题目内容

The volume of cutting ring is 100 cm3, the mass of wet soil inside is 160 g, its mass water content is 25%, the bulk density is g/cm3, volumetric water content is %.

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To plants, only part of the membranous water is available.

Soil bulk density refers to the mass of solid soil particles per unit volume. The volume does not contain space between particles.

Soil particle size classes are different groups of soil particles which are classified based on the property and size of soil particles. Soil particles in the same group share similar composition and properties. There are clear distinctions between different size groups. Each such group is called a size class.

Soil mechanical composition refers to the designations given to soils after classification based on the fact that soils with similar contents of particles in given size classes share similar properties and soils with similar mechanical compositions share similar fertility.