Fecha/hora: 20/05/2024 14:46:26

Biblioteca(s): 	INIA La Estanzuela.	
Fecha corriente: 	21/02/2014	
Fecha de la última actualización: 	30/09/2019	
Autoria: 	MORON, A.; COZZOLINO, D.	
Afiliación: 	DAVID ALEJANDRO MORON YACOEL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DANIEL COZZOLINO GÓMEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Determination of macro elements in alfalfa and white clover by near-infrared reflectance spectroscopy.	
Año de publicación: 	2002	
Fuente/Imprenta: 	Journal of Agricultural Science, December 2002, Volume 139, Issue 4, pages 413-423.	
DOI: 	10.1017/S0021859602002605	
Idioma: 	Inglés	
Notas: 	Article history: Revised MS received 19 August 2002.	
Contenido: 	Summary: Near-infrared reflectance spectroscopy was used to assess the mineral composition of both alfalfa (Medicago sativa L.) and white clover (Trifolium repens L.). Alfalfa (n=230) and white clover (n=97) plant samples from different locations in Uruguay representing a wide range of soil types were analysed. The samples were scanned for reflectance in a NIRSystems 6500 monochromator (NIRSystems, Silver Spring, MD, USA). Predictive equations were developed using modified partial least squares (MPLS) with cross validation to avoid overfitting. The coefficients of determination in calibration (R_{\rm cal}^{2}) and the standard errors in cross validation (SECV) were 0·93 (SECV: 1·6), 0·95 (SECV: 1·3), 0·93 (SECV: 1·9), 0·88 (SECV: 2·7), 0·82 (SECV: 0·3) and 0·75 (SECV: 4·7) for alfalfa and 0·98 (SECV: 0·8), 0·52 (SECV: 0·8), 0·97 (SECV: 2·7), 0·83 (SECV: 3·1), 0·82 (SECV: 1·9) and 0·45 (SECV: 2·6) for white clover, for N, Ca, K, P, Mg and S in g/kg on a dry weight respectively. Calcium, nitrogen and potassium were well predicted by NIRS in both alfalfa and white clover samples.	
Palabras-Clave: 	MAGNESIUM; MINERAL CONTENT.	
Thesagro: 	CALCIUM; MEDICAGO SATIVA; NIRS; POTASSIUM.	
Categoría del tema: 	F01 Cultivo	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (35490-1) - PXI - AP - DD - PP/Journal of Agricultural Science/2002 -  -  - DIS