and complex topographies,making soil moisture-vegetation relationship pretty complex.This paper utilized data from soil moisture tests in the hilly Loess Plateau of Zhifanggou catchment to build a GIS-based BP neural network model.The model technique includes multiple factor influences on spatial distribution of soil moisture.Field data was used in training the net which then used to forecast soil moisture of the cachment.The forecast result is in good agreement with practical situations,showing the feasibility of GIS-based BP neural network in analyzing soil moisture distribution regulation in highly complex regional topographic terrains.
Soil evaporation in artificially revegetated sandy areas of Hunshandake
WANG Zhi-Qiang, Chaolunbagen, CHAI JianHua
2007, 15(6): 44-47.
Abstract(1454) PDF(1227)
Abstract:
A Micro-Lysimeter based experiment was conducted to determine daily soil evaporation (Es) in the artificial grassland of Hunshandake sandy terrain in crop growing season of 2005, followed by the identification and analysis of the main factors affecting Es. Es BP network forecast models are compared between using six input vector factors (daily mean temperature, net radiation, relative humidity, wind speed at 2m height, soil moisture in 0～30cm soil depth and LAI) and four input vector factors (daily mean temperature, net radiation, soil moisture in 0～30cm soil depth, and LAI). The research results indicate that BP network model is suitable for Es forecasting, and the six and four input vector factors of BP network models are both convenient and feasible in Es forecasting at production levels. The six input vector factor network model is more accurate than the four input vector factor network model. The research provides supplement to traditional Es calculation methods.
Effect of surface soil nitrogen pool on productivity of permeable paddy soil in Taihu Lake region of China
GUO Ru-Li, SHEN Ming-Xing, YANG Lin-Zhang
2007, 15(6): 48-50.
Abstract(1183) PDF(901)
Abstract:
Twenty-four years(1980～2004) field experiment in Taihu Lake region of China has shown that rice yield is significantly influenced by soil nitrogen.No fertilization and application of P,K fertilizers reduce soil nitrogen pool,while the application of fertilizers with N(N fertilizer;N,P fertilizers;N,K fertilizers;N,P,K fertilizers)slowly increases the soil nitrogen pool.Unlike inorganic nitrogen,organic nitrogen incorporation(straw manure)facilitates soil nitrogen pool build-up.In contrast with zero-fertilizer treatment,yield increase rate under NPK and organic fertilizer incorporation treatments is the highest,35.94%.With nitrogen application,the relationship between total surface soil nitrogen and rice yield changes from one of significant to an insignificant level.
Effect of soil fumigation on soil microbe and nitrification
CHENG Xin-Sheng, YANG Jian-Qing
2007, 15(6): 51-53.
Abstract(1545) PDF(1097)
Abstract:
Effect of methyl bromide)68.1g/m2) and methane sodium (7.5mL/m2)on soil microbe population and soil nitrification capacity was investigated in field.Results show no fumigant inhibition on actinomycete population,but some degree of fumigant inhibition on total bacteria population is noted.However,nitrite bacteria population and soil nitrification capacity are strongly inhibited.The number and kinds of soil fungi change significantly after fumigation.Soil microbes recover to normal levels 9 weeks after fumigation.
Crop yield and fertilizer contribution under different fertilization systems
YU Wan-Tai, JIANG Zi-Shao, ZHOU Hua, MA Qiang, SHEN Shan-Min
2007, 15(6): 54-58.
Abstract(1493) PDF(1292)
Abstract:
Based on a 17 years consecutive field trial,the paper explored the effects of different fertilization systems on crop yield and fertilizer contribution to give guidance for application of fertilizers.The results indicate that the application of N,P and K fertilizers can increase crop yiled by 32.10%,15.06%,10.95% respectively.The remarkable residual effect of recycled nutrients from farm manure on stabilizing and increasing crop yield is observed.In the case of optimum fertilization system of application of N,P and K fertilizers with recycled manure,the largest contribution rate of fertilization in the forming of crop yield can reach 0.44.It is concluded that application N,P and K fertilizers with recycled manure is an effective method to keep higher crop yield in low reach of Liaohe River plain.
Effects of application nitrogen on photosynthesis and growth of different drought resistance winter wheat cultivars
ZHANG Xu-Cheng, SHANGGUAN Zhou-Ping
2007, 15(6): 59-64.
Abstract(1277) PDF(975)
Abstract:
The net photosynthetic rate(Pn),stomatal conductance(Gs),stomatal limited value(Ls) and aboveground biomass is at different growth stages of two contrasted drought-resistance cultivars of winter wheat treated by five nitrogen levels were investigated in field experiment.The results show that the net photosynthetic rate decreases as the plant growth,the highest Pn of the CK (no N fertilization) is on the jointing stage and those of other treatments (N fertilization) are on the tillering stage.The highest Gs and Ls of all N treatments are on the jointing stage to heading stage.They first increase and decrease finally as plant growing.Reasonable nitrogen supply can increase Pn and Gs and decrease Ls.The Pn and Gs of different cultivars are different with growth stages and nitrogen fertilizations,the Pn and Gs of dryland cultivar are higher than those of watered cultivar at the N180 treatment,and those of the dryland cultivar are higher than those of watered cultivar from the jointing stage to heading stage.The aboveground biomass increases continuously as the plant growing.The effect of nitrogen supply on the aboveground biomass is different between cultivars,which of dryland cultivar increases firstly and decreases finally as the nitrogen supply increase,and which of the watered cultivar decreases continuously.The grain yield of the two cultivars increases firstly and decreases finally with the nitrogen fertilization increase,the highest grain yield of two cultivars is on N180 treatment,so the N180 treatment is the optimize nitrogen supply level in field.
