What is the use of biochar in farming?
Biochar can be used as a part of the growing medium in vertical farming.
When biochar is a part of the growing medium, it promotes the growth of nitrogen-fixing microorganisms.
When biochar is part of the growing medium, it enables the growing medium to retain water for longer time.
Which of the statements given above is/are correct?
a. 1 and 2 only
b. 2 only
c. 1 and 3 only
d. 1, 2 and 3