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在河北平原潮土区，就５种氮磷复（混）合肥料对小麦、玉米的增产效果进行了研究。结果表明，小麦、玉米施用氮磷复（混）合肥料后分别增产４０％～７０％和３０％～６０％。其中磷酸一铵增产效应最大，硝酸磷肥增产效应最小。５种肥料对小麦的增产作用大小为：磷酸一铵＞（尿素＋重钙）＞磷酸二铵＞（尿素＋普钙颗粒）＞硝酸磷肥；对玉米的增产作用大小为：磷酸一铵＞磷酸二铵＞（尿素＋重钙）＞（尿素＋普钙颗粒）＞硝酸磷肥。
In the tidal flat area of Hebei Plain, the effects of five kinds of nitrogen and phosphorus compound fertilizer on the yield increase of wheat and corn were studied. The results showed that the yields of wheat and maize increased by 40% -70% and 30% -60% respectively after application of N and P complex fertilizer. Among them, the yield of monoammonium phosphate was the largest, and the yield of nitrophosphate was the lowest. The effects of five kinds of fertilizers on wheat yield were as follows: monoammonium phosphate> (Urea + TSP)> DAP> (Urea + PFA)> Nitrophosphate Diammonium> (Urea + TSP)> (Urea + Pu calcium particles)> Nitrophosphate.