Fecha/hora: 16/06/2024 06:30:23

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	05/02/2020	
Fecha de la última actualización: 	05/02/2020	
Autoria: 	DE SOUZA, R.; GRASSO, R.; PEÑA-FLEITAS, M.T.; GALLARDO, M.; THOMPSON, R.B.; PADILLA, F.M.	
Afiliación: 	ROMINA DE SOUZA, Department of Agronomy, University of Almeria, Almería, Spain; RAFAEL GILLSON GRASSO RODRIGUEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; M. TERESA PEÑA-FLEITAS, Department of Agronomy, University of Almeria, Almería, Spain; MARISA GALLARDO, Department of Agronomy, University of Almeria, Almería, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, Almería, Spain; RODNEY B. THOMPSON, Department of Agronomy, University of Almeria, Almería, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, Almería, Spain; FRANCISCO M. PADILLA, Department of Agronomy, University of Almeria, Almería, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, Almería, Spain.	
Título: 	Effect of cultivar on chlorophyll meter and canopy reflectance measurements in cucumber.	
Año de publicación: 	2020	
Fuente/Imprenta: 	Sensors (Switzerland), 2 January 2020, Volume 20, Issue 2, Article number 509. OPEN ACCESS. Doi:  https://doi.org/10.3390/s20020509	
ISSN: 	1424-8220	
DOI: 	10.3390/s20020509	
Idioma: 	Inglés	
Notas: 	Article history: Received: 29 November 2019 / Revised: 13 January 2020 / Accepted: 14 January 2020 / Published: 16 January 2020.
This article belongs to the Special Issue Proximal Sensing for Nitrogen Management: https://www.mdpi.com/journal/sensors/special_issues/Proximal_Nitrogen
Funding information: Funding: This research was funded by Spanish Ministry of Economy and Competitiveness (Project AGL2015-67076-R). RdS was supported by a FPI grant (BES-2016-076706) and FMP by a Ramón y Cajal grant (RYC-2014-15815).
Correspongin author: Romina de Souza (rominadesouzai@gmail.com); Rafael Grasso (rgrasso@inia.org.uy); M. Teresa Peña-Fleitas (mtpena.fl@ual.es); Marisa Gallardo (mgallard@ual.es); Rodney B. Thompson (rodney@ual.es); Francisco Padilla (f.padilla@ual.es)	
Contenido: 	ABSTRACT.
Optical sensors can be used to assess crop N status to assist with N fertilizer management. Differences between cultivars may affect optical sensor measurement. Cultivar effects on measurements made with the SPAD-502 (Soil Plant Analysis Development) meter and the MC-100 (Chlorophyll Concentration Meter), and of several vegetation indices measured with the Crop Circle ACS470 canopy reflectance sensor, were assessed. A cucumber (Cucumis sativus L.) crop was grown in a greenhouse, with three cultivars. Each cultivar received three N treatments, of increasing N concentration, being deficient (N1), sufficient (N2) and excessive (N3). There were significant differences between cultivars in the measurements made with both chlorophyll meters, particularly when N supply was sufficient and excessive (N2 and N3 treatments, respectively). There were no consistent differences between cultivars in vegetation indices. Optical sensor measurements were strongly linearly related to leaf N content in each of the three cultivars. The lack of a consistent effect of cultivar on the relationship with leaf N content suggests that a unique equation to estimate leaf N content from vegetation indices can be applied to all three cultivars. Results of chlorophyll meter measurements suggest that care should be taken when using sufficiency values, determined for a particular cultivar. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.	
Palabras-Clave: 	Genotype; Greenhouse; Leaf nitrogen; Proximal optical sensors; Vegetation index.	
Categoría del tema: 	F01 Cultivo	
URL: 	https://www.mdpi.com/1424-8220/20/2/509/pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (102162-1) - PXI - AP - DD - PP/SENSORS/2020 -  -  - DIS