Which of the following is used as a biofertilizer for soybean crop ........

Agriculture and Rural Development (Phase-I/II) sustainable Agriculture

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Which of the following is used as a biofertilizer for soybean crop?

Nostoc

Azospirillum

Rhizobium

Azotobacter

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Explanation:

Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes (Fabaceae). To express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are gram negative, motile, non-sporulating rods.