Data/hora: 11/06/2024 04:45:44

Biblioteca(s): 	Embrapa Agropecuária Oeste; Embrapa Arroz e Feijão; Embrapa Cerrados; Embrapa Unidades Centrais.	
Data corrente: 	13/11/2006	
Data da última atualização: 	23/10/2009	
Autoria: 	RODRIGUES, L. N.; AZEVEDO, J. A. de; SOCCOL, O. J.; SILVA, E. M. da.	
Título: 	Modelo de Ritchie: descrição e aplicação.	
Ano de publicação: 	2005	
Fonte/Imprenta: 	Planaltina, DF: Embrapa Cerrados, 2005.	
Páginas: 	29 p.	
Série: 	(Embrapa Cerrados. Documentos, 133).	
Idioma: 	Português	
Conteúdo: 	ABSTRACT: Among the several methods used to manage irrigation, the ones based on the calculation of crop water consumption or evapotranspiration are the most common. From those, the one presented by Doorenbos e Pruitt (1977) is the most used. Based on this method, the crop evapotranspiration is calculated multiplying a crop reference evapotranspiration by a crop coefficient. Applying this methodology in some situations is not convenient, for instance, in the estimative of crop water use efficiency. Besides of this, a good estimative of crop coefficient is difficult and should be done for each region, once is site specific. Options to this method are the models that calculate the evaporation and transpiration separately. Among those, the one presented by Ritchie (1972) is the most popular. It was developed to calculate row crop evapotranspiration in situations where neither soil water deficit occur nor crop is in senescence stage. This model has been used successfully to estimate crop evapotranspiration under different climatic, soil and crop conditions. To use this model it is necessary to estimate two soil parameters. Even though the methodology to estimate these two parameters is of easy application. It is not widely known. The objectives of this paper were: i) to describe the Ritchie model and apply it to calculate the evapotranspiration of Cerrados' crop; and ii) to present methodologies to estimate both its soil parameter and the crop leaf are index.	
Palavras-Chave: 	Coeficiente de cultura; Uso da água.	
Thesagro: 	Evapotranspiração; Irrigação; Manejo; Manejo de Água.	
Thesaurus Nal: 	crop coefficient; evapotranspiration; irrigation; water management.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/CPAC-2009/27306/1/doc_133.pdf	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	AI-SEDE - (38452-1) - EMB - FL - -- - 09672 - CPAC - 09672 - DIS
AI-SEDE - (38452-2) - EMB - FL - -- - 09672 - CPAC - 09672a - DIS
CNPAF - (24817-1) - EMB - FL - -- - FOL 4615 -  - 2005.04615 - DIS
CPAO - (28260-1) - EMB - FL - -- - FOL 15081 -  - FOL 15081 - DIS
CPAC - (27306-1) - UMT - FL - -- - FOL7683 -  - CRI6928 - DIS
CPAC - (27306-2) - UMT - FL - -- - FOL7683 -  - DOC190 - DIS
CPAC - (27306-3) - UMT - FL - -- - FOL7683 -  - FOL7683 - DIS