Evapotranspiration and water availability at bean (Phaseolus vulgaris) under water stress

• Published in: Revista brasileira de agricultura irrigada 2014-09, Vol.8 (5), p.366-374
• Main Authors: Fischer Filho, João Alberto, Zocoler, João Luís, Poloni, Nadia Maria, Júnior, Enes Furlani
• Format: Article
• Language: English
• ISSN: 1982-7679
• DOI: 10.7127/rbai.v8n500232

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 or irregular 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.