Effect of base-N to dress-N ratio on water and nitrogen utilization,growth of summer maize in North China Plain.Ⅰ.Growth,development and water use efficiency of summer maize
YI Zhen-Xie, WANG Pu, TAO Hong-Bin, LU Lai-Qing, YU Guo-Jian
2007, 15(6): 65-68.
Abstract(1509) PDF(1088)
Abstract:
Under low N application rate［180 kg(N)/ha］,maize (Zhengdan958) was used to study the effect of base-N to dress-N ratios (RBTD) at 1∶2，1∶1 and 2∶1 on growth,development and water use efficiency (WUE) of summer maize in North China Plain.Results show increased leaf number,plant height and yield of summer maize under N fertilization,and that the increment gets larger with increased dress-N to total-N ratio (RDTT).Base-N has beneficial effects on leaf area expansion,while dress-N has beneficial effects on leaf area maintenance in filling stage.Coarse protein and free amino acid contents in maize grains increase with N fertilization and increased RDTT.The starch content of 1∶2 RBTD treatment increases,while those of the other two treatments drop.WUE heightens with increasing N application,and higher percentages of dress-N are proved to be advantageous to heightened WUE.Because precipitation mainly occurs in the sowing to jointing stage of summer maize in the North China Plain,it is concluded that less base-N application and RBTD ratio of 1∶2 are the best dosage for agronomic and quality traits amelioration,heightening yield and WUE of summer maize.
Effect of nitrogen,phosphorus and potassium stress on root vigor and hydraulic conductance of Astragalus membranaceus seedling
TAN Yong, LIANG Zong-Suo, WANG Wei-Ling, DUAN Qi-Mei
2007, 15(6): 69-72.
Abstract(2006) PDF(1712)
Abstract:
Changes in root vigor, hydraulic conductance,and leaf chlorophyll content under nutritional stress were measured and compared in different hydroponic trial treatments of half-Hoagland nutrition (CK) and half-Hoagland nutrition without nitrogen (-N),phosphorus (-P) and potassium (-K) of referenced Astragalus membranaceus seedlings.When compared with full nutrient (CK) treatment,root vigor,root absorption surface area,root hydraulic conductance and leaf chlorophyll content significantly decrease in treatments without N,P and K elements along with significant difference in root/shoot ratio (R/T) between both the control and element-deficit treatments.Specially,both-N and -P treatments most significantly affect root hydraulic conductance.
Evaluation of the effect of coated urea on rape growth
WANG Xiao-Bo, WANG Yan, ZHANG Yuan, WANG Xiao-Jing
2007, 15(6): 73-76.
Abstract(1569) PDF(1091)
Abstract:
A pot experiment was set up to study the effects of four different coated urea fertilizers on rape growth through appraising their impact on soil urease activity,yield and quality of rape and fertilizer utilization rate.Based on the above mentioned indices,the best treatment (FSU-4) was selected that fully met rape nutrition demand just from single application.Compared with urea treatment,rape biomass raises by 70.8%,Vc content increases by 7.8%,and chlorophyll content increases by 46.1% when treated with FSU-4;while nitrate content drops by 46.0%.In two experiments conducted,fertilizer utilization rate of FSU-4 increases by 36% compared with urea.Suppression of urease activity by coated urea is observed in the early rape growth stage,but subsequently gains vigor in the late stage;an unexplained phenomenon that needs further research.
Effect of application rates of rape seed cake on yield and quality of flue-cured tobacco
FU Li-Bo, SU Fan, CHEN Hua, HONG Li-Fang, YANG Yue
2007, 15(6): 77-80.
Abstract(1338) PDF(1049)
Abstract:
An experiment was conducted to study the effect of application rate of rape seed cake on yield and quality of flue-cured tobacco.The results show that output yield and value of flue-cured tobacco are highest at 25% N from rape seed cake and 75% N from compound fertilizer.However,output yield and value of flue-cured tobacco decrease when N application rate from rape seed cake is above 25% of total applied N.With the same application amount,output yield and value of flue-cured tobacco in rotten rape seed cake treatment are higher than those in unprocessed rape seed cake.It is also observed that fluecured tobacco leaf chemical quality balances well at 25% rotten rape seed cake,plus 75% compound fertilizer treatments.At 100% rape seed cake (rotten or nprocessed rape seed cake) or 100% chemical fertilizer treatment,flue-cured tobacco leaf chemical quality becomes very unbalanced.
Nutrient absorption and yield of rape under coupled application of phosphate rock and sulfur
MENG Ci-Fu, CAO Zhi-Hong, JIANG Pei-Kun, XU Qiu-Fang
2007, 15(6): 81-83.
