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               <mods:abstract>Nos últimos tempos os dados de teledetecção&#xd;
tornaram-se disponíveis aos agricultores sob a forma de&#xd;
índices espectrais e são disponibilizados por empresas&#xd;
de serviços, assim como alguns serviços públicos&#xd;
gratuitos. O índice mais conhecido e mais amplamente&#xd;
utilizado é o NDVI, que fornece ampla informação sobre a&#xd;
cobertura vegetal e, em certa medida, sobre a biomassa&#xd;
do campo. Esta tecnologia relativamente nova fornece&#xd;
informações que podem ser úteis para detetar problemas&#xd;
nas culturas, embora com algumas limitações. As culturas&#xd;
de inverno, devido às suas características físicas, podem&#xd;
beneficiar muito com a utilização desta tecnologia.</mods:abstract>
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