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《Acta Agronomica Sinica》 2014-11
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Effects of Nitrogen Topdressing Method and Time on Plant Type and Dry Mass Production of Super Early-rice

ZENG Yong-Jun;Lü Wei-Sheng;PAN Xiao-Hua;ZHU De-Feng;TAN Xue-Ming;HUANG Shan;SHANG Qing-Yin;SHI Qing-Hua;Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education / Key Laboratory of Crop Physiology, Ecology and Genetic Breeding of Jiangxi Province / Jiangxi Collaborative Innovation Center for the Modernization Production of Double Cropping Rice;China National Rice Research Institute;  
Two super hybrid early-rice combinations Luliangyou 996 and Ganxin 203 were used to study the effects of nitrogen topdressing method and time on plant type and dry mass production. The results showed that, compared with the treatment of nitrogen top dressed one time at the 5th day after transplanting one time, higher grain yields were obtained in the treatments of fractionalized top-dressing due to the longer top three internodes, stronger stem and ideotype plant, high chlorophyll contents in leaves and dry matter accumulation from heading to maturity. Under the condition of 20% nitrogen top-dressed at the 5th day after transplanting, 30% panicle nitrogen fertilizer applied in the second leaf age from top was beneficial to obtaining a higher grain yield resulting from the reasonable stems-leaves distribution of the plant and the high amount of dry matter production after heading. If the panicle nitrogen fertilizer applied earlier than that time, the grain yield would be reduced because of the too long leaves, too large leaf drop angle, less spikelet number per panicle, low grain-leaf ratio and low dry matter production after heading. Grain yield would be also reduced if the panicle nitrogen fertilizer applied too late because of the low leaf area index and low dry matter production before heading.
【Fund】: 国家科技支撑计划项目(2011BAD16B04);; 国家农业科技成果转化资金项目(2013GB2C500244);; 江西省高校科技落地计划项目(12003);; 中国农业科学院水稻高效栽培技术创新团队项目;; 江西农业大学科学基金项目资助
【CateGory Index】: S511
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