1998 Vol. 6, No. 1

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1998, 6(1): 1-6.
Abstract(650) PDF(2)
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1998, 6(1): 7-10.
Abstract(732) PDF(693)
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1998, 6(1): 11-13.
Abstract(782) PDF(845)
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An approach to agricultural eco-engineering
Zhang Renwu, Ji Wenying, Han Yuzhen
1998, 6(1): 14-19.
Abstract(1000) PDF(904)
Abstract:
On the basis of analysis on many year’s experience in construction of eco-agrieulture and agricultural eco-englneering in China，the concept of eco-agriculture and agrieulture eco-engineering，its occurrence and development．some related theoties age discussed．The fetures of the Chinese agricultural eco-engineering and the difference between the Chinese eco-engineering and that of the western world are summarized.
A Study on photosynthesis rate and water use eficiency of Chinese sorghum culttvars with different drought-resistant specialities
Wang Yuguo, He Runxi, Miao Guoyan
1998, 6(1): 20-22.
Abstract(1037) PDF(911)
Abstract:
Two Chinese sorghum cultivars with different drought-resistant specialities are　tested to study the diurnal changes of photosynthesis rate and water use efficiency．The results show that the leave water potential，stomata1 resistance，photosynthesis rate and water use efficiency are higher in 3197B eultivar．And the transpiration rate in 3197B cuhivar is　lower than that in San-Chi-San cuhivar．This provides the background information for crop hreeding and cultivation in arid area．
Corrlation between yield-related factors of two hybrid strain of rice and their response tosowing dates
Xie Rong, He Guanghua, Zuo Yongshu, Yang Zhenglin, Li Daorong
1998, 6(1): 23-27.
Abstract(883) PDF(982)
Abstract:
Analysis on data of yield and its related factors from two hybrid strains of rice with different sowing dates showed that there was a very significant and positive correlation between grain weight per plant and panicles per plant，spikelets per panicle，seed setting per-centage and 1000 kernel weight．Among those yield-related factors，seed setting percentage produced a strongest effect on grain weight per plant．The effects of sowing dates on phenotype value of grain weight per plant，seed setting rate and path coefficients of seed setting rate were more efective than those on partial correlation coefficients between grain weightper plant and panicles per plaht, total spikelets per panicle and seed setting rate．
Differentiation in contents of major mineral elements of soybeans from different regions in China
Dong Muxin
1998, 6(1): 28-31.
Abstract(861) PDF(660)
Abstract:
Contents of major mineral elements(P，K，Ca，Mg，Fe，Mn，Zn，Cu．B)in 90 soybean cultivars from different regions in China are analyzed．The results suggested that the contents of some elements changed from place to place and tended to follow some regulalions．Ca in the Huanghe-Huaihe-Haihe Plain held the highest content in the country．The contents of Zn and P decreased from south to north．On the other hand,the content of B in north part was higher than that in the sooth．The content of elements generally followed the pattern of K> P>Ca> Mg> Fe>Zn> Mn> B>Cu．The content of Zn was positively corre-lated with those of P，Fe，Mg and negatively correlated with those of K ，Ca．B both in very significant leve1．The content of Mg was positively correlated with that of Mn in a significant leve1．The content of B Was significantly correlated with that of Ca in a positive way and with those of Zn and B in a negative way．
Studies on temporal and spatial niches of cotton aphid,cotton bollworm and their predatory enemies
Li Shengcai, Dong Wenxia, Li Yu, Yang Futian
1998, 6(1): 32-35.
Abstract(1010) PDF(865)
Abstract:
According to the study on the temporal niche，spatial niche and two-dimensional niche in time and space of the six predatory enemies of cotton aphid (Aphis gossypii Glover)and cotton bollworm (Heliothis armigera Huhner)，the temporal dynamics and role of these two pests played in the insect community were analyzed． The fo1]owing up dynamics of predatory enemies and their impacts on these pests were evaluated．The results showed that insect pests could not be controlled if only by natural contro1． Therefore,IPM must be carried out．
Cotton adaptable cultivation technique in semi-humid and drought-prone areas of south Hebei province
Lin Yongzeng, Li Miao, Zhao Zhanjun
1998, 6(1): 36-39.
Abstract(921) PDF(697)
Abstract:
The high yield cultivation techniques are applied，such as irrigation before sowing，plastic film cover，total fertilizing at sowing and pruning in time which fit the climatic conditions in the semi-humid and drought-prone regions,and can aviod the fertilizer loss caused by drought or heavy rain during the growth period of cotton，resulted in increase of N utilization rate by 5．56%～9．52%．
Effects of Zn,B,Mn fertilizers on yield and quality of corn
Guo Xiao
1998, 6(1): 40-42.
Abstract(840) PDF(865)
Abstract:
Experimen was conducted to test the effects of defferent concentrations of Zn,Mn and Bfertilizers on corn. The results showed that all those applications could improe the quality of corn and straws as forage,and increase the output value both from biological and economical points of view.
Study on eco-agricultural model in coastal sandy land
Zhang Dinghua, Lin Qing
1998, 6(1): 43-47.
Abstract(856) PDF(811)
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The characteristics of ecological environment on coastal sandy land ale investigated．Bases on the analysis of advantageous factors and limitations，different eco-agzieultural models are developed，After four year’s experiment,four models with good ecological，eco-nomic and social benefits are selected．
Benefit analysis and comprehensive evaluation of rice-fish-duck symbiotic mode1
Zheng Yonghua, Deng Guobin
1998, 6(1): 48-51.
