Soil fertility can be increased by ..........

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(A) Soil fertility is primarily enhanced by the addition of nitrogenous compounds to the soil. Nitrogen-fixing bacteria,such as $Rhizobium$,$Azotobact

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Nitrogen-fixing bacteria

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(A) Soil fertility is primarily enhanced by the addition of nitrogenous compounds to the soil. Nitrogen-fixing bacteria,such as $Rhizobium$,$Azotobacter$,and $Anabaena$,convert atmospheric nitrogen into ammonia,which plants can absorb and utilize for growth. This process increases the nitrogen content of the soil,thereby improving its fertility. Denitrifying bacteria,on the other hand,convert nitrates back into atmospheric nitrogen,which reduces soil fertility. Plasmalemma and cell membrane are cellular structures and do not contribute to soil fertility.

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