Mostrar el registro sencillo del ítem

resumen

Resumen
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 [ver mas...]
dc.contributor.authorMaltese, Nicolás
dc.contributor.authorMaddonni, Gustavo Angel
dc.contributor.authorMelchiori, Ricardo Jose
dc.contributor.authorFerreyra, Juan Matías
dc.contributor.authorCaviglia, Octavio
dc.date.accessioned2020-10-20T14:19:15Z
dc.date.available2020-10-20T14:19:15Z
dc.date.issued2020
dc.identifier.issn0378-4290
dc.identifier.issn1872-6852
dc.identifier.otherhttps://doi.org/10.1016/j.fcr.2020.107965
dc.identifier.urihttp://hdl.handle.net/20.500.12123/8086
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S0378429020312491
dc.description.abstractIn 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.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherElsevieres_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceField Crops Research 258 : 107965 (November 2020)es_AR
dc.subjectMaízes_AR
dc.subjectMaizeeng
dc.subjectNitrógenoes_AR
dc.subjectNitrogeneng
dc.subjectFecha de Siembraes_AR
dc.subjectSowing Dateeng
dc.subjectEspaciamientoes_AR
dc.subjectSpacingeng
dc.subject.otherDensidad de Siembraes_AR
dc.titleCrop nitrogen status of early- and late-sown maize at different plant densitieses_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEEA Paranáes_AR
dc.description.filFil: 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; Argentinaes_AR
dc.description.filFil: 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; Argentinaes_AR
dc.description.filFil: Melchiori, Ricardo Jose. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina.es_AR
dc.description.filFil: Ferreyra, J.M. Bayer – Crop Science. Market Development LATAM; Argentinaes_AR
dc.description.filFil: Caviglia, Octavio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Entre Ríos. Facultad de Ciencias Agropecuarias; Argentinaes_AR
dc.subtypecientifico


Ficheros en el ítem

Thumbnail

Este ítem aparece en la(s) siguiente(s) colección(ones)

common

Mostrar el registro sencillo del ítem