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连续１０年的定位试验结果表明，灰棕紫泥田在麦稻稻三熟利用强度下，施用磷肥和钾肥均未表现出对作物的明显增产效应。这一方面说明，灰棕紫泥田具有较强的供磷、供钾能力；同时也说明，紫泥田是一个大的土类，因成土母质类型复杂，对肥料的反应是有很大差别的。当前，灰棕紫泥田进行稻、麦栽培时，配方施肥的磷肥、钾肥比例可适当偏低，或主要通过有机肥的施用和秸秆还田，以维持土壤钾素含量稳定在一定水平上。
The results of 10 years of continuous positioning experiments showed that the application of P and K fertilizers did not show a significant increase effect on crop yield in gray brown purple soil under the third-intensity utilization of wheat and rice. On the one hand, gray brown purple soil has strong phosphorus supply, potassium supply capacity; also shows that purple soil is a large soil class, due to the type of soil parent material complex, the response to fertilizer is very different . At present, the ratio of P and K fertilizers in the treatment of rice and wheat cultivation in gray brown purple soil can be moderately low or mainly through the application of organic manure and straw return to maintain the stability of soil potassium content to a certain level.