Cereals and legumes are cultivated alternatively in crop rotation process by a farmer. Which of the following are advantages of cultivating cereals and legumes alternatively?

The correct option is D All of the above

Cultivation of cereals followed legumes in a cultivated soil is called crop rotation. In this, Legumes have bacteria on nodules which are on the roots of the plant. The bacteria on the nodules takes nitrogen from the air and fixes it into the soil, so that other plants that require nitrogen can use it as well. Farmers use soybeans and other legumes in rotations with grass crops such as corn or wheat. Grass crops are unable to take their own nitrogen from the air so they either need the nitrogen in the soil that the legumes provide for them in a crop rotation or they need a chemical fertilizer containing nitrogen.

So the correct option is ' All of the above ' .