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unavailable water 無效水(分)。

unavailing

The empirical equation w = asb was used to fit water holding capacity of four kinds of agricultural soils in loess plateau . soil water holding capacity and unavailable water content increased as soil texture became clayed . available water content in loam was higher than those in sandy soil and clayed soil 黃土高原四種主要農業土壤的水分特征曲線并無明顯的平臺或拐點產生,其關系能夠很好地用garden經驗方程( w = as ~ ( - b ) )進行擬合。