通过大田试验，研究了磷石膏改良盐碱地效果及对玉米农艺性状、产量的影响。结果表明，玉米产量以施入磷石膏3 000 kg/hm2处理最高，为10 881.63 kg/hm2，较不施磷石膏处理增产4.96%，但处理间产量差异不显著。施入磷石膏后改善土壤质量的效果显著，可显著增加土壤有机质0.1～7.4 g/kg、速效氮5～26 mg/kg、有效磷1～2 mg/kg、速效钾含量8～32 mg/kg。可显著降低耕层pH 0.04～0.46。脱盐效果明显，施入磷石膏3000～4500 kg/hm2的处理，水溶性盐的含量降低到了1 g/kg以下。通过土壤脱盐，释放出了土壤中被固定的各种养分，提高了土壤中有机质、速效氮、有效磷、速效钾的含量，达到改良风沙土盐碱地的目的。

Through field experiment, the effect of phosphogypsum on improving saline-alkali soil and its effect on agronomic characters and yield of corn were studied. The results showed that the yield of corn was the highest with 3 000 kg/hm2 of phosphogypsum, which was 10 081.63 kg/hm2， 4.96% higher than that without phosphogypsum， but there was no significant difference between treatments. The application of phosphogypsum can significantly improve soil quality. It can significantly increase soil organic matter 0.1～7.4 g/kg, available nitrogen 5～26 mg/kg, available phosphorus 1～2 mg/kg and available potassium 8～32 mg/kg. It can significantly reduce the pH value of plough layer from 0.04 to 0.46. The effect of desalination is obvious. The content of water-soluble salt is reduced to less than 1 g/kg by applying phosphogypsum 3 000～4 500 kg/hm2. Through soil desalination, the fixed nutrients in the soil are released, and the contents of organic matter, available nitrogen， available phosphorus and available potassium in the soil are increased, so as to improve the saline-alkali land of aeolian sandy soil.

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