Avaliação da evaporação da água no solo sob diferentes condições de sombreamento

Abstract

The loss of water by evaporation in hydrographic basins in semi-arid regions is always important and needs to be quantified. Therefore, it is necessary to develop new low-cost and easy to handle technologies to monitor this phenomenon. The use of weighing microlysimeters is one of the technologies that has been used to monitor the loss of water in the soil. In this way, the objective is to evaluate water depletion in a typical luvisolic soil in the semiarid region using micro-lysimeters (ML). For analysis of water depletion in the soil, two undisturbed samples of typical luvisol soil from the Aiuaba Experimental Basin were used under weighing platforms connected to data logger systems. Two micro-lysimeters with 200 mm in diameter and 400 mm in length were used. The samples were saturated, subjected to drying in a shaded condition, in a greenhouse, and in full sun. Evaporation data on rainy days should be disregarded, since the volume of rain provided by the ML on these days is not completely evaporated on the same day, it continues to be lost on the following days, and this is a factor not considered by the daily evaporation equation. The loss of water due to drainage in the ML has not been quantified. The rate of water depletion in typical luvisolic soil does not show different behavior when subjected to full sun and shading.