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丘陵红壤旱地植棉,由于土层浅薄,有机质贫乏,保水保肥力差,易旱易涝,若田间管理不善就会出现晚发、早衰等现象,尤其是早衰现象发生普遍严重,对棉花单产提高影响很大。 一、棉花早衰的表现 红壤旱地棉花出现早衰的时间,一般在7月下旬到8月中、下旬,其表现大约有以下几点: 1、棉花进入伏、秋旱季后,棉花红茎透顶,叶色发乌,继而叶片凋萎,最后焦枯脱落,株高只有50—60厘米,果枝短而细;蕾、花、幼铃大量脱落,上部果枝无桃,单产不到40斤;
Hilly red soil dryland cotton, due to shallow soil, poor organic matter, poor water and fertility, drought and easy flood, if the field management will appear late, premature aging and other phenomena, especially premature aging phenomenon is generally serious, to increase cotton yield great influence. First, the performance of cotton premature aging Red soil dry cotton premature aging time, generally late in July to August in late, its performance about the following points: 1, the cotton into the volt, autumn dry season, the cotton stalks, leaves Color hair black, then withered leaves, and finally scorch off, plant height of only 50-60 cm, fruiting branches short and thin; buds, flowers, a large number of young bell off, the top fruiting branches without peach, yield less than 40 pounds;