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《Journal of Nuclear Agricultural Sciences》 2014-08
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Effects of Nitrogen Application Rates and Plant Spacing on Nutrient Translocation during Filling Stage and Yield of Mechanical-transplanted Hybrid Rice

SUN Yong-jian;MA Jun;SUN Yuan-yuan;YANG Zhi-yuan;XU Hui;XIONG Hong;XU Fu-xian;Rice Research Institute of Sichuan Agricultural University;Key Laboratory of Crop Physiology,Ecology,and cultivation in southwest,Ministry of Agriculture;Institute of Plateau Meteorology,CMA;Rice and Sorghum Institute,Sichuan Academy of Agricultural Sciences;  
In this study,effects of nitrogen( N) application rate and plant spacing on nutrient translocation and yield of mechanical-transplanted hybrid rice during filling stage were investigated with medium-late maturity hybrid rice combination Yuxiang 203,and correlation of some indices of nutrient translocation of different vegetative organs with yield. The results showed that there was an obvious regulatory effect of different N application rate and plant spacing on N,P,K translocation of mechanical-transplanted rice in leaves and stem-sheathes during filling stage and grain yield.Compared with other treatment,applying 150 kg N·hm-2with suitable plant spacing 17. 5 cm was the best combination under mechanical-transplanted row spacing 30 cm in this paper,which improved nutrient translocation conversion rate of vegetative organ,alleviated contradiction of ear and kernel under high yield cultivation,and enhanced grain yield.Applying N was 105 kg · · hm-2with the suitable plant spacing 15 ~ 17. 5 cm under mechanical-transplanted row spacing 30 cm in this study. However,applying N was increased to 195 kg·hm-2,in order to alleviate export and translocation percentage of stem-sheaths,and improved total spikelets and seed setting,plant spacing should be enlarged,the suitable plant spacing was 17. 5 ~ 20 cm under mechanical-transplanted row spacing 30 cm in this study.Correlation analysis indicated that there existed significant or highly significant correlations of grain yield with nutrient translocation of leaf and stem-sheathes from heading to maturity. According to the conditions above,it was important for increasing yield that P and K translocation efficiency of leaf and stem-sheaths showed a positive correlation with grain yield( r = 0. 551**~ 0. 693**) during the filling stage. The study provided the theoretical and practical basis for mechanized transplanting technolgy of medium-late maturity hybrid rice.
【Fund】: 国家科技支撑计划项目(2011BAD16B05 2012BAD04B13 2013BAD07B13);; 农业部水稻产业技术体系(西南地区)专项;; 农业部作物生理生态与耕作重点实验室开放课题资助项目(201303);; 四川省育种攻关专项(2011NZ0098-15)
【CateGory Index】: S511.32
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