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棉花生长后期根系吸收功能减弱,尤其是育苗移栽棉花根系吸收功能减退更加明显。吸收功能的减退,加上棉田养分不足或肥效发挥缓慢和遇上秋旱,是造成棉株早衰的重要原因。倘若在棉花生长后期,即进入吐絮期后适时喷施叶面肥,补充营养,有利于增产增收。 后期喷肥应全面喷施“一硼三要素营养”。喷氮保持棉株功能叶,喷磷增铃重促早熟,喷钾防治红叶茎枯病,喷硼降低脱落率、减少花而不实。
At the later stage of cotton growth, the absorption of root system weakened, especially the cotton root absorption function of transplanted cotton seedling decreased more obviously. Absorption function decline, coupled with inadequate nutrition or cotton fertilizer to play slow and encounter autumn drought, is an important reason for cotton premature senility. If the latter part of the growth of cotton, that is, after the timely introduction of boll opening foliar fertilizer, nutritional supplements, is conducive to increasing production. Late spraying should be fully sprayed “a boron three elements of nutrition.” Spraying nitrogen to maintain cotton plant function leaves, sprinkling phosphorus boll re-premature, spraying potassium to prevent stem blight, spraying boron to reduce the rate of shedding to reduce the flowering and not real.