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选用具有超高产潜力的豫麦 4 9号 ,研究了总施氮量 2 70 kg.hm- 2 时不同氮肥施用时期与比例对小麦干物质积累及产量的影响。结果表明 ,1干物质积累量及日积累量在拔节期以前随底施氮肥比例的增加而增加 ,同时又受追施氮肥的影响。植株地上部干物质日积累量高峰值出现在抽穗～灌浆初期 ;2药隔期追施氮肥 ,可以改善产量性状 ,提高产量。扬花期喷施氮肥 ,明显降低了小穗数
In this study, Yumai No.49 with super high yield potential was selected to study the effects of different N application periods and ratios on dry matter accumulation and yield of wheat at a total nitrogen application rate of 2 70 kg · hm -2. The results showed that the dry matter accumulation and daily accumulation increased with the increase of N application rate before jointing stage, and were affected by topdressing nitrogen fertilizer at the same time. The peak value of dry matter accumulation in aboveground part of plant appeared in the stage of heading to early grain filling. The topdressing of nitrogen fertilizer every 2 days could improve the yield traits and increase the yield. Nitrogen fertilizer flowering stage, significantly reducing the number of spikelets