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《Chinese Journal of Eco-Agriculture》 2010-01
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Effect of nitrogen application strategy in the first cropping rice on dry matter accumulation,grain yield and nitrogen utilization efficiency of the first cropping rice and its ratoon rice crop

CHEN Hong-Fei 1,2,YANG Dong 3,LIANG Yi-Yuan 2,ZHANG Zhi-Xing 2,LIANG Kang-Jing 2,LIN Wen-Xiong 1,2 (1.School of Life Sciences,Fujian Agriculture & Forestry University,Fuzhou 350002,China;2.Institute of Agro-ecology,Fujian Agriculture & Forestry University,Fuzhou 350002,China;3.Rice Research Institute,Fujian Academy of Agricultural Sciences,Fuzhou 350002,China)  
The effect of fertilizer application strategy on nitrogen and dry-matter accumulation,grain yield and nitrogen utilization efficiency (NUE) of the ratoon rice crop and its first cropping rice was determined through designing 3 nitrogen applied proportion between basal-tiller dressing and panicle dressing [8:2(N 1),7:3(N 2),6:4(N 3)] in the first cropping rice season with a constant nitrogen supply at 225.00 kg·hm-2 in the experiment.The results indicate that N accumulation under N 3 treatment is 9.26% and 3.54% higher at ripening stage of the first cropping rice than that under N 1 and N 2 treatments.Transportation of N from vegetative parts to panicle during grain-filling stage of the first cropping rice under N 3 is separately 21.47% and 6.76% higher than under N 1 and N 2 treatments.For the entire growth period,net dry-matter accumulation in rice under N 3 treatment increases by 5.10% and 4.78% compared with N 1 and N 2.For grain yield of the first cropping rice,N 3 treatment produces the highest (12 431 kg·hm-2),which is significantly higher than that produced by N 1 and N 2.N utilization efficiency of N 3 treatment is as high 46.44%,14.81% and 5.43% higher than that under N 1 and N 2.N agronomic efficiency in N 3 treatment is 20.66 kg·kg-1,14.97% and 12.34% higher than in N 1 and N 2.Furthermore,the results show that different nitrogen proportion between basal-tiller dressing and panicle dressing with a constant nitrogen supply (225.00 kg·hm-2 N fertilizer) in the first cropping rice has no significant influence on the ratoon rice crop.
【Fund】: 国家自然科学基金项目(30600385);; 福建省自然科学基金项目(2009J01060)资助
【CateGory Index】: S511.01
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