ISO 11275:2004规定了在土壤中同时测定非饱和导水率和土壤保水特性的实验室方法。它仅适用于干燥或解吸曲线的测量。该方法仅适用于尽可能均质的土壤样品。该方法不适用于基质水头0 cm至-800 cm范围内收缩的土壤。 电导率的测定范围取决于土壤类型。它位于大约-50厘米和-700厘米的母体头部之间。 保水特性的测定范围介于约0 cm和- 800厘米。

ISO 11275:2004 specifies a laboratory method for the simultaneous determination in soils of the unsaturated hydraulic conductivity and of the soil water-retention characteristic. It is applicable only to measurement of the drying or desorption curve. Application of the method is restricted to soil samples which are, as far as possible, homogeneous. The method is not applicable to soils which shrink in the range of matric head 0 cm to -800 cm. The range of the determination of the conductivity depends on the soil type. It lies between matric heads of approximately -50 cm and -700 cm. The range of the determination of the water-retention characteristic lies between matric heads of approximately 0 cm and -800 cm.