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棉花自开花至吐絮为花铃期。我省一般是7月上、中旬至9月中旬,历时约70天。其生育特点是:①生长发育最旺盛;②需肥需水最多;③营养和生殖生长相互矛盾最集中,最尖锐。棉花盛花前仍以营养生长为主,合成的养分80—90%供给主茎生长点和枝叶生长的需要。盛花后转为生殖生长占优势,合成的养分60—80%是供蕾、花、铃发育之需。棉花生育期达6个月之久,几乎有60—70%的蕾、花、铃(丘陵地更多些)是靠伏天一个多月的时间内形成的。这时棉株既扩大营养体,搭好“丰产”架子,又集中现蕾、开花、成铃,急需大量的养分。如棉花管理得当,可协调“两长”矛盾,控制盛蕾初花期疯长,促进花铃期旺盛,充分发挥多现蕾、
Cotton flowering to boll opening for the flowering period. Our province is generally July, mid-September mid-season, which lasted about 70 days. Its fertility is characterized by: ① the most vigorous growth and development; ② the most water needed fertilizer; ③ nutrition and reproductive growth contradictory most concentrated and most acute. Pre-bloom cotton is still mainly vegetative growth, synthesis of nutrients 80-90% supply to the growth point of the main stem and foliage needs. Shenghuahua turn reproductive growth dominant, synthetic nutrients 60-80% for buds, flowers, bell development needs. Cotton growth period of 6 months, almost 60-70% of the buds, flowers, bolls (more hilly) is formed by more than a month of V days. At this moment, the cotton plant not only enlarged the nutriment, but also set up the shelf of “high yield”, concentrating on budding, flowering and bells, which urgently needed a lot of nutrients. Such as cotton properly managed to coordinate the “two long” contradictions, control of early bud bloom flower crazy, to promote strong flower ring, give full play to more budding,