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经过长期定位试验，建立土壤速效磷与农肥、化肥、秸秆关系的数学模型并探讨作物生育后期土壤速效磷合量的变化规律。分析表明，作物生育后期，土壤速效磷含量随农肥用量增加而呈上升趋势；而化肥效益随着用量的增加而迅速下降；在农肥、化肥用量较高时，秸秆的效果较好；农肥、化肥用量较低时，效果不明显，农肥、化肥、秸秆之间存在着明显的正文互作用。
After long-term experiment, the mathematical model of relationship between soil available phosphorus and crop fertilizer, chemical fertilizer and straw was established and the variation law of soil available P content in late crop growth stage was discussed. The results showed that the content of available phosphorus in the soil increased with the increase of the amount of agricultural fertilizer in the later stage of crop growth, while the benefit of chemical fertilizer decreased rapidly with the increase of the amount of fertilizer. The effect of straw was better when the amount of fertilizer and fertilizer was higher. When the dosage is low, the effect is not obvious, and there is a clear textual interaction between fertilizer, fertilizer and straw.