Question

Black soil is rich in ____
A. Calcium Carbonate
B. Magnesium
C. Potassium & lime
D. All of these

Answer 1

Hint:
 Black soils are mineral soils that have a black surface outlook, raised with organic carbon that is at least 25 cm deep. In India black soil is rich in Iron, Magnesium, and Aluminum.

Complete solution:
As we know there are many types of soils. It can be differentiated into 3 primary types based on its texture – sand, silt, and clay. So all the types have different characteristics. They may contain mineral particles, organic matter, water, and air. Solis properties are its texture, structure, porosity, chemistry, and colour. One of the types of soil is black soil. It is rich in metals such as Iron, Magnesium, and Aluminum India. Nevertheless, it lacks Nitrogen, Phosphorous, and Humus. due to its iron oxide content, it has a red colour. Other characteristics are swelling (during the wet period) and shrinkage (dry period). During shrinkage, It creates very deep cracks between 30-45cm. compared to other soil field preparations takes a longer time in black soil. Only after secondary farm work, the soil is suited for crop production. Black soil contains a high proportion of Calcium and Magnesium carbonates. It holds moisture for a long time. The soils are with more cation exchange capacity. Crops plough from black soli are Rice, Ragi, Sugarcane and Cashew nuts, etc. It formed as a result of high filtering and found in the areas of high rainfall.

Hence, the correct answer is option D.

Note:
In India, black soil shares 15 % of all types of soil. Volcanic rocks and lava-flow are made up of these soils. It is founded over the Deccan Lava Tract which includes parts of Maharashtra, Chhattisgarh, Madhya Pradesh, Gujarat, Andhra Pradesh, and Tamil Nadu.