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Spatial correlation between the chlorophyll index and foliar npk levels in coffee crop

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dc.contributor.author Zanella, Marco Antonio
dc.contributor.author Rodrigues Junior, Francelino Augusto
dc.contributor.author Sousa, Emanoel Di Tarso dos Santos
dc.contributor.author Martins, Rodrigo Nogueira
dc.contributor.author Calijuri, Maria Lúcia
dc.date.accessioned 2021-08-30T10:10:27Z
dc.date.available 2021-08-30T10:10:27Z
dc.date.issued 2020
dc.identifier.citation ZANELLA, M. A. et al. Spatial correlation between the chlorophyll index and foliar npk levels in coffee crop. Coffee Science, Lavras, v. 15, p. 1-8, 2020. pt_BR
dc.identifier.issn 1984-3909
dc.identifier.uri https://doi.org/10.25186/.v15i.1765 pt_BR
dc.identifier.uri http://www.sbicafe.ufv.br/handle/123456789/12769
dc.description.abstract Detection of spatial variability of data that can improve crop management is a key factor for precision agriculture. In agriculture, there is a need for tools to assist farmers in decision-making about proper nutrient management, aiming to achieve their full productive potential. Based on that, this study aimed to (1) determine the spatial correlations between the chlorophyll index (CI) and the foliar levels of nitrogen, phosphorus and potassium (NPK) in the coffee crop using geostatistical tools; and (2) to evaluate the potential use of this index as a tool for site-specific nutrient management in an irrigated coffee field. For that, a study was carried out in a 2.1 ha area under arabica coffee cultivation in Paula Cândido, Minas Gerais State, Brazil. Samplings of the CI were performed in 1141 plants using a portable chlorophyll meter (SPAD-502). Regarding the NPK analysis, leaf samples from one of each 10 plants used to measure the CI were taken for chemical analysis (114 plants). Then, the data were submitted to descriptive and geostatistical analysis. For the spatial correlation analysis, the Moran Bivariate Global (I) and the Local index (Ixy) were used. The results showed a moderate correlation between the CI and N (0.500), showing the potential of the chlorophyll meter as a tool for site-specific nitrogen management in the coffee crop. Differently, the CI is not recommended for P and K management since they were not well correlated. Lastly, as a tool that performs indirect measurements, the results from the chlorophyll meter should be validated by field measurements to local calibrations. pt_BR
dc.format pdf pt_BR
dc.language.iso en pt_BR
dc.publisher Editora UFLA pt_BR
dc.relation.ispartofseries Coffee Science:v.15;
dc.rights Open Access pt_BR
dc.subject Optical sensor pt_BR
dc.subject Precision agriculture pt_BR
dc.subject Coffea arabica L. pt_BR
dc.subject Geostatistics pt_BR
dc.subject Mapping pt_BR
dc.subject.classification Cafeicultura::Solos e nutrição do cafeeiro pt_BR
dc.title Spatial correlation between the chlorophyll index and foliar npk levels in coffee crop pt_BR
dc.type Artigo pt_BR

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