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。

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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。

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Organic substance and physical clay of soil are important basis for index division.

其中，土壤有机质和物理性粘粒是重要的指标划分依据。

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