Abstract(1375) PDF(894)
Abstract:
Three years’study demonstrated that rice-fish-duck symbiotic model can improve rice production by over 10%，meanwhile produce more than 1036．5kg／hm2 of fish and 238．9～489．3kg／hm2 of adult duck．Total N,P,K and soil organic matter contents of paddy field are increased by 27．9%，44．3%,6．5% and 28．2% respectively．The number of insect pests is decreased ．The symbiotic system largely increased the output and economic benefit．An ecological index (EI)of 0．8155 suggested that it was a high efficient and comprehensive eco-agriculture mode1．
The role of agro-forestry-animal husbandry ecoeconomic system in agricultural sustainable development
Wang Qiujie, Zhang Fusuo, Cai Cong
1998, 6(1): 52-56.
Abstract(858) PDF(924)
Abstract:
The concept and connotation of agro-forestry-animal husbandry ecoeconomic system (AFA) are discussed．Taken AFA in Kaifeng Sandy Soil Experimental Station as an example，the feasibility for promoting agriculture，forest and animal husbandry and obtaining ecological，economical and social benefits in the same time is put forward．The important role of AFA isfigured out．
Agro-forestry ecosystem and sustainable development of agriculture in Karst regious-Taking Zerong Village of Xingyi City of Guizhou Province as an example
Cai Qiu, Lu Lan
1998, 6(1): 57-59.
Abstract(1204) PDF(906)
Abstract:
The features of agricultural ecological conditions in Karst regions in Guizhou Province．the structure and function and the eeologieal，economical and social benefits of the integrated agro-forestry ecosystem in Zerong Village are analyzed．The results demonstrate theoretically that the integrated agro-forestry ecosystem is an effective way to develop sustainable agriculture and to improve people’s living condition．
An analysis on the genesis of debris flow in Taihang Mountains and ecological prevention countermeasure--Taking genesis of debris flow in Hebei Province in 1996 as an example
Wang Zhenliang, Mao Xianghong, Sun Jiding, Zhang JinXiang, Gu Xinqing
1998, 6(1): 60-63.
Abstract(1318) PDF(989)
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Taking debris flow in Hebei province in 1996 as an example，the factors resulting in debris flow in Taihang Moumtains are pointed out．It was summarized that,developing foreat and pLanting grass，constructing water conservancy installations and developing eco-agriculture are main ways to develop mountainous economy safely．
Crop production system and its management system
Dong Zhanshan
1998, 6(1): 64-68.
Abstract(866) PDF(797)
Abstract:
The definition，properties，structure and components of crop production system and the definition of crop production management system are explained．It was pointed out that crop production management system (CROPMAN) was an overlapping science of computer science，agricultural sciences and automation science,and its essential principles consist of crop simulation,crop management expert system and models for optimizing cultural measurements．The further development of CROPMAN would lead to high automation management of crop production．It was needed to integrate Geographic Information System，GlobalPositioning System，Remote Sensing，crop simulation and knowledge engineering into CROPMAN．
Present situmtion,problems and countermeasures of Chinese flowering industry
Xu Yuhong
1998, 6(1): 69-72.
Abstract(823) PDF(1199)
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The present situation and the trend of scientific research．production and trade in flowering industry both in China and abroad are analyzed． The problems and countermeasures in the development of Chinese flowering industry are pointed out．
Eco-engiaeering for utillzation of Chinese agricultural organic waste
Qi Xinying
1998, 6(1): 73-76.
Abstract(1331) PDF(1020)
Abstract:
The status and standard of the utilization of agricultural organic wastes in China are expounded．The principle eco-engineering techniques such as utilization of crop straws，livestock excreta,the fermented remainder of marsh gas and agricultural organic refuse and benefits in their application are discussed．The existing problems in utilization of organic wastes and its development trend are also discussed．
Four-in-one eco-agricultural model and its application
Wang Chunxiang, Li Xueda, Gao Jinku, Gao Feng
1998, 6(1): 77-79.
Abstract(1561) PDF(897)
Abstract:
From both theoretical and practical point of view, the methodology and techniques for the construction of four-in-one eco-agricultural model are discussed．The benefits from that combination are analyzed．It builds up a scientific background for the popularization of this model in northern China．
Suitability of cloud conditions for artificial rainfall enhancement by aircraft
Duan Ying, Wu Zhihui, Shi Lixin
1998, 6(1): 80-83.
Abstract(1275) PDF(879)
Abstract:
based on data obtained from many events of aircraft rainfall enhancement operations，the suitable weather systems and patterns for artificially seeding supercooled clouds，the macro-physical characteristic of clouds for seeding，the micro-physical characteristics and the suitable conditions of precipitating stratiform clouds of cold front returning weather systern for seeding are analyzed．Results suggest that rainfall enhancement could be easily achieved when clouds are under conditions of less than 2km of cloud base height．more than 2km of cloud thickness，more than 1．5km of the supercooled layer,4．O～5．5km of seeding height，temperature ranging from -6～-13℃ and in developing stage of the weather system. There are two main cloud layers vertically in the spring cloud front weather system，i．e．． As layer above the frontal surface and Sc layer below the frontal surface．when ralnfall is about to occur，there is Fc near the ground．Parpticle Measuring Systems(PMS)data indicate that there are two layers with high liquid water content，corresponding to the middle parts of As and Sc respectively．The analysis suggests that this type of cold front weather system could be seeded for artifieial rainfall enhancement in spring and in wummer in Hebei Province．

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