Fecha/hora: 16/06/2024 09:31:28

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	26/02/2024	
Fecha de la última actualización: 	26/02/2024	
Autoria: 	JÁUREGUI, J.M.; MICHELINI, D.F.; SEVILLA, G.H.; BERHONGARAY, G.; BERONE, G.D.; BAUDRACCO, J.; CHILIBROSTE, P.; AGNUSDEI, M.G.; LATTANZI, F.	
Afiliación: 	J. M JÁUREGUI, Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Esperanza, Argentina; Livestock Division, Datamars SA, Lamone, Switzerland; D. F. MICHELINI, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Salto, Uruguay; G. H. SEVILLA, Estación Experimental Agropecuaria Concepción de Uruguay, Instituto Nacional de Tecnología Agropecuaria, Entre Ríos, Concepción del Uruguay, Argentina; G. BERHONGARAY, Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Esperanza, Argentina; ICiAgro Litoral, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina; G. D. BERONE, Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria, Buenos Aires, Balcarce, Argentina; Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina; J. BAUDRACCO, Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Esperanza, Argentina; ICiAgro Litoral, Universidad Nacional del Litoral-CONICET, Santa Fe, Argentina; PABLO CHILIBROSTE SYMONDS, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Paysandú, Uruguay; M. G. AGNUSDEI, Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria, Buenos Aires, Balcarce, Argentina; FERNANDO A. LATTANZI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Tall fescue tiller survival over summer in a subtropical environment: The role of the size and depth of root systems.	
Año de publicación: 	2024	
Fuente/Imprenta: 	Journal of Agronomy and Crop Science. 2024, Volume 210, Issue 1, article e12682. https://doi.org/10.1111/jac.12682	
ISSN: 	0931-2250	
DOI: 	10.1111/jac.12682	
Idioma: 	Inglés	
Notas: 	Article history: Received 5 May 2023; Revised 20 October 2023; Accepted 1 November 2023. -- Correspondence: J. M. Jáuregui, Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Esperanza, Argentina. Email: josemartinjauregui@gmail.com -- Funding information:
Consejo Nacional de Investigaciones Científicas y Técnicas. --	
Contenido: 	ABSTRACT.- Pasture persistence is a key determinant of the economic and environmental performance of pastoral animal production systems. Large and deep root systems that help resist summer water stress have been proposed as a relevant trait for vegetative persistence of perennial temperate forage species growing in subtropical climates or under future climatically challenging scenarios. In a previous study [Jauregui et al., 2017. Persistence of tall fescue in a subtropical environment: Tiller survival over summer in response to flowering control and nitrogen supply. Grass and Forage Science 72, 454-466] we have shown that nitrogen fertilization and grazing management aimed at 'control flowering' increased the survival of tall fescue tillers during harsh summers in Uruguay (lat. 32°S). Here we assessed: (i) to what extent tiller survival is mediated by root system size in spring and (ii) what consequences tiller survival entails for root mass, depth and morphology the following autumn. In two field experiments, significant increases in tiller survival in response to nitrogen fertilization and grazing management (+60% and +80% in 2011/12 and 2012/13, respectively) were not related to concomitant effects on the size or depth of the root system in spring (p >.10). Even when six-fold within-treatment variation in root mass was observed, within-treatment variation in summer tiller survival was little affected (<15%, p =.08). In turn, differences in tiller survival over summer affected little root system characteristics the following autumn. Therefore, we found scant support for the hypothesis that large and deep root systems contribute to survival of tall fescue tillers in this subtropical humid climate. Except for soils with less than 30 mm of plant available water holding capacity, summer water deficits did not induce severe tiller mortality in tall fescue in this climate. © 2024 Wiley-VCH GmbH. Published by John Wiley & Sons Ltd.	
Palabras-Clave: 	Forage; Grazing management; Heat stress; Nitrogen fertilisation; Partnership for the goals - Goal 17; Pasture persistence; Sustainable Development Goals (SDGs).	
Categoría del tema: 	F01 Cultivo	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103819-1) - PXI - AP - DD - Jr. Agronomy & Crop Science/2024 -  -  - DIS