Consider the following characteristics of a soil type: 1. These soils consist of various proportions of sand, silt and clay. 2. These soils contain adequate proportions of potash, phosphoric acid and lime. 3. These soils can be further classified on the basis of their age. Identify the type of soil on the basis of the given characteristics.

The characteristics described correspond to Alluvial soil. These soils are formed by the deposition of sediments by rivers and consist of varying proportions of sand, silt, and clay [1]. Chemically, alluvial soils are generally rich in potash, phosphoric acid, and lime, which makes them highly fertile and suitable for the growth of crops like sugarcane, paddy, and wheat. A unique feature of alluvial soil is its classification based on age; it is divided into 'Bangar' (old alluvium) and 'Khadar' (new alluvium) [2]. While Bangar contains higher concentrations of calcareous nodules (kanker), Khadar is more fertile and fine-grained [1]. Other soil types like Laterite are formed by leaching and are deficient in lime and potash [2], while Black soil is primarily clayey and lacks phosphoric acid.

Sources

1. [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
2. [2] https://www.kharagpurcollege.ac.in/studyMaterial/52445Indian-Soil-Geography-semester-III-07-09-2020.pdf