the nitrogen deficiency of soil can be made up by using the principle of-

a)multiple cropping

b)crop rotation

plz answer... exam tomm

The correct option is b.
In Crop rotation we plant different crops in the same piece of land in different seasons.
The primary objective of crop rotation is to maintain soil balance. Some crops require extra nitrogen for their growth like tomatoes and  corn. If such crops are planted year after year the soil will become nitrogen deficient. So these type of crops are rotated with legumes (legumes by the help of nitrogen fixing bacteria fix atmospheric nitrogen)
Thus nitrogen deficiency of a soil can be overcome by principle of crop rotation. 

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b) crop rotation..

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