In situ calibration of two FDR gauges under saline soil conditions in the hyperarid of Chile-Reference-Cited by-同舟云学术

In situ calibration of two FDR gauges under saline soil conditions in the hyperarid of Chile

Published:2021-10-01 Issue:4 Volume:38 Page:771-784
ISSN:2477-9407
Container-title:Revista de la Facultad de Agronomía, Universidad del Zulia
language:es
Short-container-title:RevFacAgron(LUZ)

Author:

Kremer Cristián¹,Candia Rodrigo¹,Homer Bannister Ian¹,Seguel Seguel Oscar¹

Affiliation:

1. Coll. Agronomic Scs, University of Chile, Santa Rosa 11315, La Pintana, Santiago, Chile. Postal code 8820808

Abstract

A calibration method was developed for two FDR sensors (GS3 and POGO) in saline soil conditions with predominantly fine textures and electrical conductivities that fluctuate between 4.4 and 16.5 dS.m-1. The methodology included the use of infiltration trenches and the recording of the variation of the water content (Ɵ) over time. The results showed that there is an overestimation of Ɵ as a function of the salt content. The standard error obtained with the manufacturer's calibration was 0.09 and 0.19 cm3.cm-3 for GS3 and POGO, respectively. After calibration, the standard error decreased to 0.04 and 0.05 cm3.cm-3, respectively. The R2 of the calibration equations for GS3 and POGO were 0.94 and 0.86 respectively, not being necessary a differentiated calibration by salinity ranges. The GS3 sensor performed better than the POGO in the salinity conditions encountered.

Publisher

Universidad del Zulia

Reference7 articles.

1. Callejas, R., C. Kremer y M. Rioseco. 2014. Experiencia práctica en la implementación de monitorización continúa. p.86-101. In: Callejas, R., Vera, J., Kremer, C (Eds.). Riego de precisión en frutales con sensores de suelo. Universidad de Chile, Facultad de Ciencias Agronómicas.

2. Fares, A., M. Safeeq and D.M. Jenkins.2009. Adjusting Temperature and Salinity Effects on Single Capacitance Sensors. Pedosphere. 19(5):588-596.

3. Ojo, E.R., P. Bullock, and J. Fitzmaurice. 2015. Field performance of five soil moisture

4. instruments in heavy clay soils. Soil Sci. Soc. Am. J. 79: 20-29.

5. Sandoval, E., J. Dörner, O. Seguel, J. Cuevas y D. Rivera. 2012. Métodos de análisis físicos de suelos. Universidad de Concepción. Publicaciones Departamento de Suelos y Recursos Naturales, Chillan, Chile. 80p.