Efficient and Water-saving Irrigation Mode of Rice
Controlled irrigation is a new irrigation mode that does not require water layer in rice paddy.Under controlled irrigation mode,the sensitivity to water requirement of crop is considered fully in different growing stages,and the self-accommodation and self-adaptation ability of rice is brought into play sufficiently.Thus scientific water supply of rice is realized timely and suitably under controlled irrigation by adjusting soil moisture reasonably.Based on series of experimental information,responses of rice group identity and physical characteristic to controlled irrigation were analyzed in this paper.Then mechanisms of high quality and quantity were revealed under water-saving conditions.Further,the influence of the non-traditional irrigation mode on paddy eco-environment was discussed.Under controlled irrigation condition,soil water content ranged from 60% to 100% of saturation.In this case,leaf stomata was maintained at an appropriate opening degree,to restrain noneffective transpiration and guarantee photosynthesis simultaneously.By reasonable soil moisture regulation,high-yield tiller structure and ideal stem shape were formed.Evapotranspiration and seepage were decreased distinctly.Absorbency of root was exercised well,and organic matter was accumulated abundantly.There was no distinct water layer in paddy,soil was ventilated well and rice paddy microclimate was improved.Also,the comprehensive greenhouse effect of CH4 and N2O is reduced obviously.The experiments indicate that the controlled irrigation has the following advantages of water-saving,high-yield,high-quality,pest-resistance,anti-lodge and environmental protection.
controlled irrigation soil moisture controlling group identity physical characteristic model of efficient and water-saving eco-environment of paddy field
Peng Shizhang Zhang Ruimei Li Daoxi Guo Longzhu
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing State Key Laboratory of Hydrology- Water Resources and Hydraulic Engineering,Hohai University,Nanjin State Key Laboratory of Hydrology- Water Resources and Hydraulic Engineering,Hohai University,Nanjin
国际会议
南京
英文
9-17
2006-08-16（万方平台首次上网日期，不代表论文的发表时间）