Relacões fisico-hidricas em um perfil de cambissolo com cacaueiro não sombreado no Semiárido da Bahia

Abstract

The physical attributes of a soil-water influence crop production, since they are related to the aeration storage capacity and availability of water to plants. The study aimed to characterize hydro-physical profile of a Eutrophic Cambisol cultivated with cocoa unshaded and setting a model for determining the hydraulic conductivity as a function of soil moisture by the instantaneous profile method drain (PID). For completion of the work was chosen an area between two unshaded cacao orchards belonging to Chapadao Farm (12 ° 51 `46 `` S and 41 ° 08` 14 `` W, 350 m) located in Nova Redemption in semiarid Baiano. Samples were taken and undisturbed in profundity 0.10; 0.30; 0.50; 0.70; 0.90 and 1,10 m for the study of the physical attributes of soil water through the opening of a trench. For the application of PID, we selected a circular area with a diameter of 4 m. The monitoring of soil moisture was accomplished through TDR probes inserted vertically into the depths mentioned above. There were no significant differences in the physical-hydric studied. There was a good model fit cubic polynomial calibration of TDR probes in all layers of the soil profile. The proposed equation for determining the hydraulic conductivity as a function of soil moisture without considering the total potential gradient unit, was valid for the soil profile studied.