In autumn, peas are sown on the depleted soil. This is not done for the sake of fruiting. What is the reason for this event?

In autumn, peas are sown on the depleted soil. This is not done for the sake of fruiting. What is the reason for this event? Why is a plant of this family used?

1) this is done to increase soil fertility for the next growing season;
2) peas belong to plants of the legume family, which form a symbiosis with nitrogen-fixing bacteria (assimilate molecular nitrogen of the air and convert it into forms accessible to plants).

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