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Plastic limits of agricultural soils as functions of soil texture and organic matter content

机译：农业土壤的塑性极限与土壤质地和有机质含量的关系

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The plastic limits (lower plastic limit, PL; and liquid limit, LL) are important soil properties that can yield information on soil mechanical behaviour. The objective of this paper is to study the plastic limits of agricultural soils as functions of soil texture and organic matter (OM) content. The plastic limits were highly related to the clay content. The LL was more strongly correlated with clay than was PL, but the reasons are unclear. Interestingly, PL was virtually unaffected by clay content for soils with clay contents below similar to 35%. The OM had a strong effect on the plastic limits. This effect was clearly demonstrated when analysing soils of similar texture with a range of OM. We present equations (pedotransfer functions) for estimation of PL, LL, and plasticity index (PI) from soil texture and OM. Finally, we predict that the clay content must be >= 10% for soils without OM to be plastic; however, soils with <10% clay can be plastic if OM is present. More research is needed to investigate OM effects on soil consistency.
机译：塑性极限（较低的塑性极限PL和液体极限LL）是重要的土壤特性，可以提供有关土壤力学行为的信息。本文的目的是研究农业土壤的塑性极限与土壤质地和有机质（OM）含量的关系。塑性极限与粘土含量高度相关。 LL与粘土的相关性高于PL，但原因尚不清楚。有趣的是，对于粘土含量低于35％的土壤，PL几乎不受粘土含量的影响。 OM对塑性极限有很大影响。当分析一系列具有OM的相似质地的土壤时，可以清楚地证明这种效果。我们提出了从土壤质地和土壤中估算PL，LL和可塑性指数（PI）的方程式（pedotransfer函数）。最后，我们预测对于不含OM的土壤，其粘土含量必须> = 10％;但是，如果存在OM，则粘土含量小于10％的土壤可以变成塑料。需要更多的研究来研究OM对土壤稠度的影响。

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