Fecha/hora: 07/06/2024 17:37:52

Biblioteca(s): 	INIA La Estanzuela.	
Fecha corriente: 	21/02/2014	
Fecha de la última actualización: 	30/10/2019	
Autoria: 	MORON, A.; GARCIA, A.; SAWCHIK, J.; COZZOLINO, D.	
Afiliación: 	DAVID ALEJANDRO MORON YACOEL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ADRIANA GARCIA LAMOTHE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; JORGE SAWCHIK PINTOS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DANIEL COZZOLINO GÓMEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Preliminary study on the use of near-infrared reflectance spectroscopy to assess nitrogen content of undried wheat plants.	
Año de publicación: 	2007	
Fuente/Imprenta: 	Journal of the Science of Food and Agriculture, 15 January 2007, Volume 87, Issue 1, Pages 147-152.	
DOI: 	10.1002/jsfa.2691	
Idioma: 	Inglés	
Notas: 	Article history:Received 11 August 2005/ Revised version received 16 January 2006/ Accepted 16 August 2006.	
Contenido: 	Abstract: Near-infrared reflectance (NIR) spectroscopy combined with chemometrics was used to assess nitrogen (N) and dry matter content (DM) and chlorophyll in whole-wheat plant (Triticum aestivum L). Whole-wheat plant samples (n = 245) were analysed by reference method and by visible and NIR spectroscopy, in fresh (n = 182) and dry (n = 63) presentations, respectively. Calibration equations were developed using partial least squares (PLS) and validated using full cross-validation (leave-one-out method). Coefficient of determination in calibration (R2CAL) and the standard error of cross-validation (SECV) for N content in fresh sample presentation, after second derivative, were 0.89 (SECV: 0.64%), 0.86 (SECV: 0.66%) and 0.82 (SECV: 0.74%) using the visible + NIR, NIR and
visible wavelength regions, respectively. Dry sample presentation gave better R2 CAL and SECV for N compared with fresh presentation (R2 CAL > 0.90, SECV <0.20%) using visible + NIR. The results demonstrated that NIR is a suitable method to assess N concentration in wheat plant using fresh samples (unground and undried).	
Palabras-Clave: 	DRY MATTER; FORRAJE NO SECO; MATERIA SECA; NEAR-INFRARED SPECTROSCOPY; NITROGEN; PARTIAL LEAST SQUARES; UNDRIED FORAGE; WHEAT.	
Thesagro: 	NIRS; TRIGO.	
Categoría del tema: 	F01 Cultivo	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (49576-1) - INI - AP - PP - PP/J. Sci Food Agri/2007 -  -  - DIS