Why is the requirement of nitrogen less in pulse crops like soybean?

A bacterium called Rhizobium is found in the root nodules of leguminous crops, such as soybeans, which fix atmospheric nitrogen and make it available to the crop. Rhizobium is a nitrogen-fixing bacterium. It is present on the roots of leguminous crop plants and converts atmospheric nitrogen into a form that can be used by the plant.
It is a helpful bacterium for farmers, it helps the plants to grow well. It helps the plants to perform well in various life processes like respiration etc. Its use increases the yield of pulses by 50-60%. With the use of Rhizobium culture, about 30-40 kg of nitrogen per hectare increases in the soil.
Hence, in pulse crops, no additional nitrogen is required. After harvesting pulses, their residues help in maintaining the nitrogen content in the soil. This reduces the use of nitrogen fertilizers in the production of the next crop.

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Hence, in pulse crops, no additional nitrogen is required. After harvesting pulses, their residues help in maintaining the nitrogen content in the soil. This reduces the use of nitrogen fertilizers in the production of the next crop.