Nitrogen
use efficiency for wheat in semiarid region of Buenos Aires (Argentina):
effects of the dose and timing application
PDF (in Spanish)
Martínez, J.M.; J.A. Galantini; M.R. Landriscini. 2015. Eficiencia en el uso del nitrógeno del trigo en la región semiárida de Buenos Aires (Argentina): efectos de la dosis y momento de aplicación. Agriscientia 32 (1): 15-27
In
semiarid regions optimal fertilization is difficult due to erratic rainfall.
The aim of this study was to analyze the influence of climate variability on
the response to different rates and timing of fertilization on wheat
productivity and on efficiencies in the use of nitrogen in a site of the
semiarid region of the province of Buenos Aires, Argentina. For five years,
fertilization trials were conducted in wheat combining N rates (0, 25, 50 y 100
kg ha-1) and times of fertilization: Seeding (Ns) and tillering
(Nm). Agronomic efficiency (EUF) for dry matter (MS) and grain, and apparent
recovery of nitrogen (RAN) were evaluated. Interactions between variables
(year, rates and times) and efficiencies were found. In Nm, significant
correlations of all parameters were found with October rainfall. Protein for Ns
and Nm was significantly and inversely correlated with full cycle rainfall. Significant
correlations were found in EUF of MS and grain in this order: Full cycle
rainfall> Spring rainfall> Oct rainfall> Set rainfall. Interannual
climate variability showed the greatest influence on the nitrogen use
efficiencies, regardless the application timing.
Dr. Juan
Manuel Martínez, CERZOS (CONICET-UNS) y Departamento de Agronomía UNS, jmmartinez@criba.edu.ar
Dr. Juan
Alberto Galantini, Comisión de Investigaciones Científicas (CIC, BA),
CERZOS-(CONICET-UNS), Dpto. Agronomía (UNS). Bahía Blanca, Argentina. jgalanti@criba.edu.ar
M.Sc. María
Rosa Landriscini, CERZOS (CONICET-UNS), Dpto. Agronomía Universidad
Nacional del Sur. mlandris@criba.edu.ar
