Correct Answer: (b) Calcium
Solution:The districts of Jaisalmer, Bikaner, Barmer, Jalore, Jodhpur, Ganganagar, Sirohi, Jhunjhunu, Pali and Sikar of western Rajasthan have alkaline and saline soils with a calcareous base. There is some nitrate concentration in the soil of these regions. Hence, soils of western Rajasthan have a high content of calcium.
