The Scientific World Journal / 2013 / Article / Tab 4

Research Article

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

Table 4

Quantities of P2O5 (kg ha−1) required to achieve 0.2 mg L−1 soil solution P.

CaCO3 level (%)PADAP
S-IS-IIS-IS-II

Native98 ± 6.29*78 ± 5.69113 ± 7.9499 ± 5.89
10%302 ± 8.67298 ± 12.49317 ± 14.42316 ± 9.50
20%421 ± 14.65419 ± 8.60490 ± 20.13483 ± 12.98

Means ± SE.

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