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甘薯的适宜种植密度和施氮量有利于实现高产，但两者间的显著交互作用所形成的高产区间说明种植密度与施氮量间存在着合理配合的问题。种植密度与施氮量的增产效应和经济效益分析表明：在人多地少、土地资源不足的地区应选用边际利润值０．２～０．５时的密度和施氮量组合，实现高产高效，反之，可选用更高边际利润值下的密度和施氮量组合使有限的资金、劳力获得更大的边际利润。
The suitable planting density and nitrogen application rate of sweet potato are good for high yield, but the high yield interval formed by the significant interaction between the two shows that there is a reasonable cooperation between planting density and nitrogen application rate. The effects of planting density and nitrogen application rate on yield increase and economic benefit show that the combination of density and nitrogen application with marginal profit value of 0.2 ~ 0.5 should be selected in the areas where the population is small and the land resources are insufficient, so that high yield and high efficiency On the other hand, the combination of density and nitrogen application at higher profit margins can make the limited capital and labor more marginal profits.