Índice de vegetação no algodoeiro sob diferentes doses de nitrogênio e regulador de crescimento

Motomiya, Anamari Viegas de Araújo; Valente, Igor Moraes Queiroz; Molin, José Paulo; Motomiya, Wagner Rogério; Biscaro, Guilherme Augusto; Jordan, Rodrigo Aparecido

doi:10.5433/1679-0359.2014v35n1p169

Cited by 11 publications

(11 citation statements)

References 11 publications

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“…O nitrogênio assimilado foi incorporado a moléculas de clorofila tornando as folhas do algodoeiro mais verdes refletindo no índice SPAD. (MOTOMIYA et al, 2014). De acordo com a Figura 1(B), a maior tonalidade de verde representa os maiores índices SPAD que variam na faixa de 40 a 90 kg ha -1 de nitrogênio.…”

Section: Resultsunclassified

“…Índice SPAD aos 48 DAA para a cultura do algodão submetido em diferentes doses de nitrogênio e níquel (A) Superfície de resposta e (B) Mapa de contorno. Motomiya et al (2014), também obteve uma relação quadrática e significativa para as doses de nitrogênio e para o índice SPAD, com decréscimo para a dose de 150 kg ha -1 de N e ponto máximo para a dose de 53,75 kg ha -1 de nitrogênio em cobertura.…”

Section: Resultsunclassified

“…As leituras efetuadas por este equipamento indicam valores proporcionais de clorofila na folha e são calculadas com base na quantidade de luz transmitida pela folha em dois comprimentos de ondas com distintos absorbâncias de clorofila (BRITO et al, 2011). A utilização do parâmetro teor de clorofila, apresenta grande potencial como indicador para a recomendação de adubação nitrogenada para o algodoeiro, principalmente se associado a indicadores de solo (ROSOLÉM e van MELLIS, 2010;MOTOMIYA et al, 2014).…”

Section: Introductionunclassified

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Diagnóstico Da Exigência Do Algodoeiro Em Nitrogênio E Níquel Pela Utilização Do Medidor Portátil De Clorofila

Barcelos

Furlani

Reis

et al. 2016

Revista Brasileira De Engenharia De Biossistemas

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Section: Resultsunclassified

Section: Introductionunclassified

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Diagnóstico Da Exigência Do Algodoeiro Em Nitrogênio E Níquel Pela Utilização Do Medidor Portátil De Clorofila

Barcelos

Furlani

Reis

et al. 2016

Revista Brasileira De Engenharia De Biossistemas

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“…Engenharia Agrícola, Jaboticabal, v.39, special issue, p.33-40, sep. 2019 The GreenSeeker is an active optical sensor (Trimble brand model 500) with a reading time between 1 and 2 s. This sensor emits electromagnetic radiation with a wavelength in the red (660 nm) and near-infrared (NIR; 770 nm) bands, and the light reflected by the plant is captured by the sensor. GreenSeeker automatically calculates the NDVI (Motomiya et al, 2014;Amaral et al, 2015a). The other obtained index along with the NDVI was the IRVI, which is still rarely used in research.…”

Section: Methodsmentioning

confidence: 99%

Correlations Among Vegetation Indices and Peanut Traits During Different Crop Development Stages

et al. 2019

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Active optical sensors have been widely used for the spatial and temporal monitoring of peanut culture because they are accurate, non-destructive methods for rapidly obtaining data. The objective of this study was to determine the optimal stage of crop growth for collecting sensor readings based on correlations between quality indicators. In addition, we compared vegetation indices (Normalized Difference Vegetation Index [NDVI], Normalized Difference Red-Edge Index, [NDRE], and Inverse Ratio Vegetation Index, [IRVI]) by monitoring temporal variability in the peanut crop in order to determine which of them obtained the best reading quality throughout the process. The experiment was performed on the 2016/17 crop in the agricultural area of the municipality of Dumont in the state of São Paulo, Brazil. The experimental design was based on the basic assumptions of statistical quality control and contained 63 sample points in a 30 × 30 m grid. The parameters were evaluated at 30, 45, 60, 75, and 119 days after sowing (DAS) using proximal sensing with GreenSeeker and OptRX sensors. We found that 45 and 60 DAS were the optimal times for monitoring peanut crop variability. For spatiotemporal monitoring of the culture with control charts, NDRE showed the best readings throughout the process when compared to NDVI and IRVI.

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“…According to Motomiya et al (2014), VIs are generally related to biomass, chlorophyll content and the productive potential of plants.…”

mentioning

confidence: 99%

Characterisation of the Spectral-Temporal Pattern of the Crambe Crop Using Hyperspectral Sensors

Viana¹,

Mercante²,

Felipetto³

et al. 2017

JAS

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Crambe is an oleaginous plant mainly cultivated in Brazil due to its oil characteristics that provide stability to oxidation, qualifying it for the use in a variety of products. Understanding the spectral-temporal pattern of the crambe crop is important to identify and quantify already cultivated areas via remote sensing. This study spectrally characterised the plant, seeking to relate the spectral pattern to the phenological stages of the crop throughout its development. The spectral information was obtained by passive terrestrial sensors in two harvests, thus generating a spectral-temporal pattern and the crambe temporal profile through the vegetation indices NDVI and SAVI. During the phenological stages of the seedling and the beginning of the vegetative growth, the red spectral band showed higher values of reflectance; this occurred because the crop had not yet completely covered the soil. Stages at the end of the vegetative growth and the beginning of the flowering, there was a higher reflectance in the near infrared and a lower reflectance in the mid-infrared. For the granulation and maturation stages, the reflectance in the mean and near infrared reduced due to leaf senescence and loss of cellular water content. The NDVI and SAVI temporal profiles demonstrate linear growth up to the vegetative peak, which occurs between the end of the phenological stage of the vegetative growth and the beginning of the flowering and highest amount of green biomass. At the beginning of grain formation and filling, yellowing of leaves and senescence, granulation and maturation stages, the values reduced.

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Índice de vegetação no algodoeiro sob diferentes doses de nitrogênio e regulador de crescimento

Cited by 11 publications

References 11 publications

Diagnóstico Da Exigência Do Algodoeiro Em Nitrogênio E Níquel Pela Utilização Do Medidor Portátil De Clorofila

Diagnóstico Da Exigência Do Algodoeiro Em Nitrogênio E Níquel Pela Utilização Do Medidor Portátil De Clorofila

Correlations Among Vegetation Indices and Peanut Traits During Different Crop Development Stages

Characterisation of the Spectral-Temporal Pattern of the Crambe Crop Using Hyperspectral Sensors

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