打顶对海岛棉产量和品质性状空间分布的影响

以新海21号为试验材料,研究不同打顶时期对海岛棉产量和纤维品质的影响,结果表明:随打顶时期推迟,棉铃空间分布上移,单株结铃数成单峰曲线,单铃重下降,衣分无显著变化.打顶影响最显著的3个纤维品质构成因子依次是马克隆值、伸长率、比强.随打顶时间推迟,马克隆值近似先降低后增大的单峰曲线,伸长率呈波形曲线,比强逐渐下降.早打顶(7月5、10日)品质贡献率,上部＞中部＞下部;7月15、20日打顶品质贡献率,中部＞下部＞上部;晚打顶(7月25、30日)品质贡献率,中部＞上部＞下部.

Effect of Different Tip Pruning Periods on Yield and Fiber Quality Space Distribution of Sea Island Cotton

This paper mainly discussed the influence of different tip pruning period on yield and fiber quality in 2.85×105 per hectare density of the island cotton Xinhai 21 in the south of Xinjiang.The result indicated that as period of tip pruning went by,the boll spatial distribution was upturned and the amount of cotton plant bolls presented single culmination.As single boll weight was declined,there was no marked change of lint percent.The first three fiber quality factors which have an effect on tip pruning period are Macrom value,Elongation and Breaking Specitfic Strength respectively.As period of tip pruning went by,the strength was declined and Macrom value submited only summit curve.Early tip pruning(Jul.5,10 d)let fiber quality contribution rate present: top canopy>mid canopy>button canopy;Jul.15,20 d present: mid canopy>button canopy>top canopy;later tip pruning present(Jul.25,30 d): mid canopy>top canopy>button canopy;