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1988～1994年在砂质潮土上利用坑栽长期定位试验研究的结果表明、单施N肥土壤有机质、速效磷、钾降低.NP配施,对土壤肥力有明显的改善作用,但会导致土壤钾素耗竭.土壤中NO_3-N积累量随施入土壤的氮量增加而加大,并在剖面105cm处出现明显的积累峰,单施有机肥的土壤NO_3-N在剖面分布比较均匀,而NP与有机肥配施,NO_3-N在剖面积累峰上移30～55cm.
The results of long-term experimental study on the application of pit planting in sandy soil from 1988 to 1994 showed that soil organic matter, available phosphorus and potassium decreased with the application of N fertilizers, and the application of NP could obviously improve soil fertility but could lead to Soil potassium depletion.The accumulation of NO 3-N in soil increased with the increase of nitrogen applied to the soil, and there was obvious accumulation peak at 105 cm in section.NO 3 -N in the soil with single organic fertilizer distributed more evenly in the section, NP and organic fertilizer, NO_3-N peak in the cross-sectional area shift 30 ~ 55cm.