Abstract(1464) PDF(923)
Abstract:
The results of two field experiments on paddy soil from quaternary red clay treated with phosphate rock(PR) and elemental sulfur(ES) indicate that Gafas phosphate rock (GPR),Kunyang phosphate rock(KPR) and single supper phosphate(SSP) applications respectively increase rape grain yield by 22.2～23.2,13.7～ 13.9 and 21.2 folds as comparison with CK.GPR and KPR mixed with ES enhance the increasing effects of PR on yield.KPR,GPR and SSP application respectively increases P absorption of rape by 6.7,15.8,and 13.8 folds,whereas GPR and KPR mixed with ES increases P absorption by 69.2% and 11.4%.Application of GPR,KPR and SSP or their combination with PR and ES increases available S content in plowed layers,but does not increase available P.
Ammonia volatilization in gleyed paddy field soils of Taihu Lake region
ZHANG Jing, WANG De-Jian
2007, 15(6): 84-87.
Abstract(1406) PDF(1094)
Abstract:
An experiment was conducted under different amounts of fertilizer-N, straw and pig manure to study ammonia volatilization in gleyed paddy soils using continuous airflow method. Ammonia volatilization in 2005 and 2006 are 8.2～ 28.7kg/hm2 and 21.8～62.1kg/hm2 respectively, with NH3 loss to applied fertilizer-N of 3.7％～8.8％ and 10.0％～18.9％, respectively. The highest ammonia volatilization loss occurs at top-dressing at tillering stage,while the lowest loss is at top-dressing at panicle stage. Ammonia volatilization mainly happens within three days after fertilization. Straw accelerates short term urea hydroxylation, but does not significantly increase ammonia volatilization. Pig manure slowly promotes ammonia volatilization,but increases ammonia volatilization. A strong correlation exists between ammonia volatilization and NH4+-N concentration in surface water.
Effect of EM compost on soil organisms
YANG Wen-Rui, LI Wei-Jiong, CHEN Zhan
2007, 15(6): 88-91.
Abstract(1560) PDF(1209)
Abstract:
An experiment on winter wheat and summer maize with different fertilizer treatments was conducted to study the effect of Effective Microorganism(EM)compost on soil organisms.The results show that EM compost increases soil bacteria,fungi,and actinomycete counts.Total number of microbe of EM compost is highest among all the treatments with the same organic matter application.Meanwhile,EM compost enhances microbial activity and density.In EM compost plots,soil earthworm counts are significantly higher than in all other plots.Equally,the average soil mite counts in EM compost plots are higher than those in all other plots,but the count difference gets insignificant with the same levels of organic matter input.In most of the growth periods,an obvious difference of soil organism amount exists between EM compost treatment(15t/hm2) and chemical fertilizer treatment or CK treatment.EM compost improves soil productivity.
Comparison of determination methods of organic matter content of organic inorganic compound fertilizers
ZHOU Jun, CAI Huan-Xing, WANG Xiao-Gang
2007, 15(6): 92-95.
Abstract(1498) PDF(1073)
Abstract:
Dilution-heating method,boiling bath method and oil bath method were used to determine organic matter content of organic-inorganic compound fertilizers,and the precision and accuracy of the three methods compared.The relative standard deviation(RSD)and recovery rate of both boiling bath method and oil bath method are within acceptable range.However,dilution-heating method RSD is 0.55%～6.24%，and enhances with increase of organic matter content in organic-inorganic compound fertilizer.And in some organic-inorganic compound fertilizer samples,the dilution-heating method recovery rate is beyond 100%±5%.Thus in comparison with the boiling bath and oil bath methods,stability and veracity of the dilution-heating method are relatively lower.Adjusted oxidation coefficient of measured organic matter contents of organic inorganic compound fertilizers under dilution-heating,boiling bath method and oil bath method is 1.63，1.49，1.24 respectively;much higher than that of measured organic matter content of soil.
Comprehensive evaluation of flowering-podding period drought resistance of soybean
LI Gui-Quan, LI HuiFeng, ZHANG Hai-Yan, WU Shen-Jie, DU Wei-Jun, GUO Shu-Jin, LI Ling, JIAO Bi-Chan
2007, 15(6): 96-100.
Abstract(1442) PDF(1206)
Abstract:
Ten different ecotypes of soybean varieties were selected based on the degree of drought resistance.Some physiological and biochemical indexes related to drought resistance including relative conductivity,photosynthetic rate,relative water content,etc.were measured by way of pot and field experiments.Grey system theory was used to determine the relationship between indexes and drought resistance.Then by applying grey correlative degree,comprehensive multiple target evaluation and drought resistance index as parameters,every identified index was assigned an absolute value to quantitatively evaluate soybean drought-resistance in floweringpodding period.Results show the relative degrees of “Jinda 74”,“Jinda 53”,“Jinda 75”with the reference variety to be,respectively,0.8706,0.7278 and 0.5513.“Jinda 74”has the highest drought resistance,followed by“Jinda 53”,while “Jinda75” is simply the weakest.In accordance with drought resistant index theory and grey correlative degree of comprehensive multiple target evaluation,drought resistance of“Jinda 74”and“ Jinda 53”are the best,which well correspond with practical situations.Correlation coefficient of the two drought resistance appraisal methods of soybean is 0.8061**,which explains the reliability of grey correlative degree in the use of comprehensive multiple target evaluation to evaluate soybean drought resistance in flowering podding period.
