The method of cultivation that results in the loss of fertility is: i) crop rotation ii) excessive use of fertilizers iii) shifting cultivation iv) all of these  The method of cultivation that results in the loss of fertility is: i) crop rotation ii) excessive use of fertilizers iii) shifting cultivation iv) all of these

The correct option is ii).
Excessive use of fertilisers can reduce the natural replenishing ability of soil. Their excessive use can change the chemical nature of soil and make it less fertile.

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excessive use of fertilizers 
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crop rotation
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excessive use of fertilizers
 
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excessive use of fertilizers
 
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excessive use of fertilizers
 
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Excessive use of fertilizers
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ii) Excessive use of fertilizers ...
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