2020 Environment - Sustainable agriculture, Biochar

What is the use of biochar in farming? 1. Biochar can be used as a part of the growing medium in vertical farming. 2. When biochar is a part of the growing medium, it promotes the growth of nitrogen-fixing microorganisms. 3. When biochar is a 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?

• 1 and 2 only
• 2 only
• 1 and 3 only
• 1, 2 and 3