Crop rotation is a way of growing different kinds of crops in the same area in consecutive seasons. There are a lot of benefits that the soil can get through crop rotation. One of the benefits that you can get in crop rotation is the replenishment of nitrogen in the soil.
1. Balances the fertility of the soil
The crops that you plant affect the soil balance differently. Different crops need various nutrients. Crops like corn and tomatoes can easily reduce the phosphorus and nitrogen in the soil because they are heavy feeders. If you plant these crops in the same area year after year, the nitrogen and phosphorus in the soil will diminish more quickly. You must change the location of these crops each year, by doing this you will be able to renew the area where these crops grew the previous year and you will maintain the balance of your soil.
Lettuce, cabbage, tomatoes and some leafy crops are also heavy feeders. They consume nitrogen very fast. Root vegetables and herbs are considered as light feeders. There are crops that adds nitrogen to the soil but consume a lot of phosphorus such as peas and beans.
The most important factor in balancing the fertility of the soil is to avoid planting similar crops in the same area. You can plant nitrogen-fixing legumes (peas and beans) and nitrogen-loving crops (lettuce and tomatoes) alternately each year. You can also plant heavy feeding crops and light feeding crops alternately each year.