A) Soil fertility
B) Community area
C) Organic content of soil
D) Nitrogenous content in the soil
Correct Answer: A
Solution :[a] If the same crop is repeated in the field year after year, a specific mineral deficiency may arise in the soil. To maintain .the nitrogen economy (soil fertility) of soil, a crop is alternated by a leguminous crop. It is called crop rotation.
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