Alluvial soils vary in nature from sandy loam to clay. They are generally

Alluvial soils, covering approximately 43.4% of India's land area, are formed by the deposition of sediments from Himalayan and Peninsular rivers [2]. These soils exhibit a texture ranging from sandy loam to clay and are generally characterized by high fertility [1]. Chemically, alluvial soils are typically rich in potash (potassium), lime, and phosphoric acid [1]. However, while they contain adequate phosphoric acid for many crops, they are widely recognized in Indian geography as being relatively poor in phosphorus and nitrogen compared to other nutrients [2]. Specifically, while some sources mention adequate phosphoric acid [1], the general classification for competitive exams and standard geographical texts identifies them as rich in potash but poor in phosphorus [2]. This nutrient profile makes them ideal for cultivating wheat, rice, sugarcane, and pulses when supplemented with appropriate fertilizers [3].

Sources

1. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 6: Soils > 1. Alluvial Soils > p. 5
2. [1] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 1: The Rise of Nationalism in Europe > Fig. 1.6: Alluvial Soil > p. 9
3. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 9: Agriculture > c) Soils > p. 20