Soil Texture and Structure

Soil texture is determined by the relative proportions of sand, silt, and clay particles in a soil. Sand particles are the largest, followed by silt particles, and then clay particles.

Soil structure refers to the arrangement of soil particles into aggregates. These aggregates can be various shapes and sizes, and they can affect the soil's porosity, water-holding capacity, and drainage.

Sand particles are the largest of the three soil texture classes. They are typically visible to the naked eye and feel gritty when rubbed between the fingers.

Clay particles are the smallest of the three soil texture classes. They are not visible to the naked eye and feel smooth when rubbed between the fingers.

Loam is a soil texture that contains a mixture of sand, silt, and clay. It is considered to be the best soil texture for plant growth because it provides a good balance of drainage and water-holding capacity.

A soil that has a high percentage of sand is called a sandy soil. Sandy soils are typically well-drained and have a low water-holding capacity.

A soil that has a high percentage of silt is called a silty soil. Silty soils are typically well-drained and have a moderate water-holding capacity.

A soil that has a high percentage of clay is called a clayey soil. Clayey soils are typically poorly drained and have a high water-holding capacity.

A soil that has a mixture of sand, silt, and clay is called a loamy soil. Loamy soils are typically well-drained and have a moderate water-holding capacity.

The term for the arrangement of soil particles into aggregates is soil structure.

The three main types of soil structure are granular, platy, and blocky.

Granular soil structure is characterized by rounded or spherical aggregates.

Platy soil structure is characterized by flat or plate-like aggregates.

Blocky soil structure is characterized by angular or blocky aggregates.

Massive soil structure is characterized by a lack of distinct aggregates.