Contribution of the early-established plant hierarchies to maize crop responses to N fertilization

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...

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Detalles Bibliográficos
Publicado: 2018
Materias:
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
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03784290_v216_n_p141_Rossini
http://hdl.handle.net/20.500.12110/paper_03784290_v216_n_p141_Rossini
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03784290_v216_n_p141_Rossini
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spelling paper:paper_03784290_v216_n_p141_Rossini2023-06-08T15:39:45Z Contribution of the early-established plant hierarchies to maize crop responses to N fertilization 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 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. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03784290_v216_n_p141_Rossini http://hdl.handle.net/20.500.12110/paper_03784290_v216_n_p141_Rossini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Contribution of the early-established plant hierarchies to maize crop responses to N fertilization
topic_facet 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
description 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.
title Contribution of the early-established plant hierarchies to maize crop responses to N fertilization
title_short Contribution of the early-established plant hierarchies to maize crop responses to N fertilization
title_full Contribution of the early-established plant hierarchies to maize crop responses to N fertilization
title_fullStr Contribution of the early-established plant hierarchies to maize crop responses to N fertilization
title_full_unstemmed Contribution of the early-established plant hierarchies to maize crop responses to N fertilization
title_sort contribution of the early-established plant hierarchies to maize crop responses to n fertilization
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03784290_v216_n_p141_Rossini
http://hdl.handle.net/20.500.12110/paper_03784290_v216_n_p141_Rossini
_version_ 1768542222417920000

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