Abstract

JARAMILLO JARAMILLO, Daniel Francisco. CRITICAL MOISTURE AND WATER REPELLENCY OF COLOMBIAN ANDISOLS COVERED  WITH Pinus patula Schltdl and Cham. Rev. Fac. Nac. Agron. Medellín [online]. 2005, vol.58, n.2, pp.2893-2906. ISSN 0304-2847.

In a stand with Andisoles planted with Pinus patula Schltdl and Cham, 4 transects were established for horizontal sampling every 5 cm in 4 depths to establish whether there was a transition zone for critical humidity in the soil that could determine the presence of water repellency in it. Determinations of WDPT were made in the field and later on samples dried at 35 °C in the laboratory.  For each condition, the gravimetric content of humidity of each sample was determined and these contents were compared to their corresponding WDPT. The soils presented high humidity contents, both in the field and when dried at 35 °C. Most of the sites were humidified in the field, but upon drying the samples at 35 °C, the majority of them from the first three pit depths became strongly water repellent. Both properties were highly variability. In some pit depths of some transects it was possible to define, precariously, critical areas of humidity for water repellency, but upon attempting to generalize this area for the entire transect profile, it was impossible to define.

Keywords : Water repellent soils; critical soil water content; transition zone; Andisols.

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