Question

1. in order to continually use the same area of land for agriculture, some farmers apply fertilizers to improve the level of nitrates in the soil. an alternative to intensive use of fertilizer is to plow the roots of the leguminous plants back into the soil and leave the area unplanted for a season. why would a farmer plow this type of plant roots back into the soil and what would be the benefit of turning over the soil and leaving the old plant roots?

Explanation:

Leguminous plants have symbiotic relationships with nitrogen - fixing bacteria. Plowing their roots back enriches soil with nitrogen. Turning over soil aerates it and mixes nutrients.

Answer:

Plowing leguminous plant roots back enriches soil with nitrogen as these plants host nitrogen - fixing bacteria. Turning over the soil aerates it and mixes soil layers, which helps in better root growth and nutrient distribution for future crops.