Data/hora: 05/06/2024 08:54:21

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Albedo and estimates of net radiation for green beans under polyethylene cover and field conditions	
Autores: 	Souza,José Leonaldo de; Escobedo,João Francisco; Tornero,Maria Terezinha Trovareli.	
Data: 	1999-10-01	
Ano: 	1999	
Palavras-chave: 	Phaseolus vulgaris; Solar radiation.	
Resumo: 	This paper describes the albedo (r) and estimates of net radiation and global solar irradiance for green beans crop (Phaseolus vulgaris L.), cultivated in greenhouse with cover of polyethylene and field conditions, in Botucatu, SP, Brazil (22º 54' S; 48º 27' W; 850 m). The solar global irradiance (Rg) and solar reflected radiation (Rr) were used to estimate the albedo through the ratio between Rr and Rg. The diurnal curves of albedo were obtained for days with clear sky and partially cloudy conditions, for different phenological stages of the crop. The albedo ranged with the solar elevation, the environment and the phenological stages. The cloudiness range have almost no influence on the albedo diurnal amount. The estimation of radiation were made by linear regression, using the global solar irradiance (Rg) and net short-waves radiation (Rc) as independent variables. All estimates of radiation showed better adjustment for specific phenological periods compared to the entire crop growing cycle. The net radiation in the greenhouse has been estimated by the global solar irradiance measured at field conditions.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999001000002	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/S0100-204X1999001000002	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.34 n.10 1999	
Fonte: 	info:eu-repo/semantics/openAccess