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《Journal of Nuclear Agricultural Sciences》 2018-02
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Response of the Field Utilization Efficiency of Nitrogen and Phosphorus to the Reduction in Chemical Fertilizer's Application on Rice-rape Rotation Area in Eastern Hunan

WANG Lingling;DONG Chunhua;LUO Zunchang;ZOU Zhaohui;XIE Yi;HONG Xi;CHU Fei;FANG Yong;Long Ping Branch,Graduate School of Hunan University;Hunan Institute of Soil and Fertilizer;Hunan Institute of Nuclear Agriculture and Space Breeding;Hunan Agricultural Biotechnology Research Center;  
In order to improve the utilization efficiency of nitrogen and phosphorus,as well as annual crop production in the field with application of different chemical reduced fertilizer treatments. The annual variation of the yield of rice and rape,the utilization efficiency of nitrogen and phosphorus, and the content of available nitrogen and available phosphorus in soil based on a rice-rape rotation field experiment set in 2015 in eastern hunan were studied. For this field experiment,seven differ treatments were set up: T1) no fertilization,T2) regular chemical fertilizer,T3) 80% regular chemical N + 20% organic N,T4) 70% chemical N + 30% organic N,T5) 20% total N reduced based the T4 +nitrogen synergist,T6) 20% total P reduced based on T4 + phosphorus activator,T7) 20% total N reduced + 20% total P reduced based on T4 + nitrogen synergist and phosphorus activator. The results indicated that the annual grain productions and total biomass of crop and the annual utilization efficiency of nitrogenous and phosphate fertilizers of both T3 and T4 treatments were increased by 2. 6% and 4. 8% ,17. 6% and 34. 7% ,respectively,if compared with T2 treatment. For these indexes,T6 and T7 treatments were increased by 1. 2% and 3. 2% ,2. 5% and 11. 8% ,respectively,if compared with T4 treatment. Compared to the regular fertilizer treatment,all of the annual grain yield and total biomass of crop and the annual utilization efficiency of nitrogenous and phosphate fertilizer indexes of T4,T6 and T7 treatments were increased by 5. 2% ,9. 6% ,27. 8% and 60. 2% ,respectively,that soil supply laws of nitrogen and phosphorus were much more consistent with the nutrient absorption law in the field. These findings are important to the practical and theoretical supports to clear the application of integrated technology of chemical reduction efficiency on the area of rice-rape rotation in eastern Hunan.
【Fund】: “十三五”国家重点研发计划(2015BAD23B03、2016YFD0200809)
【CateGory Index】: S511;S565.4
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