Abstract
The effects of lime (Ca(OH)2) and disodium orthophosphate (Na2P04H) added separately to selected Alfisols of the Acentejo Area (Tenerife, Canary Islands) have been studied. These soils have excessh acidity and a very high amount of exchangeable aluminium. Ca(OH)2 significantly (P = 0.01) increased soil pH (at 50% acid neutralization) and available P (at 100-200% acid neutralization), and decreased exchangeable Al (at 12.5% acid neutralization) while the addition of Na2P04H did not significant affect the available P, exchangeable Al, or the pH of the soil. It is recommended that Alfisols should be treated with lime to neutralize 100-200% of the acid using wetting and drying cycles during equilibration before adding P.
