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为进一步了解棉花对氮磷钾三要素的要求,掌握氮磷化肥施用时期,1982—1985年开展了此项研究。研究的指导思想是根据棉区土壤养分含量情况及施肥问题,为获得亩产皮棉75—100公斤进行的试验设计。
In order to know more about the requirements of NPK for cotton and master the period of nitrogen and phosphorus fertilizer application, this study was carried out from 1982 to 1985. The guiding ideology of the study is to design a trial of 75-100 kg per mu lint on the basis of soil nutrient content and fertilization in cotton area.