Effects of plant growth regulators on Tagetes erecta L.seedling growth
ZHANG Jian, ZHANG Zhi-Guo, SUI Yan-Hui
2007, 15(6): 101-103.
Abstract(1467) PDF(1184)
Abstract:
Plug seedlings of marigold(Tagetes erecta L.) were treated through foliage spraying with different concentrations of plant growth regulators(PGR)—daminozide(B9),chlormequat(CCC),and paclobutrazol(PP333).The study shows that the optimal concentrations of B9,CCC and PP333 for marigold seedling growth regulation are 2500mg/kg,0.3%,and 60mg/kg and the effective and safe concentration ranks of the three PGRs are 1000～2500mg/kg,0.1%～0.3% and 10～60mg/kg,respectively.Among the three optimal alternatives,60mg/kg PP333proves best with lowest cost followed by 0.3% CCC.When CCC concentration gets beyond 1.0%,plant phytotoxicity occurs.
Regulating effect of MeJA and MeJA + BA on spikelet opening of parents of Indica hybrid rice
CHEN Xiao-Rong, ZHONG Lei, ZENG Xiao-Chun
2007, 15(6): 104-107.
Abstract(1214) PDF(1373)
Abstract:
Parents of Indica hybrid rice,“TeA”,“Peiai64S” and “9311”,were sprayed with MeJA(methyl jasmonate) and MeJA+BA(6-benzyl adenine) before spikelet opening,with natural water as the control treatment and response of the rice to the treatments analyzed.MeJA and MeJA+BA significantly improve spikelet opening time and concentration degree,and shorten opening duration of “TeA”and “Peiai64S”.MeJA and MeJA+BA also has some effects on “9311”spikelet opening time and duration.Both MeJA and MeJA+BA have similar tendencies in effect on opening time and duration.MeJA decreases spikelet opening angle and the distance between opened spiklet tips of the three parent hybrids while MeJA+BA slightly increases such effects on the above arameters.On the whole,MeJA and MeJA+BA have no significant effects on plant height,flag leaf length,and exposed panicle length of the three parent rice.
Extraction of corn-bract flavonoid and related antioxidative activity
ZHAN Ping, TIAN Hong-Lei, LI Kai-Xiong
2007, 15(6): 108-112.
Abstract(1205) PDF(1283)
Abstract:
The craft of corn-bract flavonoid extraction with ultrasonic and its content measurement with colorimetry was conducted and the best distillation conditions found to be at 700W of ultrasonic power,extraction temperature of 60℃，material proportion of 50g/mL,ethanol concentration of 60%,extraction time of 35 min.The highest total flavonoid rate gets 1.225%.Antioxidative test results show good performance of flavonoid scavenging capacity in both superoxide radical systems and hydroxyl radical systems.Free radical scavenging capacity, IC50 flavonoids, to superoxide radical system and hydroxyl radical are respectively 1.5μg/mL and 0.14mg/mL and stronger than vitamin C(VC).In DPPH system,IC50 flavonoid is 0.2mg/mL and IC50 VC is 0.075mg/mL.However,within selected dosage,the highest scavenging capacity of flavonoids outweighs that of VC.The tests show the suitability of flavonoid as good natural radical scavenger.
Effects of pesticides on soil phosphatase activity and respiration of soil microorganisms in loquat orchard
FU Li-Jun, YANG Wen-Jin
2007, 15(6): 113-116.
Abstract(1341) PDF(1068)
Abstract:
The effects of 4 pesticides (thiophanate-methyl,mancozeb,fenvalerate and abamectin)on soil phosphatase activity and respiration of soil microorganisms were investigated in this study.Safety levels of the four pesticides were also evaluated.Results show an irrecoverable inhibition of phosphatase activity in soils treated with thiophanate-methyl or mancozeb.Phosphatase activity of fenvalerate or abamectin treated soils are initially inhibited,but then reactivated after 7 days and hitting peak values 35 days after treatment.Reactivation gets stronger with higher concentration of fenvalerate and lower concentration of abamectin.Soil respiration is slightly stimulated during the initial period,inhibited after 5 days,and then recovers to control levels after 12 days.Safety evaluation shows that the four pesticides are slightly,but not practically, harmful to soil microorganisms due to their inherent toxicity.
Study on toxicity effects of terbium on horseradish
LIU Su-Jing, WU Xun, ZHOU Qing
2007, 15(6): 117-119.
Abstract(1318) PDF(1059)
Abstract:
Toxicity effects of terbium on horseradish growth were studied.The results show that the chlorophyll can be induced at the low concentration of Tb3+, and destroyed as the increasing of Tb3+ concentration. Tb3+ can induce rise of the activity of horseradish peroxidase(HRP) at lower concentration,and decrease at high concentration.However,the permeability and MDA content appear first decrease and then increase trend.When the concentration is 3mg/kg,all the indexes reach the maximum or minimum;for horseradish,the threshold limit is about 10mg/kg.By the analysis of significance of the index difference,HRP is most sensitive to Tb3+，indicating that the peroxidase may be regarded as the good index of the heavy rare earth toxicity.
