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In maize (Zea mays L.) crops, nitrogen (N) status at silking (R1) has been used to predict grain yield (GY) response to N fertilization and to develop strategies to manage crop nutrition in order to match N supply with crop demand during growing season, such as late N fertilizations. Crop N status can be estimated by N nutrition index (NNI), which is based on actual and critical N concentration in crop biomass. Optical measurements of N concentration
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dc.contributor.author | Maltese, Nicolás | |
dc.contributor.author | Maddonni, Gustavo Angel | |
dc.contributor.author | Melchiori, Ricardo Jose | |
dc.contributor.author | Ferreyra, Juan Matías | |
dc.contributor.author | Caviglia, Octavio | |
dc.date.accessioned | 2020-10-20T14:19:15Z | |
dc.date.available | 2020-10-20T14:19:15Z | |
dc.date.issued | 2020 | |
dc.identifier.issn | 0378-4290 | |
dc.identifier.issn | 1872-6852 | |
dc.identifier.other | https://doi.org/10.1016/j.fcr.2020.107965 | |
dc.identifier.uri | http://hdl.handle.net/20.500.12123/8086 | |
dc.identifier.uri | https://www.sciencedirect.com/science/article/abs/pii/S0378429020312491 | |
dc.description.abstract | In maize (Zea mays L.) crops, nitrogen (N) status at silking (R1) has been used to predict grain yield (GY) response to N fertilization and to develop strategies to manage crop nutrition in order to match N supply with crop demand during growing season, such as late N fertilizations. Crop N status can be estimated by N nutrition index (NNI), which is based on actual and critical N concentration in crop biomass. Optical measurements of N concentration (e.g. SPAD readings) of the leaf blade subtending primary ear have also been used as a proxy of crop N status. Sowing date (SD) and N rates could affect soil N availability and hence crop N uptake at R1. Additionally, the effects of SD and its interaction with plant density (PD), N rates and hybrids (H) on N uptake (NuptP) and particularly on N partitioning in leaf-blades, stem + sheaths and ears could affect SPADs readings. We hypothesized that variations of GY by crop N status at R1 promoted by SD, PD and H, would be better predicted by NNI than by SPAD readings. In this study, two Hs (DK 70−10 VT3P and DK 73−10 VT3P) were cropped in two contrasting SD (early and late) in Paraná, Argentina (31°44′ S 60°32′ W) at three PD (5, 7 and 9 pl m−2) with three N rates (0, 90 and 270 kg N ha-1) in order to evaluate the effect of treatments on: i) N availability, N uptake at the plant and crop level, N partitioning in leaf-blades, stem + sheaths and ears, SPAD readings and NNI at R1, and ii) the relationships among N availability and N uptake at the plant and crop level, NNI, SPAD, and GY. N concentration of leaf-blades was negatively affected by PD, but this reduction was attenuated by N rates, especially in late SD (N x PD x SD interaction). Hence, in early SD, some data of both Hs corresponding to 270 N yielded low SPAD values for NNI greater than 0.86. Consequently, crop N status was better reflected by NNI than by SPAD readings, because NNI considers N stored in the whole plant. NNI at R1 adequately described relative GY variations promoted by SD, PD, N rates and, Hs, i.e. NNI was a more meaningful crop status index than SPAD readings. Overall, our study contributes to understanding mechanisms that regulate crop N status affected by agronomical practices and adds insights to explore in late N fertilization of maize crops. | es_AR |
dc.format | application/pdf | es_AR |
dc.language.iso | eng | es_AR |
dc.publisher | Elsevier | es_AR |
dc.rights | info:eu-repo/semantics/restrictedAccess | es_AR |
dc.source | Field Crops Research 258 : 107965 (November 2020) | es_AR |
dc.subject | Maíz | es_AR |
dc.subject | Maize | eng |
dc.subject | Nitrógeno | es_AR |
dc.subject | Nitrogen | eng |
dc.subject | Fecha de Siembra | es_AR |
dc.subject | Sowing Date | eng |
dc.subject | Espaciamiento | es_AR |
dc.subject | Spacing | eng |
dc.subject.other | Densidad de Siembra | es_AR |
dc.title | Crop nitrogen status of early- and late-sown maize at different plant densities | es_AR |
dc.type | info:ar-repo/semantics/artículo | es_AR |
dc.type | info:eu-repo/semantics/article | es_AR |
dc.type | info:eu-repo/semantics/publishedVersion | es_AR |
dc.description.origen | EEA Paraná | es_AR |
dc.description.fil | Fil: Maltese, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina. Universidad Nacional de Entre Ríos. Facultad de Ciencias Agropecuarias; Argentina | es_AR |
dc.description.fil | Fil: Maddonni, Gustavo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Cerealicultura; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Fisiología y Ecología Vinculado a la Agricultura; Argentina | es_AR |
dc.description.fil | Fil: Melchiori, Ricardo Jose. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina. | es_AR |
dc.description.fil | Fil: Ferreyra, J.M. Bayer – Crop Science. Market Development LATAM; Argentina | es_AR |
dc.description.fil | Fil: Caviglia, Octavio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Entre Ríos. Facultad de Ciencias Agropecuarias; Argentina | es_AR |
dc.subtype | cientifico |
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