• Alluvial soils are rich in potash and lime but generally lack nitrogen and phosphorus.
  • Black (Regur) soils are high in lime, iron, magnesia, and potash but low in nitrogen, phosphorus, and organic matter.
  • Red soils contain iron and potash but are deficient in nitrogen, phosphorus, and humus.
  • Laterite soils have abundant iron oxide and potash but lack organic matter, nitrogen, phosphate, and calcium.
  • Arid and desert soils contain soluble salts and phosphates but lack humus and nitrogen.
  • Saline and alkaline soils are rich in sodium, potassium, and magnesium but deficient in nitrogen and calcium.