Microbes in Human WelfareEasy
Question
The common nitrogen-fixer in paddy fields is
Options
A.Rhizobium
B.Azospirillum
C.Oscillatoria
D.Frankia
Solution
Azospirillum is a nitrogen fixing bacterium in paddy fields. It is very useful soil and root bacterium. It is an associative symbiotic N2-fixing bacteria. When it is added to the soil, it multiplies in millions and can supply 20-40 Kg of nitrogen per hactare per sesson. It also produces growth promoting substance like Indole Acetic Acid (IAA), gibberellins and promotes root proliferation. These substances improve the plant growth and yield.
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