Modern agriculture faces growing challenges from soil degradation and declining fertilizer efficiency, which often leads to severe environmental pollution when unabsorbed nutrients wash away into nearby waterways. Combining biochar with mineral nutrients creates stable fertilizers that release nutrients slowly and improve soil structure. However, traditional solid biochar amendments require massive application rates that create high shipping and handling costs for large-scale farming. Micronizing biochar into ultra-fine particles smaller than 50 micrometers allows it to be processed into liquid formulations. These liquid suspensions can be sprayed directly onto crops at much lower application rates, delivering nutrients straight to the root zone and improving overall plant absorption.

The field trial tested four distinct liquid biochar formulations applied both with and without additional inorganic chemical fertilizers. These formulations included two non-enriched wood biochars liquefied using different methods, a phosphorus-enriched biochar made from wheat straw and poultry litter, and a nitrogen-enriched biochar formula. The nitrogen-enriched liquid biochar complex produced the most dramatic results, delivering a total pasture yield of 42.20 metric tons per hectare. This performance more than doubled the yields achieved by the non-enriched biochars, which produced between 19.41 and 21.90 metric tons per hectare, as well as the standard fertilized control plots that yielded 18.75 metric tons per hectare.

Nutrient tracking revealed that the nitrogen-enriched liquid biochar complex was the only treatment to generate positive net balances for both nitrogen and phosphorus. This positive balance proves that plants absorbed their nutrients directly from the applied liquid fertilizer rather than stripping essential mineral reserves from the existing soil. Furthermore, pastures treated with the nitrogen-rich formulation produced higher foliar nitrogen concentrations, resulting in richer crude protein levels that improve livestock fodder quality. In contrast, the non-enriched and phosphorus-enriched liquid biochars required supplementary chemical fertilizing to achieve significant yield gains. Additional fertilization helped overcome strong local soil limitations caused by high background iron and aluminum levels that normally lock up available phosphorus.

Genetic sequencing of soil samples indicated that short-term liquid biochar applications did not alter the overall composition, abundance, or diversity of local soil bacteria and fungi. Financial evaluations further confirmed that all tested liquid biochar formulations generated a positive economic return. Benefit-cost ratios across the treatments ranged from 1.94 to 2.54, demonstrating that the financial gains from increased pasture production comfortably outweighed product, shipping, and application expenses. Because the nitrogen-enriched liquid biochar complex doubled crop yields without requiring extra chemical fertilizers or harming soil microbes, it offers a highly effective and profitable solution for broadacre sustainable agriculture.

Source: Omidvar, N., Joseph, S., Dissanayake, L., Farrar, M. B., Reverchon, F., Burnett, R., Trubenbacher, K., Omidvar, N., Xu, Z., Zhang, M., Liu, H., Elliott, B., & Hosseini Bai, S. (2026). Distinct forms of liquid biochar mineral complex fertilisers differently increase crop yield, nutrient balance and economic return. Biochar, 8(1), 94.