Determinação da tensão de água em solo agrícola com um sensor de dissipação de calor.

Abstract

Temperature average values registered with the sensors were similar to the ones obtained with a reference thermometer with 0,1C of accuracy. When saturated sensors were installed at 5 cm of depth inside an air dry silty clay loam, sensor response time regarding to Delta T values was a little higher than 24 hours. Observed Delta T values, under lab and field conditions had increased variability on the dry soil region in comparison with the wet soil region. Under field conditions, for six irrigation treatments with Arracacha crop (Arracacia xanthorrhiza), there was no statistical difference among Delta T averages obtained, at 10 cm depth, with the heat dissipation sensor and the soil water tension averages from tensiometer transformed to Delta T.