Methane gas producing field is

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Q: 68 (UPPSC/2014)
Methane gas producing field is—

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,39,6,5,39,1,0

keywords: 

{'methane gas': [0, 0, 0, 1], 'wheat field': [0, 0, 0, 1], 'groundnut field': [0, 0, 0, 1], 'cotton field': [0, 0, 0, 1], 'paddy field': [0, 0, 0, 1], 'field': [1, 1, 4, 8]}