1. Alluvial soils (Entisols)
- These are most important from agriculture point of view.
- Alluvial soils are formed mainly due to silt deposited by rivers.
- In coastal regions, some alluvial deposits are formed due to wave action.
- The parent material of these soils is of transported origin.
- The soil is porous because it has about equal proportions of sand and clay (loamy), but clayey soils are not uncommon.
- While they are generally low in Nitrogen, the proportion of Potash, Phosphoric Acid and alkalies are adequate.
- They are best suited to irrigation and respond well to canal and well/tube-well irrigation.