Soil pH土壤pHsoiln.土地；土壤；污物，粪便v.弄污soilandwater conservation水土保持soil-plant system model夏玉米soil moisture observation土壤湿度观测soil and reck engineering岩土工程soil shear failure around土体剪切破坏soil and nutrients losses紫色土坡地soil pressure calculation土压力soil water content sensor土壤水分传感器soil foundation treatment地基处理soil phosphatase activity土壤磷酸酶活性