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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.

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The granular structure is nearly spherical. It is loose inside and course on the surface, usually in diameter of 0.25 to 10 mm. The granular structure is the most ideal soil structure.

Soil tilth refers to a series of physical and mechanical properties reflected in soil tillage.

Rainfall, irrigation, human and animal trampling, and mechanical compaction all can compact the soil and reduce the porosity. Deep plowing and applying organic fertilizer both increase soil porosity.

Planting green manure crops is an effective measure for increasing soil organic matter and improving soil structure. Green manure crops have developed roots with strong penetration. They have strong cutting and extrusion effect on subsoil. Meanwhile, the earthworms and other animals in subsurface soil can together make the compacted soil become looser.