Fecha/hora: 08/06/2024 11:12:47

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	01/03/2024	
Fecha de la última actualización: 	01/03/2024	
Autoria: 	MALTESE, N.; CARCIOCHI, W.D.; CAVIGLIA, O.P.; SAINZ ROZAS, H.R.; GARCÍA, M.; LAPAZ, ADRIAN O.; CIAMPITTI, I.A.; REUSSI CALVO, N.I.	
Afiliación: 	NICOLÁS E. MALTESE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; WALTER D. CARCIOCHI, National Research Council (CONICET), Argentina; Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, Ruta 226 km 73.5, Balcarce, Buenos Aires, Argentina; OCTAVIO P. CAVIGLIA, National Research Council (CONICET), Argentina; Facultad de Ciencias Agropecuarias, Universidad Nacional de Entre Ríos, Ruta 11, km 10.5 (3101), Oro Verde, Entre Ríos, Argentina; HERNAN R. SAINZ ROZAS, National Research Council (CONICET), Argentina; Fac. Ciencias Agrarias, Univ. Nac. de Mar del Plata, Ruta 226 km 73.5, Balcarce, Buenos Aires, Argentina; Dep. Agronomía, EEA INTA Balcarce, Balcarce, Argentina; MAURICIO GARCÍA, Corteva Agriscience, Argentina; ADRIAN O. LAPAZ, National Research Council (CONICET), Argentina; IGNACIO A. CIAMPITTI, Department of Agronomy, Kansas State University, 2004 Throckmorton Plant Science Center, Manhattan, KS, United States; NAHUEL I. REUSSI CALVO, National Research Council (CONICET), Argentina; Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, Ruta 226 km 73.5, Balcarce, Buenos Aires, Argentina.	
Título: 	Assessing the effect of split and additional late N fertilisation on N economy of maize.	
Año de publicación: 	2024	
Fuente/Imprenta: 	Field Crops Research. 2024, Volume 308, Article 109279. https://doi.org/10.1016/j.fcr.2024.109279	
ISSN: 	0378-4290	
DOI: 	10.1016/j.fcr.2024.109279	
Idioma: 	Inglés	
Notas: 	Article history: Received 23 November 2023; Received in revised form 22 January 2024; Accepted 25 January 2024; Available online 6 February 2024. --   Correspondence: Maltese, N.E.; Instituto Nacional de Investigación Agropecuaria (INIA), Estación Experimental "Dr. Alberto Boerger", Ruta 50, km 11, Colonia, Uruguay; email:nmaltese@inia.org.uy -- Funding: Partial funding for this work was provided by ANPCyT (PICT-2020-SERIEA-01122 ; PICT-2020-SERIEA-00605 ) and UNER (PID 2227). Contribution no. 24-183-J from the Kansas Agricultural Experiment Station. --	
Contenido: 	ABSTRACT.- Context: In the temperate-humid region of Argentina, nitrogen (N) fertilisers in maize (Zea mays L.) are mainly applied around sowing, whereas N-splitting is rare and occurs during early vegetative stages. Splitting and late N fertilisation, even up to silking (R1), effects on yield have been recently studied. However, to the extent of our knowledge, these studies have mainly focused on the effect of these strategies on maize yield, but less on the crop N economy. Objective: The aims were to study the mechanisms explaining the effect of i) splitting N and ii) additional N application at R1 on yield, post-flowering N uptake, kernel weight, N uptake efficiency, and the relationship of these variables with the N nutrition index (NNI). Methods: Seven experiments were carried out throughout the humid temperate region of Argentina, evaluating seven treatments: a control without N fertilisation, N rate entirely applied at sowing or split between sowing, eight leaf (V8), and R1, an additional N rate at R1, and an N sufficiency treatment. Results: The scenario with split N application had no adverse effect on either yield or N uptake at maturity (P > 0.05), with less pre-flowering N uptake compensated with more post-flowering N uptake in late N applications. In turn, increases in both yield and kernel weight were related to increases in post-flowering N uptake. Positive yield responses to N-splitting (plateauing at 450 kg ha-1) were obtained with yield responses to N greater than 3107 kg ha-1. Likewise, yield responses to additional N at R1 (plateauing at 1107 kg ha-1) were evident with yield responses greater than 2943 kg ha-1. The NNI at R1 accounted for variations in post-flowering N uptake and yield, as well as yield responses to additional N at R1 and their impact on kernel weight. Conclusion: Results show that N-splitting and late N fertilisation are promising strategies that, combined with crop N status monitoring, could lead to improvements in both maize yield and N economy. © 2024 Elsevier B.V.	
Palabras-Clave: 	Crop nutrition; N use efficiency; Nitrogen nutrition index; Timing of fertilisation.	
Categoría del tema: 	--	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (103831-1) - PXI - AP - DD - Field Crops Research/2024 -  -  - DIS