花生-甘薯轮作制中磷钾肥施肥模型研究

Phosphate and Potassium Fertilizer Application Model in Peanut and Sweet Potato Rotation

本文探讨了花生-甘薯轮作制中钾肥和磷钾肥施肥模型的建立方法。通过裂区田间试验设计,建立了钾肥和磷钾肥当季施肥模型和甘薯后效模型以及甘薯当季施肥模型。3个钾肥试验和2个磷钾肥试验结果表明,上述模型能很好地拟合田间试验结果。后效模型可计算出花生磷钾肥最佳施用量下对甘薯的后效产量,甘薯当季肥效模型可求得扣除肥料残留效应后的磷钾肥最佳施用量,降低了甘薯推荐施肥量,提高了施肥效益。

This article deals with phosphate and potassium application models in peanut and sweet potato rotation.According to the results of three potassium trials and two phosphate and potassium trials in peanut and sweet potato rotation, the three models can fit with the trial's yield very well. Aftereffect yield of sweet potato under the optimum P and K fertilizer application in peanut may be obtained from the aftereffect model. This recommendation application rate can be reduced and the fertilizer's benefit can be increased.