Sorption of Phosphate on Douglas Fir Biochar Treated with Magnesium Chloride and Potassium Hydroxide for Soil Amendments

With increasing climate variability, a sustainable crop production approach remains an indispensable concern across the globe. In this study, P retention/availability of MgCl2.6H2O/KOH modified Douglas fir biochar was assessed. The MgCl2·6H2O/KOH treated prepared by sequentially treating with magnesium chloride and potassium hydroxide solutions. biochar’s surface area, pore volume, morphology, elemental compositions were determined using BET, SEM, SEM/EDS, powder X-ray analyzes. Both area volume reduced more than 97% following modification. Similarly, morphology changed after maximum adsorbed corresponding to Langmuir–Freundlich model 41.18 mg g−1. sorption on soil mixture pH dependent. More studies are required establish field applicability P-laden MgCl2 ·6H2O/KOH-modified as additive.