棉花在不同整枝方式下生长发育规律的研究

The Study on the Cotton Growth and Development under Two Different Agronomy Practices Topping and Pruning Via without Topping and Pruning

在两年田间试验的基础上探讨了棉花整枝打顶和简化栽培措施下生长发育的区别。供试的两个棉花品种为中晚熟品种冀668和中早熟品种中棉30。结果表明,整枝打顶处理下的棉株的株高、主茎茎节、叶面积指数和蕾数都低于对照。然而脱落果节数的减少使得整枝打顶处理的有效铃数却增加了。整枝打顶处理总干物质量减少,但是生殖器官干物质量的比例却增加了。产量组成分析表明,整枝打顶处理的总铃数增加,单铃质量和衣分处理之间没有显著差别。两个品种在不同处理间的表现趋势一致,但是中熟品种比中早熟品种的趋势更明显。

This study discussed the difference of two treatments with two type of practice：topping and pruning,without topping and pruning.In each case,two cotton cultivars（a mid late-maturity cultivar Ji668 and a mid early-maturity cultivar C30） were used.It was noted that cotton height,main stem nodes,LAI,and squares were lower in the topping and pruning treatment than the control.Higher number of retained bolls,possibly resulting from a significant reduction in abscised fruit sites was observed in the topping and pruning treatment.Though total dry matter production dropped,however,more dry matter allocation to reproductive organs was noted,which increased boll growth in the topping and pruning treatment.It was observed that cotton lint yield increased with cotton boll number.However,differences in boll size and lint percentage between the two treatments were insignificant.Cultivars under the same treatment showed similar trends but morphological differences between different treatment and control were bigger for the late-maturity cultivar Ji668 than for the early-maturity cultivar C30.