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我国南方棉区很多属麦、棉两熟。以往虽采用育苗移栽方法,但移栽棉的成熟期比一熟棉迟,后期棉铃的纤维成熟度、强度均较低,经济效益不高。近年来采用聚氯乙烯薄膜覆盖,提早播种、提早移栽的办法。但存在棉苗在麦株间荫蔽,妨碍棉苗早发和麦行行距不能缩小等缺点。即使在麦后移栽,果枝始节(第一果枝在主茎上着生节位)仍然较高。Low 等(1969)在人工气候室用不同昼/夜温度组合和照度下培育棉苗,找出24/19℃及520卡/平方厘米/日的条件下棉苗发育早、果枝始节最低。
Many cotton fields in southern China are wheat and cotton two crops. In the past although the use of seedling transplanting method, but the maturity of cotton transplanting than one ripe cotton late boll fiber maturity, strength are low, economic efficiency is not high. In recent years, the use of PVC film covering, early sowing, early transplanting approach. However, the existence of cotton seedlings in the shade between the wheat, hinder cotton seedling early and wheat row spacing can not be reduced and other shortcomings. Even after transplanting in wheat, fruiting branches (the first fruiting branch bearing on the main stem) are still high. Low et al. (1969) cultivated cotton seedlings under different daytime / night temperature combinations and illuminations in a climatic chamber and found that cotton seedlings developed early at 24/19 ° C and 520 cal / cm 2 / day with the lowest initiation of fruit branches.