La sorción del fósforo en presencia de carbonato, bicarbonato y cloruro añadidos a suelos canarios

Abstract

Phosphorus sorption in the presence of carbonate or bicarbonate or choride was studied in some soils of Tenerife. The carbonate, bicarbonate and chloride anions were previously added to the soils at the 250$500 and 1000 ppm levels, leaving them to react during 15 days at field capacity. After this time, solutions of phosphorus ranging from o to 1000 or 2000 ppm P as calcium disphosphate were added to the soil samples and shaken for 24 hours. Afeter filtering the soil suspensions, pH and phosphorus in the extract were measured. The P sorption curves differ widely as well as K1 and K2 values and percentage of efficiency depending upon the soil. So the carbonate reduces the phosphoros retention 15 to 37%, 5 to 15%, 42 to 50% and 42 to 45%in the andosol, alfisol, brown soils respectively. Bicarbonate it does from 30 to 42%, 12 to 20%, 25 to 35% and 31 to 33% and chloride only influences on the P sorption of Brown soil (40 to 57%) decreased.