What is required for nitrogen fixation by Rhizobium? [DPMT 1988; APMEE – McqOptions

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1.	What is required for nitrogen fixation by Rhizobium? [DPMT 1988; APMEE 1989]
A.	Potassium
B.	Phosphorus
C.	Nitrate
D.	Sodium
Answer» C. Nitrate

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