Contribution of effluent from medical institutions to municipal waste water mercury
LAN Ru, LIN Hai, KE Zhen-Shan, JIAN Xiao-Dong, LI Jian-Bo
2007, 15(6): 120-122.
Abstract(1017) PDF(970)
Abstract:
Twenty-eight hospitals were selected from a total of 113(using standard sampling procedures)that contribute effluent to Gaobeidian sewage treatment plant in Beijing.The density and total amount of mercury(Hg) in the drainage systems of sampled hospitals were analyzed for Hg sources flowing into the Gaobeidian sewage treatment plant.Meanwhile released Hg amount by hospital,bed number and clinic number was analyzed and correlated.The results show high Hg densities in drainage systems from sampled hospitals.An empirical relationship exists between released Hg amount(Y)from hospital,bed number(X1),and clinic number(X2):Y=3.11X1+0.098X2 +166.94.Total Hg amount released from the hospitals into the Gaobeidian sewage treatment plant area is 99.6g/d,and total Hg amount that enters into the Gaobeidian sewage treatment plant is 828.0g/d.Thus the addition percentage of Hg entering into the sewage treatment plant from hospitals is 12.02%，meaning that the hospitals are not major Hg source of the plant.
Comparison of photosynthetic physiological and anatomical features of gene and virus controlled silver-leaf mottling of summer squash
ZHANG Zhan-Bei, ZHANG Hui-Jie, DUAN Guo-Qi, JING Xiu-Wen, CHEN Zhao-Hui
2007, 15(6): 123-125.
Abstract(862) PDF(1449)
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Photosynthetic physiology of silver-leaf mottling of summer squash caused by gene and virus(silver-leaf lesion) was measured.In comparison with normal green leaves at different times in the day,a decrease in net photosynthetic rate(Pn),stomatal conductance(Gs) and transpiration rate(Tr) of both forms of leaf-mottling occurs.Though Pn,Gs and Tr fluctuation urves(for the two forms of leaf-mottling) at different times in the day are dissimilar,their absolute values are actually quite close,with no significant difference(P＞0.05).No obvious difference in intercellar CO2 concentration(Ci) for the silver leaf-mottling types is observed,and the absolute values of stomatal limiting trends are about the same.Though gene controlled silver-leaf mottling stomatal limited value(Ls) is a little higher than that of the virus controlled silver-leaf mottling,it is, however, insignificant(P＞0.05).Chlorophyll a,b and total chlorophyll content of both forms of silver-leaf mottling drops.Total chlorophyll content for the gene and virus(silver-leaf lesion) controlled silver-leaf mottling drops by 8.54% and 10.84% respectively,compared with that of green leaves.From close observation of the anatomical features of the two types of silver-leaf mottling,it is found that the upper epidermis shape and rrangement patterns of the leaves are similar,both having a little gap between the upper epidermis and the palisade cells,and the upper epidermis cells change from flat,dense arrangement to globular,thin and scattered arrangement.Based on the above mentioned results,genetic silver-leaf mottling is postulated to be a probable phytotoxic source of silver-leaves,induced by Bemisig argentifolii.
Genetic diversity analyse of Thailand Babylonia areolata with RAPD markers
HUANG Hai, WANG Yong-Qiang, YIN Shao-Wu, LEI Cong-Gai, FENG Yong-Qin, CHEN Guo-Hua, ZHANG Ben
2007, 15(6): 126-130.
Abstract(1070) PDF(792)
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Random Amplified Polymorphic DNA(RAPD)technique was applied to detect DNA polymorphism in 20 individuals of an artificially grown population of Babylonia areolata imported from Thailand.21 random primers were used from which a total of 222 bands were generated.Each primer used in the detection has 4～16 bands,with DNA fragment lengths ranging from 200 to 2200bp.Observed total amount and percentage of the polymorphic fragments are 156 and70.27%,and the Shannon and Nei index of phenotypic and gene diversity of raised population are 0.2818 and 0.2491 respectively.Genetic distance among individuals ranges from 0.066 to 0.291.Comparing genetic diversity of B.areolata with that of other shellfish reveals a hefty genetic diversity of B.areolata.
Spatial distribution measurement of leaf area index in flux contributing source of eddy covariance flux tower
LI Zheng-Quan, YU Gui-Rui, ZHAO Feng-Hua, FU Yu-Ling, LI Ying-Nian
2007, 15(6): 131-134.
Abstract(1184) PDF(1090)
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Cyclic sampling design was used to investigate leaf area index(LAI) in flux contributing source of eddy covariance flux tower swamp ecosystems of Haibei.Depending on measured values of LAI and geographical information of GPS sample positions,spatial distribution map of LAI in flux contributing source was mapped out using spatial interpolation method.A new method of measuring leaf area based on digital photography and geographic information system technology was advanced.It is a quick and high-precision method,well adaptable to a diversity of vegetation leaf.In the GRID environment of ArcGIS,original format of digital image of the leaf was transformed and the leaf image resolution made finer by using re-sampling functions.Leaf area was then extracted from the digital leaf image using self-ordained chroma diagnosis program in arc -macro language(AML).The results suggest that leaf area values computed by the method match well with measured leaf areas by instrumental methods(LI-3000A),as their linear regression determination coefficient (R2)turn out to be 0.98.It demonstrates that the accuracy of leaf area measurement by the method meets practical leaf area measurement requirements.
