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《Guizhou Agricultural Sciences》 2016-11
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Effects of Reducing Chemical Fertilizer Application on Rice Population Quality in Different Rotation System

ZHOU Yulei;CHEN Xuanjing;YANG Min;ZHANG Yueqiang;SHI Xiaojun;Chongqing18th Secondary School;College of Resources and Environment,Southwest University;National Monitoring Station of Soil Fertility and Fertilizer Efficiency on Purple Soils;  
To provide the theoretical basis for agricultural production model transition in Sichuan Basin,the authors conducted experiments of four fertilization methods(nitrogen deficiency,phosphate deficiency,optimum fertilization and farmer's fertilization practice)to study the effects of reducing chemical fertilizer application on tiller,dry matter accumulation and yield components of rice based on different rotation systems(Rice Vegetable,Rice Fallow and Rice Wheat).Results:Appropriate reducing fertilization could reduce the occurrence of ineffective tillering and improve quality of rice population.At the same time,it could control the accumulation rate of dry matter in the early growth stage of rice and increase the dry matter and nutrient accumulation in the late heading stage to increase yield under the premise of reducing the amount of chemical fertilizer.Compared to nitrogen deficiency treatment,optimum fertilization increased tiller numbers by 32.7%,37.2% and 54.8% in RV,RF and RW during mature stage,respectively.In rice-fallow and rice-wheat rotation,compared to farmer's fertilization practice,optimum fertilization reduced the occurrence of ineffective tiller of 29.7%and 22.13%.In addition,it also improved dry matter weight after heading by 8.4%,114.6% and 41.4% in different rotation,respectively.Yields of optimum fertilization treatment was the highest in three rotation systems which were 9 292kg/hm2,7 389kg/hm2 and 6 741kg/hm2 and was higher than farmer's fertilization practice treatment by 15.9%,10.8% and 11.6%,respectively.
【Fund】: 国家自然科学基金项目“四川盆地不同轮作制度净温室效应研究”(31471944);; 中央高校学科团队基金项目“三峡库区化肥减施增效技术创新与集成”(2362015xk06)
【CateGory Index】: S511;S344.1
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