मृदा वायु में नत्रजन गैस क� – McqOptions

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1.	मृदा वायु में नत्रजन गैस की प्रतिशत मात्रा लगभग होती है -
A.	79%
B.	74%
C.	78%
D.	82%
Answer» D. 82%

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