目录
摘要Ⅱ
关键词Ⅱ
AbstractⅢ
引言
引言1
1材料与方法3
1.1试验设计3
1.2测定内容与方法3
1.3数据处理方法3
2结果与分析3
2.1种植密度和施氮量对棉花群体质量指标的影响3
2.1.1株高3
2.1.2果枝果节4
2.1.3脱落率5
2.1.4叶面积指数5
2.1.5叶绿素 6
2.1.6干物质量积累与分配 7
2.2种植密度与施氮量对棉花产量和品质的影响 8
2.2.1产量及产量构成8
2.2.2纤维品质 9
3讨论9
3.1种植密度和施氮量对棉花群体质量指标的影响9
3.2种植密度和施氮量对棉花产量及品质的影响11
4小结12
致谢12
参考文献13
麦后直播机采棉高产优质群体质量调控
摘 要
棉花传统种植方式成本高而收益低，且劳动力需求大，故麦后直播棉逐渐成为棉花的主要种植方式。目前，在棉花生产实践中，提高产量与改善品质仍然是主要目的。种植密度和施氮量能够影响棉花的生长发育和产量及品质的形成，研究这两种栽培措施对机采棉群体质量的调控具有重要意义。本试验选取“中棉所425”为供试品种，采用裂区试验设计，主区设置三种施氮量为：120kg/hm2、150kg/hm2、180kg/hm2，副区设置三种种植密度为：90000株/hm2、105000株/hm2、120000株/hm2。结果显示：增加施氮量能够提高株高，密度对株高的影响较小；棉株果枝始节普遍位于6、7节；当施氮量一定时，单位面积总果节数、果枝数与种植密度呈正相关。盛铃期，高密度下，不同施氮量处理下LAI值差异并不明显。在相同种植密度下，棉株叶片SPAD值与施氮量呈正相关。随着施氮量的增加，在高密度下，籽棉、皮棉产量增加且蕾铃脱落率降低。在高施氮量下，单株铃数、总铃数、籽棉及皮棉产量均与种植密度呈正相关。综合分析，麦后直播棉适宜种植密度为120000株/hm2，氮肥用 *51今日免费论文网|www.51jrft.com +Q: *351916072* 
量为180kg/hm2。
STUDIES ON REGULATION OF POPULATION QUALITY OF HIGHYIELD AND HIGHQUALITY COTTON DIRECTSEEDED AFTER WHEAT
ABSTRACT
Due to the high cost,low income and large labor demand of traditional cotton planting methods,direct seeding cotton after wheat gradually becomes the main planting method of cotton.At present,in cotton’s production,the main purpose is still to improve cotton’s output and quality.Planting density and nitrogen application rate can affect the growth,development and the formation of yield and quality of cotton.Studying these two cultivation measures is significant to the regulation of cotton’s output and quality.In this test, "Zhongmiansuo 425" was selected as the test variety, and the split plot experiment was adopted.Three types of nitrogen application rates were set in the main area: 120kg/hm2,150kg/hm2,180kg/hm2,and three types of density were set in the sub area: 90000plants/hm2,105000plants/hm2,and 120000plants/hm2.The results showed that increasing nitrogen application rate can improve cotton’s height while the density has little effect on it.The initial nodes of the fruit branches were generally between 67 nodes.Under the same nitrogen application rate, the total number of fruit nodes,branches were positively correlated with planting density. At peak bolling stage,when the density was 120000plants/hm2,the difference of LAI between treatments was not obvious. Under the same planting density, the SPAD was positively correlated with nitrogen application rate.When the planting density was 120000plants/hm2, with the increase of nitrogen application rate,the yield of seed cotton and lint cotton increased and shedding rates of buds and bolls decreased.When the nitrogen application rate was 180kg/hm2,the number of bolls per plant,the total number of bolls,seed cotton yield and lint cotton yield were all positively correlated with density.Generally,when the density was 120000plants/hm2 and nitrogen application rate was 180kg/hm2, the cotton’s yield and quality were higher.

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