soil organic substance 土壤有机物质
soil oganic substance 土壤有机质
soil adjuvant substance 土壤补助剂
soil poisonous substance 土壤有害物质
soil diamagnetic substance [土壤] 土壤反磁质
soil paramagnetic substance [土壤] 土壤顺磁质
soil ferromagnetic substance [土壤] 土壤铁磁质
soil active organic substance 土壤活性有机质
soil humic substance 土壤腐殖质
Soil acidization, low organic substance and effective nutrients, nutrition defect and disorder are the major problems in rubber plantations of Yunnan.
云南橡胶园土壤存在明显酸化、有机质下降、有效养分降低、缺素和营养失调等问题。
For black soil with high content of organic matter, organic cementing substance is an important factor in forming soil aggregates.
对于有机质含量高的黑土，有机胶结物质是形成土壤团聚体的主要因素。
The low resistant erosion ability of ground substance, especially in granite weathering crust and purple rock and its soil are the inner causes of severe soil erosion.
抗侵蚀性较弱的地面组成物质，特别是花岗岩和紫色岩风化壳及其土壤，是造成土壤侵蚀特别严重的内在原因；
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