NDLI: Caracterização Espectral Da Cana-de-açúcar Infectada Por Nematoides E Migdolus Fryanus Por Espectrorradiometria De Campo

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Caracterização Espectral Da Cana-de-açúcar Infectada Por Nematoides E Migdolus Fryanus Por Espectrorradiometria De Campo

Content Provider	Semantic Scholar
Author	Martins, George Deroco Galo, Maria De Lourdes Bueno Trindade
Copyright Year	2015
Abstract	O cultivo da cana-de-acucar no Brasil, embora assistido por tecnicas modernas de plantio, e alvo constante de parasitas do sistema radicular. Por registrar seletivamente o fluxo espectral da radiacao eletromagnetica refletida pela vegetacao, o sensoriamento remoto tornou-se uma poderosa ferramenta na deteccao das plantas infectadas por patogenos do solo. Com o objetivo de caracterizar espectralmente a cana-de-acucar sadia e infectada por nematoides e pela larva do besouro Migdolus fryanus, foram tomadas medidas radiometricas in situ e geradas curvas hiperespectrais de plantas sadias e infectadas. Tecnicas especificas de analise espectral, como a determinacao da posicao da borda do vermelho limitrofe (Red Edge Position Determination – REPD) e diferentes indices espectrais foram avaliados para discriminar as tres ocorrencias. As curvas de reflectância mostraram diferencas em magnitude principalmente nos comprimentos de onda do vermelho e infravermelho proximo e, assim como a determinacao do REP e os indices de clorofila b, NDVI, MCARI e TCARI, permitiram distinguir apenas entre plantas sadias e infectadas. As razoes espectrais sensiveis aos pigmentos clorofila a e carotenoides, porem, discriminaram as tres ocorrencias, inclusive plantas infectadas por nematoides e Migdolus fryanus. A melhor discriminacao foi obtida com o indice de carotenoides, um pigmento fortemente relacionado com estresse da planta.
Starting Page	783
Ending Page	796
Page Count	14
File Format	PDF HTM / HTML
DOI	10.1590/S1982-21702015000400046
Volume Number	21
Alternate Webpage(s)	https://revistas.ufpr.br/bcg/article/download/44397/26870
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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