Construção de uma mesa de tensão utilizando placas porosas para determinação da retenção da água no solo

Abstract

In order to determine the water's potential in the soil, the tension table was developed taking into account principles of practicality and simplicity, so that it could be easily reproduced. For this purpose, porous plates from filter candles, glass aquariums, acrylic support for the porous plates, transparent silicone hoses responsible for maintaining the water column and a metallic support for the glass aquariums and the MDF board were used. the porous plates were suspended. Undisturbed samples of an oxisol, a spossossol neossol were used, and each sample was subjected to tension of 1, 3, 6, 10 and 15 kPa, with 4 replicates for each soil sample used. The samples were saturated and only then placed under the tension table. The time required for the collected samples to reach equilibrium with the table varies according to the type of soil under analysis, and in the present experiment, both the oxisol and the neossol and the spodosol required less than 24 hours to reach this condition . Thus, upon reaching equilibrium with the tension table, the samples were weighed individually, and subsequently the moisture determination was carried out for each soil, verifying that the three types of soils behave similarly when subjected to the applied stresses .