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

Table 3

Buffer capacities of CaCO₃ enriched soils as determined from Freundlich adsorption isotherms.

CaCO3 level (%)	PA		DAP
	S-I	S-II	S-I	S-II
Native	33 ± 1.63*	33 ± 1.98	30 ± 1.72	35 ± 2.07
10%	128 ± 5.57	121 ± 3.40	145 ± 4.50	175 ± 8.89
20%	206 ± 11.95	211 ± 9.54	239 ± 9.01	248 ± 15.41

∗Means ± SE.