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《Chinese Journal of Tropical Crops》 2012-12
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Effects of Nitrogen Application Amount on the Yield Formation and Nitrogen Utilization in Spring Hybrid Rice T78 You 2155

CHEN Xiaobo1,ZOU WenGuang2,RAO Mingdian2,ZHUO Wei2 1 Fujian Vocational College of Agriculture,Fuzhou,Fujian 365500,China 2 Sanming Institute of Agricultural Science,Shaxian,Fujian 365509,China  
Experiments were conducted to evaluate the effects of different levels of nitrogen application amount on the yield formation and nitrogen utilization in Spring hybrid rice T78 You 2155.The results showed that the increase of nitrogen application amount could promote tillering and increase the number of stems,tillers and effective panicle.The nitrogen concentration of plant organs,nitrogen uptake per hectare and nitrogen uptake by per 1 000 grams of rice were positively related to nitrogen application amount but curvedly related to rice yield,indicating that neither too high amount nor too low amount of them was beneficial to high yield.Both dry matter accumulation and rice yield had a curve relationship with nitrogen application amount,suggesting that neither too high nor too low amount of nitrogen application was helpful to dry matter accumulation or high yield of rice.Meanwhile,rice yield had a curve relationship with dry matter accumulation likewise,meaning that too high amount of the latter did no good to high yield.In addition,nitrogen utilization efficiency was linearly correlated to nitrogen application amount,implying that either too high or too low amount of nitrogen application would reduce its efficiency.Consequently,to ensure a high yield,high efficiency and high utilization rate for Spring hybrid rice T78 You 2155,the best amount of nitrogen applied in each hectare is about 160 kilograms.
【Fund】: 福建省科技厅重大科技专项“优质高产抗病杂交水稻新组合选育”(No.2004NZ01-4)
【CateGory Index】: S511.31
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