Resumo

CAMACHO-TAMAYO, Jesús H  e  LUENGAS-GOMEZ, Carlos. Multivariate analysis of chemical properties in Oxisols with different levels of intervention agricultural. Acta Agron. [online]. 2010, vol.59, n.3, pp.273-284. ISSN 0120-2812.

Human intervention in agricultural production affects directly soil quality by promoting changes in physical and chemical properties through the use of fertilizers, correctives and tillage practices (Brachiria and corn- soybean). The aim of this study was to evaluate changes in the chemical properties of two Oxisols (Typic Hapludox y Typic Haplustox) with different intervention levels, in the municipality of Puerto Lopez (Meta-Colombia). Samples were taken at 42 points, spaced 25 m perpendicularly between 0-0, 10 my 0.10 and 0.20 m of deep, for a total of 168 samples in both fields. The data were analyzed by analysis of variance and multivariate analysis techniques, including principal component and cluster analysis. The properties studied were organic carbon, pH, exchangeable acidity, exchangeable aluminum, P, Ca, Mg, P, Na, effective cationic exchange capacity, sum of bases and base saturation. The agricultural intervention was reflected mainly in the topsoil, where the highest values of CO, Ca, Mg, K, P, SB, and ICC were found, probably due to the effect of crop residues, fertilizing and amendment applications.

Palavras-chave : Soil management; native savanna; rotational cropping; organic carbon; soil fertility; Eastern Plain; Colombia.

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