Construction and calibration of Time Domain Reflectometry probes for assessing soil humidity in distropheric red latosol
DOI:
https://doi.org/10.31686/ijier.vol8.iss12.2812Keywords:
Irrigation management, capacitive sensors, water use efficiency, time domain reflectometry, moisture profilesAbstract
Among the indirect methods of assessing soil moisture, Time Domain Reflectometry (TDR) stands out, which uses the soil dielectric constant to provide volumetric moisture efficiently, quickly and non-destructively. Despite a practical and precise method, TDR has a high cost due to the probes and its Data Logger. In view of this, the present work aims to build and calibrate TDR probes to assess moisture in a Dystrophic Red Latosol. The present work was carried out in the experimental area of the hydraulics laboratory of the Federal University of Grande Dourados (UFGD), located in Dourados-MS, at latitude 22⁰ 12 'south, longitude 54⁰ 59' west and altitude of 434 meters. Each probe built consisted of 3 stainless steel rods (Ø = 3 mm; L = 230 mm) RG 98 cable with 90% mesh and 50 ohm impedance, 4.7 pF ceramic capacitor and BNC connector. The construction procedures followed the following steps: 1- Making the cable, 2- Preparing the rods, 3- Welding the rods to the wires, 4 -Operating test and 5 - finishing phase. After construction, they were calibrated with the characteristic soil of the Region, proceeding with the Probe Reading in two depths (10 and 30 cm) and simultaneous collection of deformed soil samples to determine the moisture based on mass in Laboratory. Subsequently, calibrations with cubic polynomial adjustment were performed. The results showed adjustments with high determination coefficients, and the probes developed showed satisfactory performances.
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Copyright (c) 2020 Abinel Bianchessi Dagher, Arthur Carniato Sanches, Fernanda Lamede Ferreira de Jesus, Rodrigo Couto Santos, Fagner Lopes Theodoro, Adriano Bicioni Pacheco, Cristiane Fernandes Lisboa, Timóteo Herculino da Silva Barros, Débora Pantojo de Souza, João Pedro Rodrigues da Silva, Bruno Machado Antunes
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Accepted 2020-11-27
Published 2020-12-01
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