Sign In Question: Arrange the following soils of India as per soil classification of USDA by ICAR in decreasing order of their area coverage:
🔑Key Points:
Soil Orders
-There are several levels of soil taxonomy and those are order, suborder, great group, subgroup, family, and series. The classification was originally developed by Guy Donald Smith, former director of the U.S. Department of Agriculture’s soil survey investigations (Donovan and Alan, 1981).
-Soil order is the most general level of classification in the USDA (United States Department of Agriculture) system of Soil Taxonomy.
ENTISOLS
-Entisols cover about 16% of the world’s ice-free land surface.
-These occur in areas recently deposited parent materials or in areas where erosion or deposition rates are faster than the rate of soil development; such as dunes, steep slopes, and flood plains. They occur in many environments. The soils show little or no evidence of pedogenic horizon development.
AlfisolsÂ
-Alfisols cover about 12% of the world’s ice-free land surface.
-These soils result from weathering processes. They leach clay minerals and other constituents out of the surface layer and into the subsoil where they can retain and supply moisture and nutrients to plants. They are primarily formed under forest or mixed vegetation cover and are very much productive for most crops.
 AridisolsÂ
-Aridisols makes up about 10% of the world’s ice-free land surface.
-These soils are too dry for the growth of mesophytic plants.
-The lack of moisture greatly restricts the intensity of weathering processes and limits most soil development processes to the upper part of soils. The soils often accumulate gypsum, salt, calcium carbonate, etc.
 Ultisols
-Ultisols make up about 8% of the world’s ice-free land surface. The soils are in humid areas.
-They formed from fairly intense weathering and leaching processes. They are basically acid soils in which most nutrients are concentrated in the upper few inches. They have a moderately low capacity to retain additions of lime and fertilizer.
Soil Orders
-There are several levels of soil taxonomy and those are order, suborder, great group, subgroup, family, and series. The classification was originally developed by Guy Donald Smith, former director of the U.S. Department of Agriculture’s soil survey investigations (Donovan and Alan, 1981).
-Soil order is the most general level of classification in the USDA (United States Department of Agriculture) system of Soil Taxonomy.
ENTISOLS
-Entisols cover about 16% of the world’s ice-free land surface.
-These occur in areas recently deposited parent materials or in areas where erosion or deposition rates are faster than the rate of soil development; such as dunes, steep slopes, and flood plains. They occur in many environments. The soils show little or no evidence of pedogenic horizon development.
AlfisolsÂ
-Alfisols cover about 12% of the world’s ice-free land surface.
-These soils result from weathering processes. They leach clay minerals and other constituents out of the surface layer and into the subsoil where they can retain and supply moisture and nutrients to plants. They are primarily formed under forest or mixed vegetation cover and are very much productive for most crops.
 AridisolsÂ
-Aridisols makes up about 10% of the world’s ice-free land surface.
-These soils are too dry for the growth of mesophytic plants.
-The lack of moisture greatly restricts the intensity of weathering processes and limits most soil development processes to the upper part of soils. The soils often accumulate gypsum, salt, calcium carbonate, etc.
 Ultisols
-Ultisols make up about 8% of the world’s ice-free land surface. The soils are in humid areas.
-They formed from fairly intense weathering and leaching processes. They are basically acid soils in which most nutrients are concentrated in the upper few inches. They have a moderately low capacity to retain additions of lime and fertilizer.
Login with Google