Comparison Between Corn Evapotranspiration Rates by the Modified Bowen Ratio and the Ceres-Maize Model

• Autor(a) principal: Bianchini, Vitor de Jesus Martins
• Data de Publicação: 2017
• Outros Autores: Souza, Tamires Teles de, Pereira, Rodolfo Armando de Almeida, Marin, Fábio Ricardo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Geama
• Texto Completo: https://www.journals.ufrpe.br/index.php/geama/article/view/1506
• topic: Irrigation; climate; water

Corn stands out among grains because of its high global importance due to its chemical composition, nutritional value and productive potential. Several factors influence corn crop performance, and climate poses the greatest challenges for crop planning and management. Although tolerant to water deficit, the corn plant presents high sensitivity to water scarcity in specific developmental stages. Therefore, knowing factors related to water loss, namely potential or reference evapotranspiration (ET0) and Evapotranspiration (ETc) is crucial. This work aimed to calculate the ET0 by the methods of Priestley and Taylor (1972) and Penman-Monteith and ETc of the corn crop, both using the CERES-MAIZE model, and compare them with the results observed by the Modified Bowen Ratio method.The field experiment was conducted in the experimental area of ESALQ / USP and sensors were installed for data collection. For the comparison of results, the CERES-MAIZE model, duly calibrated for the experimental conditions, was used. The results showed that ET0 was underestimated by the Penman-Monteith method and overestimated by the Priestley and Taylor method through the CERES-MAIZE model throughout the crop cycle. However, at the cycle end, the accumulated values were lower than those measured by the MBR method.