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	Provedor de dados AGRIAMBI (1) Autor Hipple,James. D. (1) Scharf,Peter (1) Souza,Eduardo G. (1) Sudduth,Ken A. (1) Palavra-chave Cloud (1) Nitrogen management (1) Precision agriculture (1) Reflectance (1) Tipo do documento Info:eu-repo/semantics/article (1) Ano 2006 (1) País Brazil (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 1 Primeira ... 1 ... Última Using a field radiometer to estimate instantaneous sky clearness AGRIAMBI Souza,Eduardo G.; Scharf,Peter; Sudduth,Ken A.; Hipple,James. D.. Reflectance measurements of crop plants and canopies show promise for guiding within-season, variable-rate nitrogen (N) application. Most research results have been obtained around solar noon with clear skies. However, for practical application, the system must work under cloudy skies or away from solar noon. The objective of this work was to assess the effect of cloud conditions on reflectance measurements of a corn canopy. The approach was to estimate an instantaneous sky clearness index (ICI) which could be used to correct field radiometer data for variations in cloud cover, such that the same reflectance reading would be obtained (and the same N recommendation made) for the same plants regardless of cloud conditions. Readings were taken from morning... Tipo: Info:eu-repo/semantics/article Palavras-chave: Precision agriculture; Nitrogen management; Reflectance; Cloud. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662006000200018 Registros recuperados: 1 Primeira ... 1 ... Última

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