crpo rotation is used by the farmers to increase

1. nitrogenous content of the soil
2. organic content of the soil
3. soil fertility
4. oll of these

Crop rotationis the practice of growing a series of dissimilar/different types ofcropsin the same area in sequentialseasons.
Crop rotation gives various nutrients to the soil. A traditional element of crop rotation is the replenishment ofnitrogenthrough the use ofgreen manurein sequence with cereals and other crops. Crop rotation also mitigates the build-up ofpathogensand pests that often occurs when one species is continuously cropped, and can also improvesoil structureandfertilityby alternating deep-rooted and shallow-rooted plants. Crop rotation is one component ofpolyculture. So the correct ans is option 4.