Evapotranspiração e disponibilidade hídrica em feijoeiro (Phaseolus vulgaris) sob estresse hídrico

• Autor(a) principal: Fischer Filho, João Alberto [UNESP]
• Data de Publicação: 2014
• Outros Autores: Zocoler, João Luis [UNESP], Poloni, Nadia Maria [UNESP], Furlani Júnior, Enes [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.7127/rbai.v8n500232; http://hdl.handle.net/11449/140837
• topic: Depth irrigation; Phenological stages of bean; Hydric deficit; Lâminas de irrigação; Fases fenológicas do feijoeiro; Deficiência hídrica

Why grow some season, the bean be is exposed to various weather conditions, and water deficiency is an important limiting factor to production. Therefore, the use of irrigation increases the production and allows the use of areas previously unsuitable due to reduced orirregular rainfall regimes. This experiment, conducted on potted plants in greenhouse, intended to measure evapotranspiration (ETr) and total available water (AW) of the beans under water stress relating them with the phenological stages. It was also evaluated the best model that represents the relationship between real and potential evapotranspiration among Veihmeyer & Hendrickson, Thornthwaite & Mather and Pierce. The experiment was completely randomized with six treatments (levels of hydric stress) and four replications, and a differential treatment which the soil surface was sealing. It was concluded that: i) the evaporation cycle of the culture was equal to 400, 378, 306, 251 and 198 mm, corresponding to total available water (AW) averaged 70.4%, 65.3%, 57.7 %, 43.5% and 33.5%, respectively; ii) the treatment which soil surface was sealed from the phenological stage V4 had AW = 68.3%, resulting in evapotranspiration of 248 mm; iii) Thornthwaite & Mather was the best model that adjusted the observed values.