Calibração de sonda de capacitância para a medida do conteúdo de água do solo

Abstract

There are several methods that measure the water content of the soil. The aim of sustainable water use were developed sensors that determine the water content in the soil indirectly , as the Diviner 2000® , a probe-type frequency in the time domain ( FDR ) . This study aimed to calibrate this probe capacitance to Plintosols soils common in the Fronteira Oeste of Rio Grande do Sul. The study was conducted at the experimental field of the Federal University of Pampa, Itaqui Campus, using the guidelines suggested by the manufacturer for the processing of calibration of the device. Used a factorial experiment in a completely randomized design with 3 levels of saturation in two replications with 4 layers of soil per treatment, obtained by comparing the moisture probe with standard direct method for determining the water content of the soil. However, it was not possible to reach that goal , due to the great variability of the results obtained from the readings of relative frequency . It is concluded that the calibration of the probe capacitance Diviner 2000 ® in Plintossolos be further studies investigating factors that may have influenced the dielectric constant of the soil , which consequently affected the results , preventing the calibration of this device for this soil.