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七十年代以来,氮素化肥在棉田施用量每亩高达20至25公斤纯氮,施用次数一般6—8次,施用方法多表施,并且忽视有机肥及磷、钾肥的施用。由此造成棉株高、大、空、迟,秋桃、烂铃增加,棉花品质下降,浪费肥料及劳力,经济效益差。针对这一问题,1981—1984年在湖北集中产棉区的不同类型和肥力土壤上,进行棉花氮肥用量多点试验。研究不同施氮量对棉花增产增收的效果。力求在近期内筛选出大面积亩产皮棉60—75公斤,省肥、省工、增产增
Since the seventies, nitrogenous fertilizer has been applied in cotton fields up to 20-25 kilograms of pure nitrogen per mu. The application times are generally 6-8 times. The application methods are given in many forms and the application of organic manure and phosphorus and potassium fertilizer are neglected. The resulting cotton plant height, big, empty, late, autumn peach, bad bell increased, cotton quality declined, waste of fertilizers and labor, poor economic efficiency. In response to this problem, in 1981-1984 in Hubei Province, different types of cotton-growing areas and fertile soil, cotton nitrogen fertilizer use more points. Study on the effects of different amount of nitrogen on cotton yield increase. In the near future, we will strive to screen a large area of 60-75 kilograms of lint per mu, save fertilizer, save labor and increase production