吐絮期是指棉铃开始吐絮到收花结束的一段时期。是棉花整个生育过程的最后阶段,一般70—80天。其生育特点是:伏桃正在逐步成熟,秋桃陆续形成,营养生长已经停止,生殖生长逐渐减慢,根系吸收能力及一系列生理机能日渐下降,对水分养分的需求明显减少。一般不易徒长,但易出现早衰。为争取秋桃发育良好,仍需施一定的肥料,提供相当的水分。因此,吐絮期的管理中心是防止早衰,丰产田防贪青晚熟。具体措施是: 1、适当朴水补肥。对秋旱严重的地块,必须及时浇水,否则会影响棉铃的长大成熟。采取小水沟灌为宜。如显脱肥,沙薄地可每亩追肥2.5公斤左右尿素,土质较好的地,可喷施1％的尿素溶液和 Boll boll flowering is boll cotton boll to the end of the period of income. Cotton is the final stage of the entire reproductive process, usually 70-80 days. Its fertility is characterized by: Fading peach is gradually maturing, autumn gradually formed, vegetative growth has stopped, reproductive growth gradually slowed down, the root absorption capacity and a series of physiological functions decreased, the demand for water and nutrients decreased significantly. Generally not easy to leggy, but prone to premature aging. In order to strive for good development of autumn peach, still need to apply a certain amount of fertilizer to provide considerable moisture. Therefore, boll opening period management center is to prevent premature aging, high yield field anti-greedy late-maturing. Specific measures are: 1, appropriate water supplement fertilizer. On the autumn drought severe plots, must be timely watering, otherwise it will affect the growth and maturity of cotton bolls. Take a small irrigation ditch appropriate. Such as was Tuozhuo, thin sand per acre top dressing of about 2.5 kilograms of urea, soil better, can spray 1% urea solution and