Título:	Modelo de Ritchie: descrição e aplicação.
Autoria:	RODRIGUES, L. N. AZEVEDO, J. A. de SOCCOL, O. J. SILVA, E. M. da
Ano de publicação:	2005
Referência:	Planaltina, DF: Embrapa Cerrados, 2005.
Páginas:	29 p.
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.
Thesagro:	Evapotranspiração Manejo de Água Irrigação
NAL Thesaurus:	crop coefficient evapotranspiration irrigation water management
Palavras-chave:	Coeficiente de cultura
Série:	(Embrapa Cerrados. Documentos, 133).
Tipo do Material:	Folhetos
Acesso:	openAccess
Aparece nas coleções:	Série Documentos (CPAC)