Which of the following cropping methods maintains soil fertility?

1.	Which of the following cropping methods maintains soil fertility?
A.	Only (i)
B.	(i) and (ii)
C.	(ii) and (iii)
D.	(i), (ii) and (iii)
Answer» C. (ii) and (iii)

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Which of the following cropping methods maintains soil fertility?

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