Explanation:

Mixed cropping is growing two or more crops simultaneously on the same piece of land, for example, wheat + gram, or wheat + mustard, or groundnut + sunflower. This reduces risk and gives some insurance against failure of one of the crops.
Depending upon the duration, crop rotation is done for different crop combinations. The availability of moisture and irrigation facilities decides the choice of the crop to be cultivated after one harvest. If crop rotation is done properly then two or three crops can be grown in a year with good harvests.
Mixed farming is the practice of rearing animals and raising crops on the same farm.