Optimizing Available Phosphorus in Calcareous Soils Fertilized with Diammonium Phosphate and Phosphoric Acid Using Freundlich Adsorption Isotherm

Figure 1

Freundlich isotherms for P adsorption: (a), (b), and (c) represent native, 10%, and 20% CaCO₃, respectively.

(a)

(b)

(c)