CORNELL UNIVERSITY
Liming of highly weathered soils of the humid tropics
THE VALIDITY OF THE CURRENT PRACTICE OF USING KC1-EXTRACTABLE ALUMINUM FOR EVALUATING THE LIME REQUIREMENT OF ACID TROPICAL SOILS WAS EXAMINED USING AP AND B2 HORIZONS OF HIGHLY WEATHERED SOILS FROM SIX DIFFERENT LOCATIONS IN BRAZIL, COLOMBIA, AND PUERTO RICO.
Amedee, Gaston; Peech, Michael · 1970
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Abstract
THE AMOUNT OF AL (III) REMOVED EVEN UPON EXHAUSTIVE EXTRACTION BY 1 N KC1 GREATLY UNDERESTIMATED THE AMOUNT OF CACO3 THAT WAS FOUND TO REACT WITH THE SOILS UPON EQUILIBRATION OF THE SOILS WITH AN EXCESS OF CACO3 AT THE PARTIAL PRESSURE OF CO2 OF THE AIR. THE EXCHANGE ACIDITY AS DETERMINED BY THE BACL2-TRIETHANOLAMINE METHOD, HOWEVER, WAS FOUND TO AGREE CLOSELY WITH THE MAXIMUM AMOUNT OF CACO3 DECOMPOSED BY THE SOILS, ESPECIALLY IN THOSE THAT WERE KNOWN TO CONTAIN ALUMINOUS CHLORITE. CONTRARY TO EXPECTATION, THE CUMULATIVE AMOUNTS OF CA2+ REMOVED, UPON SUCCESSIVE EXTRACTIONS WITH WATER, FROM THE HIGHLY WEATHERED SOILS OF THE HUMID TROPICS WERE FOUND TO BE SMALLER THAN THAT REMOVED FROM A NEW YORK SOIL. THERE WAS NO INDICATION OF FIXATION OF CA2+ INTO NONEXCHANGEABLE FORMS.
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