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. Biochar can be used as a part of the growing medium in vertical farming — Correct. Biochar is used as a soilless substrate/amendment in container and vertical farming because it improves porosity and nutrient-holding capacity.

2. When biochar is a part of the growing medium, it promotes the growth of nitrogen-fixing microorganisms — Correct. Its porous structure provides habitat for beneficial microbes, including nitrogen-fixing bacteria, and can improve microbial activity.

3. When biochar is a part of the growing medium, it enables the growing medium to retain water for longer time — Correct. Biochar generally increases water-holding capacity and reduces leaching in the growing medium.

Therefore, all three statements are correct.