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Question

Which of the following increases the nitrogenous content in soil?


A
Bacterial culture
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B
Blue-green algae
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C
Leguminous crops
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D
Cereal crops
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Solution

The correct options are
A Bacterial culture
B Blue-green algae
C Leguminous crops
Nutrients present in the soil are consumed by plants and are replenished or returned to the soil in many different ways.
When cereals are cultivated more nutrients are utilised, whereas leguminous crops when grown replenishes the nitrogen content in the soil with the help of microorganisms present in their root nodules.
Bacterial cultures are also available, which when mixed with the seeds aids in producing more nodules in their roots and helps in more nitrogen fixation.
There are various kinds of blue-green algae that add nitrogen to the soil.

Biology

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