Effect of integrated rice-crayfish farming system on soil physico-chemical properties in waterlogged paddy soils

SI Guohan; PENG Chenglin; XU Xiangyu; XU Dabing; YUAN Jiafu; LI Jinhua

doi:10.13930/j.cnki.cjea.160661

Volume 25 Issue 1

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Article Navigation > Chinese Journal of Eco-Agriculture > 2017 > 25(1): 61-68

SI Guohan, PENG Chenglin, XU Xiangyu, XU Dabing, YUAN Jiafu, LI Jinhua. Effect of integrated rice-crayfish farming system on soil physico-chemical properties in waterlogged paddy soils[J]. Chinese Journal of Eco-Agriculture, 2017, 25(1): 61-68. doi: 10.13930/j.cnki.cjea.160661

Citation:

SI Guohan, PENG Chenglin, XU Xiangyu, XU Dabing, YUAN Jiafu, LI Jinhua. Effect of integrated rice-crayfish farming system on soil physico-chemical properties in waterlogged paddy soils[J]. Chinese Journal of Eco-Agriculture, 2017, 25(1): 61-68. doi: 10.13930/j.cnki.cjea.160661

Citation:

SI Guohan, PENG Chenglin, XU Xiangyu, XU Dabing, YUAN Jiafu, LI Jinhua. Effect of integrated rice-crayfish farming system on soil physico-chemical properties in waterlogged paddy soils[J]. Chinese Journal of Eco-Agriculture, 2017, 25(1): 61-68. doi: 10.13930/j.cnki.cjea.160661

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Effect of integrated rice-crayfish farming system on soil physico-chemical properties in waterlogged paddy soils

doi: 10.13930/j.cnki.cjea.160661

1.
Institute of Plant Protection and Soil Fertilizers, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
2.
Qianjiang Agro-Technology Extension Center, Qianjiang 433199, China

Funds:

the National Key Technologies R & D Project 2013BAD07B10

the National Key Research and Development Project of China 2016YFD0200807

the Natural Science Foundation of Hubei Province 2015CFC894

the Fund of Agricultural Science and Technology Innovation Centre of Hubei Province 2011-620-003-03-063

More Information

Corresponding author: E-mail:fu1682@sina.com
Received Date: 2016-07-28
Accepted Date: 2016-09-07
Publish Date: 2017-01-01

Abstract

Abstract

Integrated rice-crayfish system is a complex ecological system based on waterlogged paddy field cultivation characterized with crayfish fed by rice straw. Using rice monoculture system as the control, a 10-year (2005-2015) field experiment was conducted to study the effects of integrated rice-crayfish system on rice yield and soil physico-chemical properties at soil depths of 0-10 cm, 10-20 cm, 20-30 cm and 30-40 cm. The economic benefit of integrated rice-crayfish system was evaluated using the input-output method. The results indicated that long-term integrated rice-crayfish system significantly reduced soil compaction at the 15-30 cm layer. The soil compaction in 15 cm, 20 cm, 25 cm and 30 cm soil was lower in integrated rice-crayfish system than in rice monoculture system by 20.9%, 29.9%, 24.8% and 14.7%, respectively. Long-term integrated rice-crayfish system increased soil water-stable aggregates (>0.25 mm) content, aggregate mean weight diameter (MWD) and geometric mean diameter (GMD) in the 0-40 cm layer, but decreased aggregate fractal dimension (D) in the 0-20 cm layer. Compared with rice monoculture system, long-term integrated rice-crayfish system significantly increased the contents of soil organic carbon, total K and available N in the 0-40 cm layer, then total N in the 0-30 cm layer, total P and available P in the 0-10 cm layer and available K in the 20-40 cm layer. The total amount of reducing matter in the 0-10 cm soil layer of the long-term integrated rice-crayfish system was lower than that in the monoculture rice system, but it was higher in the 20-30 cm soil layer. Rice yield in integrated rice-crayfish system significantly increased by 9.5% than that in the monoculture rice system. The output, profit and ratio of output to input in integrated rice-crayfish system were higher than those in the monoculture rice system by 46 818.0 ￥·hm^-2, 40 188.0 ￥·hm^-2 and 100.0%, respectively. It was therefore clear that integrated rice-crayfish system improved soil structure, enhanced soil nutrient and increased rice yield and economic benefit. However, it also increased the risk of soil gleying in the 10 cm depth.
- Integrated rice-crayfish system,
- Waterlogged paddy field,
- Soil structure,
- Organic carbon,
- Soil nutrient,
- Economic benefit

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References(32)

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