Question

Which of the following is a new bio-fertilizers?
A. Green Blue Algae
B. Nitrates
C. Compost
D. Farmyard manure

Answer 1

Hint: Biofertilizers are the microbial inoculants which contain a preparation of living or dormant cells of productive strains of nitrogen fixing, phosphate solubilizing, and cellulolytic microorganisms, etc. They keep the environment of the soil rich, produce antibiotics and biodegrade organic matter in the soil.

Complete Answer:
Looking at the above options:
Option A: Rhizobium, Azotobacter, Azospirillum and blue green algae(BGA) have been used as biofertilizers, traditionally. Rhizobiuminoculant is utilized for leguminous crops such as pulses. For crops such as wheat, maize, mustard, cotton, potato and other vegetable crops, azotobacter can be used. This option is correct.
Option B: Plants use nitrate as an important nutrient. In commerce, the most of the nitrate is utilized in inorganic fertilizers. These are not bio fertilizer. This option is incorrect.
Option C: Compost biofertilizers are those which use animal dung to enhance the soil with the help of microorganisms and nutrients. This is not a new bio fertilizer. This option is incorrect.
Option D: Farmyard manure is common in the mid hills of Nepal. It is a mixture of animal manure, urine, bedding material, fodder residues, and other components. It is an organic manure. This option is incorrect.
Hence, the correct option is, ‘A. Green Blue Algae’.

Note:
- The biofertilizers, whose input cost is low, renewable and pollution free have a significant role in enhancing nutrient supply to crops by improving their availability.
- Blue Green Algae thrive well in waterlogged conditions of rice fields and give reasonable nitrogen to plants besides improving crop output.