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Your advice is sought to improve the nit...

Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.
(a) Recommend two microbes that can enrich the soil with Nitrogen.
(b)Why do leguminous crops not require such enrichment of the soil?

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(a) Clostridium and Azotobacter.
(b) Because lenuminous crop provide habitat for `N_2` - fixing microbers (e.g. Rhizobium) in their root nodules and have leghaemoglobin pigment to provide anaerobic condition for activation of such bacteria.
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