Question

The most common biofertilizer for rice crop is

• A. Azolla
• B. Trifolium
• C. Sesbania rostrata
• D. Bacillus polymyxa

Answer 1

The correct option is A Azolla

Biofertilizers are substances which are either living microorganisms or made from one which, are applied to the plant surfaces, or soil. These colonize the rhizosphere and helps to increase the availability of primary nutrients to the host plant, thereby promoting growth. The bio-fertilizers add nutrients to the soil through nitrogen fixation and increases phosphorous content by 25%. In rice fields, Azolla with its nitrogen-fixing capability is widely used as a biofertiliser. The flooded rice fields are inoculated with Azolla which helps to suppress the weeds.

So, the correct answer is option A.