[Objective] The soil of Tianjin coastal saline-alkali was cultivated to choose a better drainage scheme,and it can provide theoretical basis for the improvement of coastal saline-alkali soil.[Method] The phosphogypsum,PAM,organic garden waste were adopted as ameliorants to improve the property of coastal saline-alkali soil in Tianjin by using three factors and three level orthogonal variance analysis.[Result]Different treatments could reduce soil salinity in different degrees,increase nutrient content.Among the factors that the most significant effect on soil salinity index was phosphogypsum,the best formula was A2B1 C2.The most significant effect on soil structural indicators was PAM and organic garden waste,the best formula was A2 B1 C1.The most significant effect on soil nutrient index was organic garden waste,the best formula was A3B2 C3.[Conclusion] The recipe(A2 B1 C2) of phosphorus gypsum,PAM and organic garden waste compounds had the best effect on the improvement of saline-alkali soil.%[目的]对天津滨海盐碱土进行培养,筛选出较佳的改良方案,为滨海地区盐碱土的改良提供理论依据.[方法]利用磷石膏(A)、聚丙烯酰胺(B)、园林废弃有机物(C)3种改良剂,通过3因素3水平正交设计,研究组合改良剂对天津滨海盐碱土的改良效应.[结果]不同处理均能不同程度地降低土壤盐分含量,增加养分含量.其中对土壤盐分指标有显著影响的因素是磷石膏(A),最佳方案是A2B1C2;对土壤结构指标有显著影响的因素是聚丙烯酰胺(B)与园林废弃有机物(C),最佳方案是A2B1C1;对土壤养分指标有显著影响的因素是园林废弃有机物(C),最佳方案是A3B2C3.[结论]磷石膏、PAM、园林废弃有机物对盐碱土改良效果的最佳配方为A2B1C2.
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