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研究了枣棉间作下棉花干物质积累与产量品质对不同施氮量的响应机制,确定枣棉间作的合理施氮量,为果棉间套作立体种植模式的合理氮肥运筹,提高棉花产量与品质提供理论依据。以在南疆的主栽棉花品种“中棉所49”为材料,研究了4个氮素水平(N 0、150、450和750 kg/hm2)下棉花干物质的积累和产量的差异。结果表明,不同施氮量下棉花干物质累积存在显著差异,氮素缺乏或过量均影响其干物质在不同生育时期的累积量,使产量降低。施氮量对棉花品质也有显著影响,合理的氮肥用量不但能提高棉花单株结铃数和单铃重,从而提高产量,而且可使其有较好的整齐度,棉纤维长度,比强度和马克隆值。因此,在枣棉间作条件下,施氮量为N 450 kg/hm2时棉花的干物质积累量较高,增产效果显著,品质较好。
The mechanism of cotton dry matter accumulation and yield quality response to different nitrogen application rates was studied, and the reasonable nitrogen application rate was determined, which was a reasonable nitrogen fertilizer operation for three-dimensional cropping patterns of cottonseed intercropping system and increased the yield of cotton Quality to provide a theoretical basis. Taking the main cotton variety “Zhongmiansuo 49” in southern Xinjiang as the material, the differences of cotton dry matter accumulation and yield at four nitrogen levels (N 0, 150, 450 and 750 kg / hm 2) . The results showed that there was a significant difference in dry matter accumulation of cotton under different N application rates. Nitrogen deficiency or excess affected the accumulation of dry matter at different growth stages and decreased the yield. The amount of nitrogen fertilizer also had a significant effect on the cotton quality. The reasonable amount of nitrogen fertilizer could not only increase the number of bolls and boll weight per plant, but also improve the yield, but also make it have better uniformity, cotton fiber length, specific strength and Micronaire value. Therefore, under the condition of intercropping with date cotton, the dry matter accumulation of cotton is higher when the nitrogen application rate is N 450 kg / hm2, the yield increase effect is remarkable and the quality is better.