Assessment of ecological safety under different scales based on ecological tension index
ZHAO Xian-Gui, MA Cai-Hong, GAO Li-Feng, WEI Liang-Huan
2007, 15(6): 135-138.
Abstract(1738) PDF(1430)
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Based on the principle of ecological footprint,the paper advanced ecological tension index as an evaluation method of ecological safety,and set out ecological safety classification criteria.Ecological tension index and classification criteria were used to evaluate ecological safety of 147 countries in the world and some provinces,cities and counties of China.Results of the study show that used index and criteria reliably assess ecological safety in both space and time.
Ecological footprint and ecological safety of Weinan City of China
XIAO Ling, ZHAO Xian-Gui, YANG Bing-Can
2007, 15(6): 139-142.
Abstract(1375) PDF(1260)
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A quantitative study was undertaken to examine ecological footprint and ecological safety of Weinan City of Shaanxi Province,China,from 1985 to 2003.Per capita ecological footprint of Weinan gradually increases from 1.3792hm2 in 1985 to 2.3516hm2 in 2003.Per capita ecological capacity is between 0.4726hm2 and 0.5917hm2.An increase in per capita ecological deficit is noted from 0.8423hm2 in 1985 to 1.8291hm2 in 2003.Ecological tension index increases from 0.82 in 1985 to 1.29 in 2003.Ecological occupancy index increases from 0.63 to 1.08 over the same period with an ecological economic coordination index range of 0.58～0.88.Results show the current development model of Weinan to be unsustainable with ecological environment being at risk.Also,socio-economic development does not match ecological capacity.
Ecological footprint for sustainable development of Chongqing City
ZHENG Qin-Yu, HE Zai-Chao
2007, 15(6): 143-147.
Abstract(1428) PDF(966)
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Based on demand and supply balance analysis,an ecological footprint(EF) model of Chongqing City was established.The results show per capita EF deficit to be 1.2806 hm2 in 2004,meaning that eco-economic system demand from human activities exceeds the region's natural system supply limit.The structure and function of the regional eco-economic system needs urgent readjustment as it already proves to be strongly asymmetric.Human consumption exhibits a simplex trend in ecological space.There is an intensification of relationship between the human element and the land element of the ecosystem.
Evaluation method of regional forest landscape carrying capacity—A case study of Wuyuan County,Jiangxi Province
OUYANG Xun-Zhi, LIAO Wei-Ming
2007, 15(6): 148-151.
Abstract(1383) PDF(1071)
Abstract:
Based on the connotation and characteristics of forest landscape resource carrying capacity,a carrying index(ratio of carrying quantity to carrying capacity) method was postulated to evaluate the carrying capacity of forest landscape resources.An evaluation index system involving 15 indices of economy,ecology and recreation, was set up by means of theoretical analysis and expert best-judgment method,to establish a carrying index calculation model for forest landscape resources.The carrying capacity of forest landscape resources of Wuyuan County,Jiangxi Province was evaluated based on the above established method.Index weight was determined by analytic hierarchy rocess,and the calculation method of the indices was explicited.The overall carrying index of the forest landscape resources as calculated by the evaluation method is 0.3559,indicating that the forest landscape resources are in a state of weak loading.Ecological and recreational carrying indexes are 0.2308 and 0.2448 respectively,revealing a weaker state of loading. However, economic carrying capacity is about saturated,as reflected in the carrying index value of 0.9710.The results indicate that decreasing economic demand on forest landscape resources is a key factor to improve the overall forest landscape resources carrying capacity.A main approach achieving this goal is by decreasing energy consumption and enhancing fruit forest cultivation.
Health assessment index system of Hongze Lake wetland ecosystem
WANG Zhi-Liang, WANG Guo-Xiang
2007, 15(6): 152-155.
Abstract(1164) PDF(1225)
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Following a comprehensive review of the progress of ecosystem health oncept,the paper focused on the analysis of the indexing system of wetland ecosystem health assessments and shortfalls,taking Hongze Lake as studied area.Accordingly,PSR model and AHP method were used to map out an indexing system of wetland ecosystem assessment in the Hongze Lake region,a 3-tiered system,with a total of 30 indices,including biophysical,socioeconomic and human-health components.
Integrated crop,fruit and pasture system and its eco-economic benefits in Southwest China karst terrain—A case study of Longhe Village，Guohua Town,Pingguo County,Guangxi Zhuang Autonomous Region
HUANG Yu-Qing, HE Cheng-Xin, WANG Xiao-Ying, LI Xian-Kun, LU Shu-Hua
2007, 15(6): 156-160.
