高产棉花群体结构特征与产量品质形成关系的研究

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

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16．5×10^4～20×10^4株／hm^2，“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10μmol/m^2·s以上。

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/hm^2, ＂the bell ratio of three stage＂ is the 3：5 - 5.5：1.5 - 2,the largest LAI appears in peak boiling stage, its value 3. 5- 3.6, from florescence to peak belling 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/m^2·s after bell opening stage.