新疆棉花高产的群体组合研究

Study on Population Combination of High Yield of Cotton

在水肥条件适宜的情况下，新疆次宜棉区新陆早７号的种植密度在１２×１０４～２４×１０４株·ｈｍ－２之间，随密度增加，苗期的出叶速度、茎粗、单株叶面积和干物质积累基本相同，但叶面积系数和单位面积干物量成正比增长；初花后，群体出现自身调节作用，随密度增加，以缩小个体来稳定群体，表现单株叶面积、茎粗、干物重、成铃数、单铃重下降，出叶速度减慢，衣分则保持不变，单位面积总铃数、总干物量上升。叶面积系数最大时，处于相同水平，最佳群体组合为２１×１０４株·ｈｍ－２左右。

A study on population combination of Xinluzao 7 under apporaite fertility and water in sub suitable growing area. The results indicated that: Increasing plant density increased mean leaf area index(LAI) and total dry matter before primary flowering date, but different densities could maintain the same level on the growth rate of leaf, diameter of stem, leaf area/plant and acculation of dry matter. Capacity of population autoregulation became apparent after primary flowering date, the growth rate of leaf. Diameter of boll stem, leaf area/plant, acculation of dry matter, boll rentention and single boll weight were closely negatively associated with plant density. However, total dry matter and boll rentention per unit area were increased, the maximum LAI of different population were the same level. 21×10 4 plant·hm -2 is the best population combination in this report.