Abstract(1351) PDF(1302)
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This paper established an effective eco-agricultural system through eco-function transformation designing.In the system,the mountain tops are cultivated with closed fine tree species,the middle part of the slopes is rotation cropping subsystem of fruit/pasture and/or fruit/herb,the lower and bottom parts of the slopes is a crop-pasture rotation subsystem,and the courtyards of farm households is a closed animal husbandry.A water-saving model of crop-fruit-pasture is established based on water storage and ducting net.A series of techniques are introduced,including integration of fruit-pasture＼herb,manure and straw compost,pasture establishment and management,water resource exploitation and watersaving irrigation,and so on.Livestock forms the center of the system,which transforms the crop grain and pasture into manure that in turn enriches soils planted with crops,fruit and pasture,and accelerates material and energy cycling,thereby improves utilization efficiency of the natural resources.
Integral landscape pattern of gneiss area of Taihang Mountain
ZHANG Jin-Zhu, XU Xue-Hua, YANG Yan-Po, ZHANG Hui
2007, 15(6): 161-164.
Abstract(1342) PDF(1122)
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Spatial patterns and structural characteristics of integral landscape of Fugangshanzhuang Village of gneiss area of Taihang Mountain were analyzed.Main landscape patterns of the area include soil and water conservation forest,Castanea mollissima forest and Malus pumila forest,accounting for 75.23% of the total area and mostly occurring in the middle and upper zones of the mountain slopes.Their control capacity on integral landscape structure and function outweighs other landscape types due to large coverage area,perimeter,dominance index and low fragmentation index.Other landscape types are heavy fragmentation distribution,widely scattered,and form a integral landscape pattern with dominant landscape types.The results indicate a rational spatial pattern of landscape in Fugangshanzhuang Village with beneficial effects on biodiversity conservation,environmental stability and sustainable of natural resource utilization.
Spatio-temporal characteristics and driving force of land-use change in Beijing's ecological environs—A case study of Weichang County，Hebei Province
GAN Chao-Hua, MA Li, NAN Qiu-Ju
2007, 15(6): 165-170.
Abstract(1466) PDF(1080)
Abstract:
Ecological environs of Beijing have witnessed rapid development,desertification and land degradation in the last decade and post a major threat to Beijing-Tianjin eco-region.Taking Weichang County of Hebei Province as a case,the paper illustrated spatial-temporal characteristics of land-use change by construction of mathematical index and analysis of social policy effects on land-use change and industrial structure adjustment under ecological construction.The results show great change in land resource from 1992 to 1998 with a gradual reduction in cultivated land.However,from 1998 to 2002,the changes in land resource are gradual,while cultivated land decreases sharply with rapid increase in orchard lands.From 1992 to 1998,the main changes in land-use type are from grassland and uncultivated land to forest land;while from 1998 to 2002,with the exception of the changes above,transformation from cultivated land to forest land increases markedly.Diversity in land-use tends decreases as well.Human effect driven by national ecological construction policy is the rationale behind land-use changes in Weichang County.Agricultural structural adjustment,especially the return from cultivated lands to forestlands or,in recent years,to grasslands is the reason for the decrease in cultivated lands.
Changes in wetland landscape in Dongting Lake area
LIANG Shou-Zhen, LI Ren-Dong, XU Guo-Peng
2007, 15(6): 171-174.
Abstract(1746) PDF(1413)
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Dongting Lake wetland is one of the most important wetland systems in China,consisting of rivers,lakes,paddy fields,bottomlands,swamps,reservoirs and ponds with high levels of complexity and diversity in function and value.Based on GIS technique and Landsat images for three distinct periods,1980,1990 and 2000,the wetland landscape changes in Dongting Lake area were analyzed.Results show that overall decrease in the wetland area,with specific increases in artificial wetlands and decreases in natural wetlands.Lake area decrease is the highest in all natural wetlands,and mutual conversions among the wetland systems exist.The change reveals the outcome of man,s interactions with nature,the effect of man on wetlands being the most important factor of change.Degradation of environmental quality and ecological function in Dongting Lake area is attributed to changes in the wetland landscapes.
Analysis on the competitive power of eco-environments of some provinces and regions in China
LU Jin-Ping, ZHENG Li
2007, 15(6): 175-178.
Abstract(1180) PDF(996)
Abstract:
Based on extensive data,utilizing multi-level component analysis method,setting up eco-environment competitive power evaluation factor framework,the text analyzes completly the eco-environment competitive power of some provinces and regions of the country.The results can be used as scientific base for policy regulations on ecology construction and environment protection.
Characteristics of eco-agriculture patterns and execution approaches
ZHANG Wei-Dong, WANG Xue-Feng
2007, 15(6): 179-181.
Abstract(1356) PDF(1468)
Abstract:
This article generalized environmental problems induced by agro-intensivism,such as water and soil dry-up and erosion,environment pollution,etc.The characteristics,strengths and weaknesses of eco-agriculture were thoroughly discussed,and three best eco-agriculture patterns and success scenarios in China were put forward.The three best eco-agriculture patterns include:(1) the circulating and multi-polar mode based on food chain theory;(2)the spatial-temporal succession and rational configuration mode based on community succession theory;(3)the system regulation mode based on ecoeconomic theory.It is concluded that agricultural standardization is the transformation key from agro-intensivism to eco-agriculture pattern.The paper introduces standardization strategies of agricultural project,methods and approaches of execution of agricultural standardization,and eco-agricultural standardization application scenarios of three-dimensional cropland,mountain region,and orchard modes.
