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不同施氮肥时期对土壤供氮、稻株吸氮及产量的影响研究结果表明 :基肥对土壤供氮影响持续期长 ,一直持续到成熟期。蘖肥对土壤供氮仅影响到有效分蘖临界叶龄期。穗肥对土壤供氮影响到抽穗至成熟期。不施基肥与施基肥相比 ,植株各生育期的吸氮量少 ;不施蘖肥与施蘖肥差异较小 ,仅影响有效分蘖临界叶龄期到拔节期的吸氮量 ;不施穗肥的植株拔节到成熟期吸氮量下降 ,而不施粒肥仅影响抽穗至成熟期的吸氮量。基肥施用量在保证 N-n叶龄期达到够穗苗数的情况下 ,不施或少施蘖肥 ,增施粒肥量 ,有利于提高茎蘖成穗率 ,促进穗大粒多而高产。
Effects of Different Nitrogen Fertilizers on Soil Nitrogen Supply, Nitrogen Assimilate and Yield of Rice Plants The results showed that basal fertilizer had a long lasting effect on soil nitrogen supply and continued to maturity. Tiller fertilizer on soil nitrogen only affects the effective tillering critical leaf age. Spike fertilizer on soil nitrogen to heading to maturity. Compared with the basal application, the nitrogen uptake of plants at different growth stages was lower than that of non-basal application. The difference of non-application of tillering fertilizer and applied tillering fertilizer was only small, which affected only the nitrogen uptake from the critical leaf stage to the jointing stage of effective tillering. Fertilizer plants jointing to maturity, the amount of nitrogen uptake decline, without applying fertilizer only affects the heading to maturity N uptake. The amount of basal fertilizer in the N-n leaf age to ensure that the number of seedlings to achieve sufficient circumstances, no or less applied tillering fertilizer, increase the amount of grain fertilizer, is conducive to increasing the rate of stems into spike, spike large grain and promote high yield.