Biosolid-based biochar with soybean yield Download: Effects of Sewage Sludge and Biochar on Soybean Yield This experiment applied biosolid-based biochar to soybean plants in Iran. The results showed that the biochar created healthier soil, taller plants, and more pods. This is important because it establishes biochar as a cheaper and more natural alternative to synthetic fertilizers Pyrolysis of biosolids has several positive aspects, including the reduction of waste material that has a potential negative impact on the environment and biochar creates a healthy soil conditioner for your planting.