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采用两种类型品种进行了三种氮肥处理试验 ,对超高产小麦叶片 NRA的变化动态 ,氮肥处理对 NRA和产量构成因素的影响进行了研究 ,阐述了 NRA与产量和产量构成因素的关系。结果表明 :从分蘖期始 ,小麦叶片 NRA逐渐上升 ,至开花期达到最高 ,后又逐渐下降。不同氮肥处理的 NRA在分蘖至孕穗差异不大 ,孕穗之后 ,氮肥一次底施的 NRA明显低于药隔期重施和药隔期补施。药隔期追氮可明显促进成穗数、穗粒数、千粒重、穗粒重等产量构成因素的增加 ,对提高产量具有重要作用。对两种类型品种 ,普通型的豫麦 4 1号宜采用药隔期重施追肥 ,大粒型的兰考 86( 79)药隔期补施氮较好。NRA与产量、产量构成因素的相关关系 ,在分蘖至拔节期间表现不密切 ,但孕穗至成熟期间与产量的相关系数均达高度正相关 ,与穗粒数、穗粒重的相关关系也较为密切
Three types of nitrogen fertilizer treatments were used to study the dynamic changes of NRA in super high yield wheat and the effects of nitrogen fertilizer on NRA and yield components. The relationship between NRA and yield and yield components was also discussed. The results showed that from the beginning of tillering stage, the NRA of wheat leaves increased gradually and reached its peak at flowering stage and then decreased gradually. NRA with different N treatments had little difference from tillering to booting. After booting, the NRA of one application of nitrogen fertilizer was significantly lower than that of NRA during re-application and filling at different intervals. Nitrogen recovery at different intervals can obviously increase the yield components such as spike number, spike number, 1000-grain weight and spike weight, which play an important role in increasing yield. For the two types of varieties, the common type of Yumai 4 1 should be re-applied topdressing every other period, and the large grain Lankao 86 (79) should be supplemented with nitrogen at different intervals. The correlation between NRA and yield and yield components did not show significant correlation between tillering stage and jointing stage. However, the correlation coefficients between NRA and yield were highly positively correlated with the correlation between NRA and grain yield per plant and grain weight per plant.