Nitrogen Absorption and Utilization Efficiency in Early Hybrid Rice of Fujian Province
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摘要: 对福建杂交早稻金优2155和T78优2155进行施氮量试验,结果显示,两品种各器官的含氮量随着植株生长发育进程而逐渐降低;移栽后,两品种各生育期各器官的含氮量、氮素积累量、籽粒中氮素来自营养体转运量随施氮量的增加而增加;T78优2155氮素积累量和灌浆期间籽粒的氮素吸收更依赖于营养体;两品种的氮收获指数、土壤氮贡献率在不同氮肥处理间差异不显著,两品种的氮收获生理效率随施氮量的增加而减少,而两品种的氮肥利用率随施氮量的增加表现出不同的变化趋势。Abstract: The experiments were conducted to evaluate the effects of different levels of nitrogen application amount on early hybrid rice of Fujian province‘Jinyou 2155’and‘T78you 2155’.The results indicated that nitrogen contents in organs of the two cultivars decreased with plant growth and development process;The nitrogen contents,nitrogen accumulation and nitrogen amount from vegetation transfer in different organs of the two cultivars at different growing stages increased with the increase of nitrogen application amount after the transplant;The nitrogen accumulation and nitrogen uptake amount during the period of grain grouting depended more on vegetation in‘T78you 2155’;Nitrogen harvest index and soil nitrogen contribution ratio between two cultivars had no significant difference among different nitrogen treatments.Nitrogen crops physiological efficiency of the two cultivars reduced with the increase of N application amount,while nitrogen fertilizer utilization ratio of the two cultivars showed different changing trend as the increase of nitrogen application.
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