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

Table 2

Fitted Freundlich adsorption isotherms.

CaCO3 level (%)	Phosphoric acid treated soils		DAP treated soils
	S-I	S-II	S-I	S-II
Native	𝑃=55.37𝐶^0.59	𝑃=52.87𝐶^0.63	𝑃=54.64𝐶^0.55	𝑃=57.51𝐶^0.61
10%	𝑃=192.87𝐶^0.64	𝑃=216.15𝐶^0.68	𝑃=215.29𝐶^0.61	𝑃=242.52𝐶^0.77
20%	𝑃=289.88𝐶^0.71	𝑃=267.04𝐶^0.50	𝑃=348.06𝐶^0.68	𝑃=335.82𝐶^0.71