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分别于不同时间对长绒棉军海1号打顶,打顶后于伤口处敷萘乙酸及于打顶后施盖顶肥,结果适当推迟打顶时间和打顶后施盖顶肥者,其根系伤流量增加,叶片光合强度提高,早衰减轻。打顶会引起棉株体内生长素减少,进而导致根系活力下降,根系供给地上部分的水分和矿质营养减少,叶片内的有机营养被调用,其自身的营养水平下降。这些不利于营养生长的生理变化,可能是长绒棉早衰的生理原因。
Respectively, at different times on the long staple Junjun No. 1 topping, topped after the wound at the naphthalene acetic acid and topped top cover fertilizer, the results of the appropriate delay topping time and topped top dressing, The root trauma increased, leaf photosynthetic intensity increased, premature senility reduced. Topping will lead to the reduction of auxin in cotton plants, leading to decreased root activity, water supply and mineral nutrition in the aerial parts of the root supply decrease, organic nutrition in the leaves is called, and its own nutritional level declines. These are not conducive to the physiological changes in vegetative growth, may be the physiological reason for the premature failure of long staple cotton.