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Provedor de dados:  AGRIAMBI
País:  Brazil
Título:  Radiation balance of coffee hedgerows
Autores:  Angelocci,Luiz R.
Marin,Fábio R.
Pilau,Felipe G.
Righi,Evandro Z.
Favarin,José L.
Data:  2008-06-01
Ano:  2008
Palavras-chave:  Correlation
Instrumentation
Solar radiation
Net radiation
Resumo:  The radiation balance of hedgerows is an important variable in studies of mass and energy exchanges between parcial ground cover crops and the atmosphere. This paper describes a device with eight net radiometers encompassing the plants of a hedgerow. The radiometers were moved along a length of hedgerow, in a continuous and reversible movement. The canopy net radiation in this length (Rnc) was found by integration of the measurements over the notional cylinder formed. The device showed good performance and provided reliable measurements of Rnc of coffee hedgerows, showing itselfto be an useful technique of measurement in field conditions. Good correlations between Rnc and global solar radiation, turfgrass and coffee crop net radiation were found in 15-min, daytime and 24-hr periods, allowing the possibility of estimating Rnc from these simple measurements. Beer’s law was also used to have an independent estimation of Rnc. A good agreement was found between values of Rnc estimated by this law of attenuation and those integrated by the device in periods of 15 min, with overestimation of 10%, whereas for values integrated over daytime periods the agreement was not satisfactory.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662008000300008
Editor:  Departamento de Engenharia Agrícola - UFCG
Relação:  10.1590/S1415-43662008000300008
Formato:  text/html
Fonte:  Revista Brasileira de Engenharia Agrícola e Ambiental v.12 n.3 2008
Direitos:  info:eu-repo/semantics/openAccess
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