2.2.1 Soil Physical Analysis
In order to determine the physical attributes of the soil, undisturbed samples were taken with cylinders that were 5cm tall and 5cm in diameter. Then, the following variables were measured: a) bulk density (BD) using the cylinder method (Klute & Page, 1986); b) saturated hydraulic conductivity (Ksat) using the variable load method (Reynolds & Elrick, 2002), following the pore size distribution method (c) total porosity (TP); (d) aeration porosity (AP: pores of >15 µm radius); and (e) retention porosity (RP), using the saturation tension table method with -10 kPa a matric potential (Blake & Hartge, 1986).