Fecha/hora: 16/06/2024 05:01:08

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	06/12/2022	
Fecha de la última actualización: 	06/12/2022	
Autoria: 	PEÑA-FLEITAS, M.T.; GRASSO, R.; GALLARDO, M.; PADILLA, F.M.; DE SOUZA, R.; RODRÍGUEZ , A.; THOMPSON, R.B.	
Afiliación: 	M. TERESA PEÑA-FLEITAS, Department of Agronomy, Univ. of Almeria, La Cañada de San Urbano, Almeria, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, La Cañada de San Urbano, 04120 Almeria, Spain; RAFAEL GILLSON GRASSO RODRIGUEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARISA GALLARDO, Department of Agronomy, Univ. of Almeria, La Cañada de San Urbano, Almeria, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, La Cañada de San Urbano, 04120 Almeria, Spain; FRANCISCO M. PADILLA, Department of Agronomy, Univ. of Almeria, La Cañada de San Urbano, Almeria, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, La Cañada de San Urbano, 04120 Almeria, Spain; ROMINA DE SOUZA, CENUR LN Departamento del Agua-Facultad de Agronomía, Universidad de la República, General Rivera 1350, Salto 50000, Uruguay; ALEJANDRA RODRÍGUEZ, University of Costa Rica, Sede Regional de Guanacaste, Guanacaste Province 50101, Costa Rica; RODNEY B. THOMPSON, Department of Agronomy, Univ. of Almeria, La Cañada de San Urbano, Almeria, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, La Cañada de San Urbano, 04120 Almeria, Spain.	
Título: 	Sample temperature affects measurement of nitrate with a rapid analysis ion selective electrode system used for N management of vegetable crops.	
Año de publicación: 	2022	
Fuente/Imprenta: 	Agronomy, 2022, Volume 12, Issue 12, 3031. OPEN ACCESS. doi: https://doi.org/10.3390/agronomy12123031	
ISSN: 	2073-4395	
DOI: 	10.3390/agronomy12123031	
Idioma: 	Inglés	
Notas: 	Article history: Received 27 October 2022; Revised 23 November 2022; Accepted 26 November 2022; Published: 30 November 2022. -- 
This article belongs to the Special Issue Growth and Nutrient Management of Vegetables (https://www.mdpi.com/journal/agronomy/special_issues/W0EN964704 ) -- 
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). --	
Contenido: 	ABSTRACT.- The practical value of portable hand-held ion selective electrode sensors (ISE) for on-farm [NO3-] measurement to assist with crop N management of vegetable crops has been demonstrated in numerous previous studies. They provide rapid, in-situ measurement of the nitrate concentration ([NO3-]) in nutrient and soil solutions, and in petiole sap. Sample temperatures, for on-farm measurements, vary appreciably. This study evaluated the effects of sample temperature on [NO3-] measurement using two different models of a commonly used, commercially available, portable ISE meter. The temperatures (5, 10, 15, 20, and 25 °C) examined were in the range likely to be encountered in practical on-farm work. Aqueous solutions of 6, 12, and 18 mmol NO3-L-1 were prepared from KNO3, Ca(NO3)2 and NaNO3. [NO3-] was measured in three replicate samples of each of the three concentrations, made from each NO3-; compound, at each temperature. The results consistently and clearly demonstrated a strong negative linear relationship between temperature-induced errors and sample temperatures. The temperature-induced error was considerable for cooled samples, being +50% at 5 °C and +31% at 10 °C. At sample temperatures of 17-20 °C, the temperature effects were minimal. Above this range, the temperature effect caused underestimation. At 25 °C, the temperature-induced error was -24%. These results show that care must be taken to ensure that sample temperatures do not erroneously affect the measurement of [NO3-] with ISE meters. Particular care needs to be taken with both refrigerated and warmer samples. 
© 2022 by the authors.	
Palabras-Clave: 	Fertigation; Horiba; ISE; LAQUAtwin; N monitoring; Nutrient solution; Petiole sap; Quick tests; Soil solution.	
Categoría del tema: 	F01 Cultivo	
URL: 	http://www.ainfo.inia.uy/digital/bitstream/item/16909/1/agronomy-12-03031-v3.pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103286-1) - PXI - AP - DD - PP/AGRONOMY/2022 -  -  - DIS