Fig. 1From: Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soilsN2 adsorption–desorption isotherms (a–c) and pore size distribution (d–f) of HBC, H3PO4-modified biochar (P-HBC), and H4P2O7-modified biochar (PA-HBC)Back to article page