soil K土壤钾素soiln.土地；土壤；污物，粪便v.弄污soil plastic film地膜soil bacteriology土壤细菌学soil available Ni土壤有效态Nisoil microelement土壤微量元素soil distribution土壤分布soil microanimals土壤小型动物soil bank program土壤银行计划soil redox system土壤氧化还原体系soil-disc model土盘模型soil-nail walls土钉墙