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１９８６年开始按全国化肥网统一方案进行不同氮磷化肥品种的定位试验。结果表明，４种氮磷复混肥之间的产量差异未达显著平准。氮磷的利用率大小顺序为硝酸磷肥＞尿素普钙＞尿素磷铵＞氯化铵磷铵。硝酸磷肥和普钙、重钙对土壤速效磷有明显的积累效果。不同肥料品种对土壤有效Ｎ、Ｋ影响不大。施肥处理土壤ｐＨ略有下降。连续８年施用氯化铵，耕层Ｃｌ－浓度没有明显增加，在２０～６０ｃｍ土层中有积累。几种肥料对作物品质没有明显的不良影响。
In 1986, according to the unified plan of national fertilizer network, different types of nitrogen and phosphorus fertilizer were tested. The results showed that the yield differences between the four nitrogen and phosphorus compound fertilizers did not reach significant level. Nitrogen and phosphorus utilization in the order of nitrophosphate fertilizer> urea calcium> urea ammonium phosphate> ammonium chloride ammonium phosphate. Nitric acid phosphate and calcium, heavy calcium on soil available P significant accumulation effect. Different types of fertilizer on soil available N, K little effect. Fertilization soil pH decreased slightly. Ammonium chloride was applied for 8 consecutive years without any significant increase in the Cl- concentration in the topsoil and in the 20-60 cm soil layer. Several fertilizers have no significant adverse effect on crop quality.