Abstract
ABSTRACT Optimization of water use in agriculture is fundamental, particularly in regions where water scarcity is intense, requiring the adoption of technologies that promote increased irrigation efficiency. The objective of this study was to evaluate evapotranspiration models and to estimate the crop coefficients of beet grown in a drainage lysimeter in the Agreste region of Alagoas. The experiment was conducted at the Campus of the Federal University of Alagoas - UFAL, in the municipality of Arapiraca, AL, between March and April 2014. Crop evapotranspiration (ETc) was estimated in drainage lysimeters and reference evapotranspiration (ETo) by Penman-Monteith-FAO 56 and Hargreaves-Samani methods. The Hargreaves-Samani method presented a good performance index for ETo estimation compared with the Penman-Monteith-FAO method, indicating that it is adequate for the study area. Beet ETc showed a cumulative demand of 202.11 mm for a cumulative reference evapotranspiration of 152.00 mm. Kc values determined using the Penman-Monteith-FAO 56 and Hargreaves-Samani methods were overestimated, in comparison to the Kc values of the FAO-56 standard method. With the obtained results, it is possible to correct the equations of the methods for the region, allowing for adequate irrigation management.
Highlights
Native to Europe, beet (Beta vulgaris L.) is an herbaceous, dicotyledon plant belonging to the Chenopodiaceae family
know the crop coefficient (Kc) determination requires the application of some method to estimate or measure ETo and the knowledge on crop evapotranspiration (ETc) (Miranda et al, 2016)
ETo data resulting from the application of the presented method were subjected to statistical analysis
Summary
Native to Europe, beet (Beta vulgaris L.) is an herbaceous, dicotyledon plant belonging to the Chenopodiaceae family. It is a vegetable with great economic importance in Brazil and one of the top ten vegetable crops cultivated (Sediyama et al, 2011). The study on beet is of great importance, especially regarding its water requirements (Lacerda & Turco, 2015). Studies comparing reference evapotranspiration (ETo) estimation methods in comparison to the Penman-Monteith method parameterized by FAO have been conducted in different regions of Brazil to evaluate the efficiency of indirect methods (Cavalcante Júnior et al, 2011; Borges Júnior et al, 2012; Silva et al, 2014b; Tanaka et al, 2016)
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