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| Bagheri,Nikrooz; Ahmadi,Hojjat; Alavipanah,Seyed Kazem; Omid,Mahmoud. |
| The objective of this work was to evaluate the use of multispectral remote sensing for site-specific nitrogen fertilizer management. Satellite imagery from the advanced spaceborne thermal emission and reflection radiometer (Aster) was acquired in a 23 ha corn-planted area in Iran. For the collection of field samples, a total of 53 pixels were selected by systematic randomized sampling. The total nitrogen content in corn leaf tissues in these pixels was evaluated. To predict corn canopy nitrogen content, different vegetation indices, such as normalized difference vegetation index (NDVI), soil-adjusted vegetation index (Savi), optimized soil-adjusted vegetation index (Osavi), modified chlorophyll absorption ratio index 2 (MCARI2), and modified triangle... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aster; Nitrogen content; Near infrared; Multispectral response; Precision agriculture; Vegetation indices. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013001000011 |
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| Chagas,César S.; Vieira,Carlos A. O.; Fernandes Filho,Elpídio I.; C. Júnior,Waldir de. |
| Este trabalho teve por objetivo avaliar a eficiência dos classificadores redes neurais artificiais (RNA) e o de máxima verossimilhança (Maxver) na classificação do uso da terra no município de Viçosa, MG, a partir de imagens do sensor ASTER, com ênfase nos níveis de degradação das pastagens. Neste estudo, foram identificados três níveis de degradação das pastagens (moderado, forte e muito forte) e avaliada uma composição da imagem do sensor ASTER contendo as 3 bandas do visível e infravermelho próximo, com resolução espacial de 15 m. O simulador de redes neurais empregado foi o "Java Neural Network Simulator" e o algoritmo de aprendizado, o backpropagation. Os resultados mostram que a classificação por redes neurais, embora apresente resultado ligeiramente... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aster; Sensoriamento remoto; Classificação supervisionada. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662009000300014 |
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| Pivetta,Kathia Fernandes Lopes; Mattiuz,Claudia Fabrino Machado; Melo,Regina Ferreira de; Gimenes,Renata; Romani,Gustavo de Nobrega; Batista,Gisele Sales. |
| ABSTRACT: Aster (Aster ericoides L.) is a flower crop of North American origin, which belongs to the family Asteraceae. This plant presents capitulum-type inflorescences, widely used as cut flowers. In Brazil, it has been grown only recently, but still has a high expansion potential. In floriculture, pulsing and conditioning solutions are often used to extend the vase life of cut flowers. The present study aimed to evaluate the influence of silver thiosulphate (STS) pulsing and sucrose solutions on the postharvest life of A. ericoides stems. The experiment was carried out under a complete randomized design with treatments arranged in a 2x5 factorial scheme. Treatments consisted of flower stems treated with STS pulsing for 30 minutes, combined with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water relations; Vase life; Pulsing; Aster. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200202 |
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