Resumo

CORTES-D., Diego L.; PEREZ-B., Jhon H.  e  CAMACHO-TAMAYO, Jesús H.. SPATIAL RELATION BETWEEN ELECTRICAL CONDUCTIVITY AND SOME CHEMICAL SOIL PROPIERTIES. rev.udcaactual.divulg.cient. [online]. 2013, vol.16, n.2, pp.401-408. ISSN 0123-4226.

Knowledge of agricultural soils results in the predominant factor for an optimal development of agronomic activities. The objective of this work was to determine the relationship between electrical soil conductivity and some chemical properties in an Andisol. An area of 83 hectares was sampled by a rigid regular georeferenced grid of 80x80m in order to evaluate the spatial variability of the properties. The properties measured were: pH, electrical conductivity (EC), moisture content, Na, Mg and Ca. The pH showed a low variability with a coefficient of variation (CV) of 6,95%; the moisture content, Na and Mg presented a medium variability evidencing, respectively, a CV of 26,33%, 40.14% and 57.53%. A high variability corresponded to the EC and Ca, showing CVs of 69.86% and 74.36%, respectively. With this information contour maps were produced for each variable, finding a remarkable spatial relationship between EC and soil cations. The most influential one and correlated cation with EC was Na with a significance level of 99%; therefore a linear model between conductivity and sodium was developed, obtaining a coefficient of determination of 0.79. The Pearson correlation between electrical conductivity and the contents of Ca and Mg was low and not significant, situation that allowed to infer that these elements do not affect the EC. Therefore, the model established between Na and EC may even be adapted when amendments are used in this soil.

Palavras-chave : Semivariogram; spatial distribution; electrical conductivity; kriging.

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