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棉花进入铃期,以生殖生长为主。由于光合产物大量输向蕾铃,根系的营养状况恶化,生理功能减退,造成碳、氮代谢与氮素供应上的矛盾。据报导,盛花到吐絮吸收氮素,占全生育期总量的48.9％。这时重施花铃肥,有利于伏桃和秋桃的形成和发育,是棉花“嫩过八月”、多结铃、结大铃的关键。如本阶段氮肥供给不足,叶色过早落黄,将出现早衰。但如果用肥过多、过晚,也会导致秋发、迟熟,铃重减轻,烂铃增加。
Cotton into the bell, mainly to reproductive growth. Due to a large number of photosynthetic products lost to the buds, the nutritional status of the root deteriorated, physiological function decline, resulting in carbon and nitrogen metabolism and nitrogen supply contradiction. It is reported that full bloom to the vomit absorb nitrogen, accounting for 48.9% of the total growth period. At this time re-implementation of Huaxianfei, is conducive to the formation and development of autumn peach and autumn peach, cotton is “tender past August”, more than the bell, knot big bell key. If insufficient nitrogen supply at this stage, premature yellow leaves fall, there will be premature aging. However, if you use too much fat, too late, will lead to autumn hair, late maturity, boll weight reduction, bad bell increases.