Development and evaluation of TDR probe for water rational management on substrates used in forest seedlings production

Marcelo Leite Conde Elaiuy, Lucas Masayuki Sato, Antonio Claudio Tesla Varallo, Claudinei Fonseca Souza

Abstract


Time Domain Reflectometry (TDR) is a reliable technique to estimate in situ moisture content in different types of materials using probes. The forest seedlings production implies in a comprehensive and empirical process of water management applied to the substrate used for cultivation in dibble-tube. This type of cultivation requires analysis of the physical characteristics of water and nutrients retention of the substrate. The main goal of this research was to develop and evaluate a TDR coaxial probe for rational management of water in the forest seedlings production. Initially, a physical validation of the probe was performed considering the following parameters: reflection coefficient, characteristic impedance and spatial sensitivity. Also, the performance of the probe was evaluated to estimate water content in laboratory conditions and we obtained a calibration curve for each type of porous material used. The results demonstrated the viability of TDR probes to estimate water content in soil and substrates.

Keywords


TDR; irrigation; water management



Revista Ambiente & Água. ISSN:1980-993X  DOI:10.4136/1980-993X

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