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通过对麦、稻、棉、油四种作物的土壤磷钾肥系数及磷钾肥临界值测定田间试验，经过分析后确定了麦—棉—麦、麦—稻—油、油—稻—麦—棉三种轮作方式下轮作周期内的磷钾肥合理分配原则，即在麦—稻—油轮作周期内，磷肥钾肥均应优先施于小麦上，其次施于油菜上；在麦—棉—麦轮作周期内，磷肥应优先施于棉花上，钾肥应优先施于小麦上；在油—稻—麦—棉轮作周期内，磷肥应优先施于棉花上，其次施于小麦、油菜上，钾肥应优先施于小麦上，其次施于油菜、棉花上。从而为生产上指导科学施用磷钾肥和提高磷钾肥经济效益提供科学依据。
Through field experiments on the determination of P and K fertilizers and the critical value of P and K in wheat, rice, cotton and oil crops, wheat-cotton-wheat, wheat-rice-oil, oil-rice-wheat- cotton Under the three cropping patterns, the principle of reasonable allocation of phosphorus and potassium in the crop rotation cycle was that the phosphate fertilizer and potassium fertilizer should be applied preferentially to wheat and then to the rapeseed during the wheat-rice-oil rotation cycle. In the wheat-cotton-wheat rotation cycle In the oil-rice-wheat-cotton rotation cycle, phosphorus should be given priority to the cotton, followed by applied to wheat, rapeseed, potassium should be given priority In wheat, followed by applied to rapeseed, cotton. Thus providing a scientific basis for guiding the scientific application of P and K fertilizer in production and improving the economic benefits of P and K fertilizer.