After red gram, maize and corn are cultivated because

They increase fertility of soil

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They fix

N_{2}

in soil

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They enhance growth of plant

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They prevents disease caused by spotted bole worm

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Solution

The correct option is A They increase fertility of soil
After red gram, maize and corn are cultivated because intercropping is to produce a greater yield on a given piece of land by making use of resources or ecological processes that would otherwise not be utilized by a single crop.
So the correct option is 'They increase the fertility of soil'.

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