If wheat field is inoculated with Rhizobium
Soil will become nitrogen rich
No effect on soil nitrogen
Soil will be depleted of nitrogen
Soil will become rich in calcium
Nitrogen fixation is
Azotobacter and Bacillus polymyxa are
Farmers have reported $50\%$ higher yield of rice by using biofertilizer
$VAM$ represents
Which one of the following is not used in organic farming?