Models and strategies of ecological city construction
LU Min, WANG Ren-Qing, LI Ying-Jie
2007, 15(6): 182-184.
Abstract(1555) PDF(1592)
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Ecological city is man's ideal residence model in the new century.The paper summarized five main models of ecological city.The models include circulating economic ecological city,political ecological city,complex economic ecological city,ecological resource ecological city and seashore ecological city.Finally,strategies and basic contents and measures of ecological city construction are advanced.
Evaluation of the role of microorganisms in composting
NIU Jun-Ling, GAO Jun-Xia, LI Yan-Ming, LI Guo-Xue
2007, 15(6): 185-189.
Abstract(850) PDF(1231)
Abstract:
Composting is a dynamic and delicately coordinated process of rapid successive actions of a number of microbial colonies.Through analysis of large volumes of information and field research,this article introduced the development and research setbacks in microorganismic composting process.The succession of microbial community,selection and application of organic material microorganismic biodegradation and application of denaturing gradient gel electrophoresis (DGGE) were used to study microbes in composting.The main restricting factors were experimentation method and complexity of microbial colonies.It is concluded that emphasis should be placed on the utilization of molecular biological methods in studying composting,and also on highly efficient,complex and stable microbial communities to degrade more than one kind organic aterial.Microbial community should be selected and constructed based on relationships among microbes to enhance adaptability to the complex conditions of composting in order to attain community dominance.
Effects of different wall materials on the performance of heat preservation of wall of sunlight greenhouse
LI Xiao-Fang, CHEN Qing-Yun
2007, 15(6): 185-189.
Abstract(1586) PDF(1161)
Abstract:
The performance of heat preservation of wall was simulated and analyzed by the method of heat response factor and the model of thermal environment of sunlight greenhouse.The effects of heat preservation of different wall materials were compared through measuring the heat gained,temperature of wall and inner air temperature of greenhouse.The results show that the best thickness of polystyrene foam plastic among all the treatments is 0.10m;the effect of heat preservation of the thinner brick is better than that of the thicker brick with the same thick polystyrene foam plastic;if the brick is thinner,the arrangement of materials plays an important role in the performance of heat preservation of wall.
Analysis of the factors affecting soil nitrogen loss through runoff
YANG Li-Xia, YANG Gui-Shan, YUAN Shao-Feng, LI Heng-Peng
2007, 15(6): 190-194.
Abstract(1815) PDF(1584)
Abstract:
This paper systematically analyzed the impacts of landform,rainfall,soil,vegetation,fertilizer and cropping system on soil nitrogen loss and introduced the latest achievements of research in this field.Based on complex interactions of the above factors,suggestions on future research on soil nitrogen loss are advanced.Firstly,experiments on multi-factor interactions and quantitative evaluation of their relationships should be done to provide scientific understanding of the basic mechanisms of soil nitrogen loss and non-point source pollution model parameters.Secondly,cooperation among various research disciplines should be enacted to establish profound theoretical basis.Thirdly,large-scale models on soil nitrogen loss should be established by conduction on field experiments and micro-runoff plots in combination with remote sensing and GIS to provide support for environmental macroscopical decision on spatial-temporal scales.
Development and application of immunoassay in pesticide residue analysis
WANG Wen-Jun, LIU Xing-Chun, LI Ji
2007, 15(6): 195-199.
Abstract(1333) PDF(1584)
Abstract:
This article reviews technical development of antibody and antigen preparation and application methods of a handful of major immunoassay (radioimmunoassay,enzyme immunoassay,fluorescence immunoassay,chemiluminescence immunoassay,etc.)in the analysis of pesticide residues.With special emphasis on new formats developed in recent years,including coupled immunoassay and chromatography technique,a new tendency of trace analyses is introduced in detail.Underlying problems in the application of immunoassay are highlighted and future trends of immunoassay development postulated.
Interaction between exogenous Bt gene and secondary metabolites of crop
ZHONG Zhen-Mei, HUANG Qin-Lou, WANG Jian-Wu, LUO Shi-Ming
2007, 15(6): 200-203.
Abstract(1471) PDF(1689)
Abstract:
With the advent of transgenic plant,exogenous Bt gene utilization has offered effective opportunities for developing new series resistant crop varieties.The presence of foreign genes in transgenic plants causes physiological changes in the plants including changes of secondary metabolism,and these changes could lead to ecological effects on the environment.A train of recent research on secondary metabolite and Bt protein interactions were reviewed in this paper.The results indicate that exogenous genes rebuilding affects secondary metabolism of crops.
Effects of silicon on cucumber seed germination and seedling growth under salt stress
HOU Yu-Hui, HAN Xiao-Ri, YANG Jia-Jia, WANG Jing
2007, 15(6): 206-207.
Abstract(1204) PDF(906)
Abstract:
Effect of different water and NO3-N/NH4-N ratios on yield and nitrate cotentent of amaranth
GUO Li-Na, LIU Xiu-Zhen, ZHAO Xing-Jie
2007, 15(6): 208-209.
Abstract(1406) PDF(1019)
Abstract:

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