MCQ
Q.
In Rajasthan, brown soil is found in
Correct Answer: A
Soil is one of the most important natural resources as mankind is dependent on soil for food. The soils of Rajasthan have developed under the arid and humid climate over the bedrocks of complex nature predominately through the process of Lateralization.
Classification: The old system of classification was developed by scientists (Thorpe & Smith) of the U.S Department of Agriculture in 1949. The classification is based upon differences in climate and mineralogy. As per this system, soils of Rajasthan can be classified into 8 types:
- Desert Soils
- Dunes and Associated Soils
- Brown Soils
- Sierozems
- Red Loams
- Hill Soils (Lithosols)
- Saline Sodic Soils (Solonchaks)
- Alluvial Soils/and Black Soils
Brown soil:
- Brown Soils
Major area of these soils is in the catchment area of Banas River. - Districts – Tonk, Bundi, Sawai Madhopur, Bhilwara, Udaipur, and Chittorgarh
- Annual Rainfall – 50 cm to 75 cm is sufficient for Kharif crops.
- Texture – Sandy loam to clay loam.
- Colour – Ranges from greyish brown to yellow-brown.
- They are rich in calcium salts but have poor organic matter
- The use of fertilizers becomes essential to get a good harvest
- As the groundwaters are saline, soils irrigate with these waters have accumulated salts
- Tank irrigated soils have also developed a problem of the high water table.
- Rabi crops are grown under irrigation.
Hence, option 1 is the correct answer.
