Fecha/hora: 01/06/2024 10:24:32

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	05/03/2024	
Fecha de la última actualización: 	05/03/2024	
Autoria: 	CARDOZO, G.; AYALA, W.; LEZAMA, F.; REYNO, R.; CUADRO, R.; MICHELINI, D.; JAURENA, M.; LATTANZI, F.	
Afiliación: 	GERONIMO AGUSTIN CARDOZO CABANELAS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; WALTER FELIZARDO AYALA SILVERA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; F. LEZAMA, Departamento de Sistemas Ambientales, Facultad de Agronomía, Universidad de la República, Av. Garzón 780, Montevideo, 12900, Uruguay; RAFAEL ALEJANDRO REYNO PODESTA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; WASHINGTON ROBIN CUADRO LOPEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; D. MICHELINI, Estación Experimental de Facultad de Agronomía en Salto, Facultad de Agronomía, Universidad de la República, Ruta 31 km 21.5, Salto, 50000, Uruguay; MARTIN ALEJANDRO JAURENA BARRIOS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; FERNANDO A. LATTANZI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Limited response to phosphorus fertilization in native South American grasslands across a productivity gradient despite low phosphorus concentrations in grassland herbage.	
Año de publicación: 	2024	
Fuente/Imprenta: 	Plant and Soil. 2024. https://doi.org/10.1007/s11104-024-06562-5	
ISSN: 	0032-079X (print); 1573-5036 (electronic)	
DOI: 	10.1007/s11104-024-06562-5	
Idioma: 	Inglés	
Notas: 	Article history: Received 10 October 2023; Accepted 14 February 2024; Published 26 February 2024. -- Responsible Editor: N. Jim Barrow. -- 
Correspondence: G.A. Cardozo, Instituto Nacional de Investigación Agropecuaria (INIA), Estación Experimental INIA Treinta y Tres, Ruta 8 km
281, Treinta y Tres 33000, Uruguay. e-mail: gcardozo@inia.org.uy -- Supplementary Information: The online version contains supplementary material available at https://doi.org/10.1007/s11104-024-06562-5 -- Funding: This work was supported by the National Agency for Research and Innovation (ANII-Uruguay) [grant numbers POS_NAC_2016_1_130414 y FSA_PI_2018_1_148653]. --	
Contenido: 	ABSTRACT.- Background and aims: Since 1750, the species-rich grasslands native to the Río de la Plata basin in southern South America have sustained low-input livestock production. Typically, these grasslands have low herbage phosphorus (P) concentration, and P deficiency in livestock is not rare. Worldwide, P fertilization is used to increase the productivity and nutritive value of grasslands, but it is unknown whether the Río de la Plata grasslands are limited by P availability. -- Methods: We quantified the response of aboveground net primary productivity (ANPP) to P supply in a meta-analysis of 39 trials carried out between 1968 and 2016 comprising 285 independent comparisons (cases) between unfertilized controls and P-fertilized treatments. -- Results: The ANPP of unfertilized controls ranged from 400 to 17,500 kg dry matter (DM) ha-1 y-1. In 74% of cases, P fertilization did not increase ANPP. The average response was therefore low, at 399 kg DM ha-1 (relative effect + 15%), and largely unrelated to ANPP, vegetation, or soil characteristics. Conversely, in 59% of cases herbage P concentration did increase, particularly at high fertilization rates (average 0.43 mg P g DM-1; relative effect + 36%). -- Conclusions: Despite low herbage P concentration, the current ANPP of Río de la Plata grasslands seems little limited by P supply. Luxury consumption was common in response to P fertilization. Prevailing low herbage nitrogen-to-phosphorus ratios -below 11:1 in 65% of unfertilized controls- suggest nitrogen may be limiting ANPP. In this legume-scarce ecosystem, P fertilization is unlikely to boost productivity and may pose an environmental risk. © 2024 Springer Nature	
Palabras-Clave: 	"Río de la Plata" grasslands; Forage production; Nitrogen; Stoichiometric changes.	
Categoría del tema: 	F01 Cultivo	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103844-1) - PXI - AP - DD - PLANT & SOIL/2024 -  -  - DIS