Determinación de la variabilidad espacial de las características físicas del suelo en la parcela experimental Irquis

Abstract

The soil presents diverse interactions in its formation process due that intervene factors geological and pedological acquiring characteristics heterogeneity and variability physical and chemical properties. This variability can be caused due to tillage, soil management practices and it may vary at the large and small scale. In the present test, the spatial variability of the physical properties of the soil in the Irquis experimental plot was determined. An analysis of variance was performed to evaluate longitudinally and transversely effect of the experimental unit. Two Ordinary Kriging and Inverse Distance Weighted methods were to compare the prediction results of the variables studied. The validation of interpolation methods was through cross validation. The results obtained from the evaluation of longitudinal effect was found differences for bulk density and organic matter, due to the depositions of drag colluvial of talud, it was concentrating in the lower parts of the experimental unit. In the transversal effect analysis differences were found for sand, silt and clay, due to the sediments deposited by the overflows of the brook that flows parallel to the plot. It obtained low values of the statistical indicators of cross-validation by the Ordinary Kriging method. The interpolation method that presented prediction efficiency values was Ordinary Kriging for all the variables, although these values were similar. The maps generated by Inverse Distance Weighted showed isolated zones were more evident in certain variables.