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Abstract
In order to assure an adequate soil for agriculture, it is very important to measure the soil pH and the soil electrical conductivity (EC), because these variables can be used to predict the availability of nutrients for plants in the soil. Therefore, in this study pH and EC were studied for a soil located in Santa Elena, a rural town close to Medellin, Colombia. Soil pH was measured in the laboratory using extraction with water and solutions of CaCl2, and it was also measured in the field. Soil EC was measured in the laboratory using extraction with water. The data were used to plot Variability maps for pH and EC, and Deming Linear regression was used to find the correlations among the variables. It was found that Soil pH from water extraction had a high correlation with soil EC
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