Which one of the following practices is adopted for restoring the fertility of soil ?

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Q: (SSC/0)

Which one of the following practices is adopted for restoring the fertility of soil ?
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question_subject: 

Geography

question_exam: 

SSC

stats: 

0,7,5,2,1,7,2

keywords: 

{'soil': [7, 0, 4, 7], 'fallowing': [2, 0, 0, 0], 'fertility': [5, 0, 1, 4], 'levelling': [1, 0, 0, 0], 'practices': [1, 0, 1, 7], 'harrowing': [1, 0, 0, 0]}