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Researchers have explored using biochar made from macroalgae residues to boost tomato plant growth. Biochar, a carbon-rich material, was produced from leftover macroalgae after agar extraction. These residues, typically discarded, were processed to extract remaining bioactive compounds through various methods, including thermal and biological treatments. Combining these extracts with biochar created a multifunctional product aimed at enhancing plant growth.

The study revealed that biochar alone increased tomato shoot and root biomass by 54% and 100%, respectively. When the biochar was impregnated with algae extracts, these numbers surged dramatically, with shoot biomass rising by up to 146% and root biomass by up to 450%. The most effective extracts came from acid and enzymatic pretreatments, which yielded the highest levels of proteins and phosphorus.

This innovative approach not only utilizes waste materials but also provides a significant boost to agricultural productivity. By integrating biochar and algae extracts, the study offers a sustainable solution that enhances soil nutrients and plant growth. The results suggest that using algae residues in this way could lead to more efficient and environmentally friendly agricultural practices.