We have studied the spatial variability of agricultural soils in the experimental farm at Magdalena University (Santa Marta, Colombia; 74° 07' - 74° 12' W, 11° 11' - 11° 15' N). Analyzed soil properties included: gravimetric soil moisture content, grain size analysis, bulk density, resistance to root penetration, hydraulic conductivity, organic matter content, pH, cation exchange capacity, total N and P, exchangeable cations (Ca+2, Mg+2, K+, Na+), metals (Cu, Zn, Fe , Mn) and B content. Sampling was based on a 29 x 29 m grid, resulting in 184 sampling points.
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