1997～ 1999年田间试验结果表明 :不同 pH值黄泥土施用磷石膏 5 0kg/ 6 6 7m2 ,10 0kg/ 6 6 7m2 ,15 0kg/ 6 6 7m2 ,pH 4.30黄泥土玉米产量比对照增产 7.8%～ 2 2 .9% ,pH5 .0 1黄泥土增产 8.5 %～ 17.1% ,pH 5 .6 5黄砂泥土增产7.5 %～ 11.5 % ,pH 6 .0 7砂石黄泥土增产 5 .9%～ 8.3 % ,投产比值在 1∶2 .7以上。土壤 pH值随磷石膏用量增加而提高 ,土壤水解酸含量随磷石膏用量增加而降低。磷石膏适宜用量为 5 0～ 10 0kg/ 6 6 7m2 与农家肥、氮、磷、钾肥配合作底肥施用。可以认为磷石膏是一种改良酸性黄泥土的新型调理剂。 The results of field trials from 1997 to 1999 showed that the yield of maize with yellow mud soil with different pH values ​​was 0.50kg / 667m2, 100kg / 667m2, 150kg / 667m2 and pH 4.30, which increased by 7.8% 2.5% ~ 17.1% increase of pH5. 0 1 yellow soil, 7.5% ~ 11.5% increase of pH5.65 yellow sand soil, and 5-9% ~ 8.3% increase of pH6. , Put into production ratio of 1: 2 .7 above. Soil pH increased with the increasing dosage of phosphogypsum, and soil hydrolyzable acid content decreased with the increasing dosage of phosphogypsum. Phosphogypsum suitable amount of 50 ~ 10 0kg / 6 6 7m2 and manure, nitrogen, phosphorus and potassium fertilizer for the application. Phosphogypsum can be considered as a new type of conditioner to improve the acidity of yellow soil.