The great diversity in landforms, geological formations and climate conditions in India has resulted in a large variety of soils. Apart from a few soil orders (Andisols and Spodosols), all the major soils of the world are represented in India. Broadly, Indian soils consist of eight major groups, of which four are of agricultural importance: alluvial soils, black soils, red soils and lateritic soils. The four other broad soil groups that occur fairly extensively in India are: saline and sodic soils, desert soils, forest and hill soils, and peaty and marshy soils. These soil groups are related closely to the geographical character and the climate of the regions in which they occur.
Alluvial soils constitute the largest and most important soil group of India and contribute most to the agricultural wealth of the country. The soils are derived from the deposition of silt by the numerous river systems. They cover about 75 million ha in the Indo-Gangetic Plains (IGP) and Brahmaputra Valley and are distributed in the states of Punjab, Haryana, Uttaranchal, Uttar Pradesh, Bihar, West Bengal, Assam and the coastal regions of India. These soils are deficient in nitrogen (N), phosphorus and organic matter. Generally, alluvial soils range from near neutral to slightly alkaline in reaction. A wide variety of crops is grown in these soils.
Black soils are very dark and have a very high clay content. They have a high moisture retention capacity. They become extremely hard on drying and sticky on wetting. Hence, they are very difficult to cultivate and manage. These soils cover an area of about 74 million ha, mainly in the central, western and southern states of India. They are inherently very fertile. Under rainfed conditions, they are used for growing cotton, millets, soybean, sorghum, pigeon pea, etc. Under irrigated conditions, they can be used for a variety of other crops, such as sugar cane, wheat, tobacco and citrus crops.
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