Improvement of Rice Yield and Soil Phosphorus and Potassium Fertility by Green Manure Rape Returning
SHENG Xuewen
TAO Yueyue
XU Jian
WU Zhenggui
WANG Haihou
SUN Hua
Abstract：To evaluate the effects of rape at final-flowering stage as green manure on rice yield,the concentration of soil and water nutrients,a two-year field experiment was carried out in the typical paddy field of the Taihu region.The effect of different rape-rice cultivation system(green manure rape-rice and forage rape-rice)on the grain yield,yield components,the concentration of soil total nitrogen,available phosphorus and potassium in the top soil as well as the total concentration of nitrogen and phosphorus of surface water in paddy field was studied.The results showed that the yield of rice with the return of green rape was increased by 6.1％～15.2％compared to the CK treatment.In the 1 st experimental year,the number of effective panicles was significantly increased by 20.0％,the rate of panicle formation was obviously increased by 14.7％,and the filled grains per panicle were enhanced by 13.1％(P＜0.05).No significant difference was found on the percentage of filled grains and 1000-grains weight.After two consecutive years with rape returning,no significant difference was found on soil total nitrogen concentration,but the available phosphorus and potassium content in the top soil were significantly increased by 31.6％and 27.8％,respectively(P＜0.05).The total nitrogen and phosphorus concentration of farm surface water from transplanting stage to tillering stage were enhanced by 36.3％and 53.7％,respectively(P＜0.05).Therefore,green manure rape returning can maintain rice yield as well as supplement of soil phosphorus and potassium nutrients.However,appropriate returning technique of green rape should be improved at the same time to reduce the pollution risk in the farmland,which can provide effective environmental protection fertilization techniques such as organic substitution of chemical fertilizers and green prevention and control.
Keywords：Green manure rape-rice rotation systemRice yieldSoil nutrientNutrient of surface water in paddy fieldYield component
Publication Date：2024-08-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 29-34 )