soil K土壤钾素soiln.土地；土壤；污物，粪便v.弄污soil degeneration土壤退化soil conservationn.土壤保持soil erosion zone土壤侵蚀带soil forming rock成土母岩soil-water body土壤-水体soil densitometer土壤密度计soil liquefaction地基液化soil plate method土壤平板法soil contaminates土壤污染Soil water status土壤含水量