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《China Rice》 2017-04
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Effects of Soil-based Yield at Different Region in Southwest China on Optimized Application Amounts of Nitrogen and its Agronomic Efficiency of Mid-season Hybrid Rice

XU Fuxian;LIU Mao;ZHANG Lin;ZHOU Xingbing;ZHU Yongchuan;GUO Xiaoyi;JIANG Peng;XIONG Hong;Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences/Key Laboratory of Southwest Rice Biology and Genetic Breeding,Ministry of Agriculture;  
In order to improve the nitrogen efficiency of hybrid rice, the soil-based yield, optimized application amounts of nitrogen and its agronomic efficiency of mid-season hybrid rice were studied, using Ⅱ-you 7, Yuxiangyou 203, Chuanxiangyou 9838 and Rong18 you 1015 as materials, in different ecological sites, soil nutrient statuses and N application levels in 2009-2016. Data were analyzed by using variance correlation, correlation regression and partial correlations. The results showed that the soil-based yield were influenced greatly by soil nutrient statuses, the variations of soil-based yield ranged from 5072.1 to 8351.55 kg/hm~2 at 7 ecological sites in Southwest China, the contributions of the soil-based yield(the percentage of the soil-based yield in the fertilized yield)ranged from73.55% to 83.67% on the average of four varieties and 80.05% on the average of seven locations, the regression forecasting model were established between the soil-based yield and soil nutrient statuses(R2 ranged from76.77% to 99.99%). There were significant positive effects between the soil-based yield and total nitrogen, total phosphorus of soil,and has significant significantly negative effects with altitude, total potassium and effective phosphorus, respectively. Need to fill nitrogen supply to obtain rice high yield because of the soil nitrogen deficiency, P and K application is not the main direction for increasing rice yield in the Southwest area China. Regression equations were established respectively between optimized application amounts of nitrogen as well as its agronomic efficiencies and the soil-based yield in rice(R2 66.68% and 65.46%). Applying optimized application amounts of nitrogen ranged from 192.21~74.46 kg/hm~2 or the agronomic efficiencies ranged from 19.88~4.51 kg grain/kg N as the soil-based yield ranged from 5 250 kg/hm~2 to 9 000 kg/hm~2, which would be used as the scientific basis for the determination of efficient applied N amount for full scale rice cultivation.
【Fund】: 国家现代农业产业技术体系建设专项(CARS-01-29);; 国家公益性行业(农业)专项(20120302);; 国家粮食丰产科技工程(2013BAD07B13-05);; 四川省财政基因工程
【CateGory Index】: S511.32
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