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【目的】明确膜下滴灌棉花不同氮肥施用策略对棉花生长的影响。【方法】在新疆库尔勒市包头湖农场进行大田试验,对不同生育期棉株干物质积累进行测定。【结果】各处理棉株干物质积累动态都呈“S”型曲线,用Logistic生长函数进行拟合,模型拟合较好;棉花干物质积累速率最快时间在初花期至盛铃期,棉株干物质积累总量与皮棉产量之间存在很好的一致性,各处理间单株铃数、籽棉产量、皮棉产量存在显著差异,而各个处理间单铃重和衣分差异不显著。【结论】在蕾期、花铃期前轻后重,盛铃期前重后轻的施肥策略能够获得较高的干物质积累量,其产量也最大。
【Objective】 The objective of this study was to determine the effects of different nitrogen application strategies on the cotton growth under drip irrigation. 【Method】 Field trials were conducted in Baotou Lake Farm in Korla, Xinjiang to determine the dry matter accumulation of cotton plants in different growth stages. 【Result】 The results showed that the dynamic changes of dry matter accumulation in all treatments showed “S ” curve, which was fitted by Logistic growth function, and the model fitted well. The fastest dry matter accumulation rate of cotton at the initial florescence to Shengling period , There was a good consistency between cotton plant dry matter accumulation and lint yield, there was a significant difference in the number of bolls per plant, seed cotton yield and lint yield among treatments, but there was no significant difference between individual bolls weight and lint percentage . 【Conclusion】 In the budding stage, the light weight before heavy-flowering period, and the light-weight fertilization strategy before the full-boll stage can obtain higher dry matter accumulation and the highest yield.