Please use this identifier to cite or link to this item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1167517
Title: Estimation of nitrogen and phosphorus content in cotton leaves from medium-resolution satellite images.
Authors: BRANDÃO, Z. N.
GREGO, C. R.
GONDIM, T. M. de S.
RODRIGUES, H. M.
Affiliation: ZIANY NEIVA BRANDÃO, CNPA; CÉLIA REGINA GREGO, CNPTIA; TARCISIO MARCOS DE SOUZA GONDIM, CNPA; HUGO MACHADO RODRIGUES, UFRRJ.
Date Issued: 2024
Citation: Caderno Pedagógico, v. 21, n. 6, p. 1-21, 2024.
Description: Satellite images are valuable tools to assess the nutritional status of plants and, thus, understand the variability of cotton yield in farmers' fields. By identifying soil variability and nutritional crop reflectance, Precision Agriculture (PA) techniques enable more precise variable rate application of inputs such as fertilizers and pesticides. One important PA technique is geostatistics, resulting in interpolated maps that assist in evaluation during the crop cycle. These kriged maps provide a unique opportunity to overcome both spatial and temporal scaling challenges and understand the factors leading to crop yield. This study combines conventional statistical analysis, spatial regression modeling of georeferenced data, and vegetation indices assessment from medium-resolution satelitte images to support decisions on improving cotton yield. The experiments were conducted in a 44.8 ha commercial field in Goiás state, Brazil. Multispectral satellite images at 56 m spatial resolution were collected in a rainfed cotton field on 04/01/2011 and 04/10/2012 from the AWiF sensor during the peak flowering cotton stage. Measures of leaf nitrogen (N) and phosphorus (P) contents were determined over previously georeferenced central points of 70 plots of a regular grid, each one measuring 80X80 m. Using descriptive statistics and geostatistical analyses, data were analyzed by building and setting semivariograms and kriging interpolation. The best correlation was found between IVs and nitrogen contents of cotton leaves. Results indicated that NDVI, MSAVI, and SAVI were the best indices for estimating P contents at cotton peak flowering. Identifications of spatial differences were possible using geostatistical methods with remote sensing data obtained from medium-resolution satellite images, allowing the identification of distinct nutritional needs and growth status of canopy to cotton plants.
Thesagro: Algodão
Sensoriamento Remoto
Agricultura de Precisão
Satélite
Nutrição Vegetal
Produtividade
Insumo
Fertilizante
NAL Thesaurus: Kriging
Remote sensing
Precision agriculture
Cotton
Plant nutrition
Farm inputs
Pesticide application
Fertilizers
Keywords: Índices de Vegetação
Vegetation Indices
Variabilidade Espacial
Krigagem
Spatial Variability
Imagem de satélite
Satellite image
Dados georreferenciados
Georeferenced data
Análise Geoestatística
Geostatistical analysis
Productivity
Goiás
Consumo de pesticida
ISSN: 1983-0882
DOI: 10.54033/cadpedv21n6-293
Type of Material: Artigo de periódico
Access: openAccess
Appears in Collections:Artigo em periódico indexado (CNPA)

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