一、棉花吐絮期的生育特点棉花吐絮期是指棉铃发育、充实直至成熟吐絮的阶段,此期营养生长逐步停止。黄淮海棉区麦套短季棉一般在9月中下旬开始吐絮,持续一个月左右。此期气温逐渐降低,棉株枝叶生长变慢直至停止;叶片的光合作用功能由下至上逐步减弱,地下根系吸收能力也渐趋减弱,棉株体内90%以上的养分供棉铃发育。因此,此期的营养状况对增加铃重,特别是增加中上部铃重至关重要,田间管理仍不容忽视。 First, the cotton boll opening period characteristics of cotton boll opening Cotton boll stage refers to the development of cotton bolls, filling up until the stage of mature boll flow, this period of vegetative growth and gradually stop. Huang-Huai sponge cotton short-seeding cotton generally in mid to late September began to flocculent, lasted a month or so. During this period, the temperature gradually decreased, the growth of cotton plant branches slowed down until it stopped; the function of photosynthesis of leaves gradually weakened from bottom to top, and the absorptive capacity of underground roots also weakened gradually. More than 90% of nutrients in cotton plants were provided for boll development. Therefore, the nutritional status of this period is very important for increasing boll weight, especially for increasing middle and upper boll weight. Field management should not be neglected.