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Losses of fertilizer-derived N from transplanted rice after heading

机译：抽穗后移栽水稻中化肥中氮的流失

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Microplot field experiments with N-15-labeled (NH4)(2)SO4 were conducted to investigate the changes in the percentage of fertilizer N-15 recovery (%FNR) of transplanted rice (Oryza sativa L.) with basal (4 g m(-2)) and topdress (3 g m(-2)) applications for two years. In 1999, %FNR from the basal N-15 application decreased by 6% (0.23 g N m(-2))from heading + 2 d to maturity, and %FNR from the topdress N-15 application decreased by 11% (0.32 g N m(-2))from heading 4 d to maturity. In 2000, %FNR from the topdress N-15 application decreased by 9% (0.26 g N m(2)) from heading - 1 d to maturity, whereas there was no significant decline in %FNR from the basal N-15 application after heading. A decrease in %FNR occurred even when total N of rice plants showed no decrease after heading. Nitrogen harvest index of fertilizer N-15 with the topdress N-15 application was not significantly different from that with the basal N-15 application in 1999, whereas N harvest index of fertilizer N-15 with the topdress N-15 application was higher than that with the basal N-15 application in 2000. N harvest index of fertilizer N-15, that indicated the proportion of the N-15 remobilized to panicles after heading, was substantially responsible for changes in %FNR from the basal and topdress N-15 applications after heading.
机译：进行了N-15标记的（NH4）（2）SO4的微样田间试验，研究了以基础（4 gm（ -2））和topdress（3 gm（-2））申请两年。 1999年，基部N-15施用的％FNR从抽穗期+ 2 d到成熟期降低了6％（0.23 g N m（-2）），而氮肥从顶部施用N-15施用的％FNR降低了11％（0.32 g N m（-2））从标题4 d到到期。在2000年，从施用N-15到施用第一天至成熟期，施用N-15的％FNR下降了9％（0.26 g N m（2）），而施用基础N-15后的FN却没有显着下降。标题。即使抽穗后水稻植株的总氮未显示出减少的趋势，FNR也会降低。氮肥氮肥施用氮肥氮肥施用氮肥的氮素吸收指数与基肥氮肥施用氮肥的氮素收获指数相比，氮肥氮肥施用氮肥氮肥的氮素收获氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥氮肥施用氮肥氮肥氮肥氮基肥在2000年的施用量为N。肥料N-15的氮素收获指数表明抽穗后移栽到穗上的N-15的比例，这是造成N-基肥和底肥F％变化的主要原因。前往后15项申请。

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