高产棉花群体结构特征与产量品质形成关系的研究

通过设置田间密度试验小区,对不同密度条件下棉花个体与群体的生长发育特性与产量、品质形成特点进行研究,研究表明:南疆地区棉花最适宜种植密度应在16.5×104～20×104株/hm2, "三桃"比例为:3∶5～5.5∶1.5～2,LAI高峰宜出现在盛铃期,其值3.5～3.6,盛花-盛铃棉田冠层的光截获率要维持在90;～95;,吐絮期干物质的积累量比重在50;左右,光合速率吐絮后保持在10 μmol/m2穝以上.

Development Relationships between Characteristics,Yield and Quality of High-yield Cotton

Through the test plot of field density,under the different density condition,the cotton individual and community's growth characteristic and the yield,the quality were investigated and found in South Xinjiang,the suitable planting density of the cotton plants should be between 165 000-200 000 plant/hm2,"the boll ratio of three stage" is the 3:5-5.5:1.5-2,the largest LAI appears in peak bolling stage,its value 3.5-3.6,from florescence to peak bolling stage the cotton fields crown level's light interception rate needs to maintain at 90%95%.The proportion of dry matter accumulation at boll opening stage is about 50%,the photosynthesis speed maintains above 10 μmol/m2·s after boll opening stage.