SOIL TEXTURE

SOIL TEXTURE

• Soil texture refers to the relative proportions of various types

of soil particles. OR

• It is refers to the size of the soil particles.

• It is basic property of a soil, it can't be changed.

Mechanical analysis of soil separates i.e. the percentage of sand,

silt and clay is done by Hydrometric method.

Classification of soil particle size:

Classification According to IISS

Soil partical	(dia. in mm)
Gravel	>2.0
Coarse sand	0.2 - 2.0
Fine sand	0.02 - 0.2
Silt	0.02 - 0.002
Clay	< 0.002

*humus partical size <0.0002

Textural classes:

• Sandy soil: Soil contains more than 85% sand.

• Silt soil: When more than 80%silt.

• Clay soil: When more than 40% clay.

• Clay soils have highest pore space then other.