Abstract
Abstract A pot trial was conducted in order to relate the increase in the cation exchange capacity (CEC) of an acid soil (Quartspsament) to the CEC of several organic materials which were added to it. Peat, sugarcane bagasse and filter cake from sugar industry, worm compost, poultry and cattle manure, compost, and papermill sludge were incubated in natural and limed soil under controlled soil water content. Soil CEC was measured at soil pH after 30 and 90 days of incubation and results were strongly affected by pH of the incubated soil. About 32% of the soil CEC would be predicted by the CEC of the organic material measured at pH 7.0. This proportion increased to 78% when soil pH was included in the regression.
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