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Abstract:

Maize crop production depends on nitrogen (N) availability, N uptake by the crop and the efficiency with which absorbed N is used to produce biomass (NUEBIOM) or grain yield (NUEGRAIN). This framework assumes unique efficiency values for the whole stand, with no distinction among plants in spite of the inherent inter-plant variability of plant growth, especially under crowding stress. In this work we assessed the degree of contribution of different early-established groups of plants to crop responses to N fertilization of two maize hybrids (H) with different tolerance to crowding stress (high for AX820 and low for AX877) cultivated at two stand densities (9 and 12 pl m−2). Groups corresponded to the lower, mid and upper terciles (Ts) of the crop, representing dominated, intermediate and dominant plants, respectively. In most cases, lower and mid Ts had a greater participation in crop biomass and grain yield responses to N fertilization. The response of NUEBIOM and NUEGRAIN to N fertilization was higher for the lower and mid Ts than for the upper T. For each N level, crop NUEGRAIN was negatively related to inter-plant variability in plant NUEGRAIN. When no N was added, the reduction in crop NUEGRAIN of both hybrids was mainly caused by the increased inter-plant variability in plant N uptake (i.e. resource capture). Additionally, the crowding-intolerant AX877 under the most stressful condition (12 pl m−2 and no added N) had a reduced crop NUEGRAIN due to the enhanced plant-to-plant variability in grain yield (i.e. resource use). Consequently, the early-established plant-to-plant variability pattern conditioned crop NUEGRAIN; the predominant path was hybrid dependent. © 2017 Elsevier B.V.

Registro:

Documento: Artículo
Título:Contribution of the early-established plant hierarchies to maize crop responses to N fertilization
Autor:Rossini, M.A.; Otegui, M.E.; Martínez, E.L.; Maddonni, G.A.
Filiación:Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CIT-NOBA; UNNOBA-CONICET), Argentina
Escuela de Ciencias Agrarias, Naturales y Ambientales, Universidad Nacional del Noroeste de la Provincia de Buenos Aires (ECANA-UNNOBA), Argentina
Departamento de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) en INTA, Centro Regional Buenos Aires Norte, Estación Experimental Agropecuaria Pergamino, Argentina
Production Research, Asociación de Cooperativas Argentinas C.L., Argentina
Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA-CONICET), Argentina
Palabras clave:Fertilization; Inter-plant variability; Nitrogen; NUE; Zea mays; biomass; crop production; crop yield; environmental stress; fertilizer application; interspecific variation; maize; nitrogen; nutrient uptake; nutrient use efficiency; yield response; Zea mays
Año:2018
Volumen:216
Página de inicio:141
Página de fin:149
DOI: http://dx.doi.org/10.1016/j.fcr.2017.11.015
Título revista:Field Crops Research
Título revista abreviado:Field Crops Res.
ISSN:03784290
CODEN:FCRED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03784290_v216_n_p141_Rossini

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Citas:

---------- APA ----------
Rossini, M.A., Otegui, M.E., Martínez, E.L. & Maddonni, G.A. (2018) . Contribution of the early-established plant hierarchies to maize crop responses to N fertilization. Field Crops Research, 216, 141-149.
http://dx.doi.org/10.1016/j.fcr.2017.11.015
---------- CHICAGO ----------
Rossini, M.A., Otegui, M.E., Martínez, E.L., Maddonni, G.A. "Contribution of the early-established plant hierarchies to maize crop responses to N fertilization" . Field Crops Research 216 (2018) : 141-149.
http://dx.doi.org/10.1016/j.fcr.2017.11.015
---------- MLA ----------
Rossini, M.A., Otegui, M.E., Martínez, E.L., Maddonni, G.A. "Contribution of the early-established plant hierarchies to maize crop responses to N fertilization" . Field Crops Research, vol. 216, 2018, pp. 141-149.
http://dx.doi.org/10.1016/j.fcr.2017.11.015
---------- VANCOUVER ----------
Rossini, M.A., Otegui, M.E., Martínez, E.L., Maddonni, G.A. Contribution of the early-established plant hierarchies to maize crop responses to N fertilization. Field Crops Res. 2018;216:141-149.
http://dx.doi.org/10.1016/j.fcr.2017.11.015