Resumo

HERRERA-PUEBLA, Julián et al. Determination of Crop Coefficients for Estimating Evapotranspiration in a Paddy Field in Cuba. Rev Cie Téc Agr [online]. 2020, vol.29, n.3, pp.5-20.  Epub 01-Set-2020. ISSN 2071-0054.

Using crop evapotranspiration (ETc) data obtained in lysimeters in rice fields of the western region of Cuba and the reference evapotranspiration (ETo) calculated by the Penman-Monteith (FAO PM), Hargreaves (Hag) formulas, the evaporation of the Class A evaporimeter tank modified by the coefficient of the tank (Eo Kp) and evaporation of the tank (Eo), the Kc of Amistad and J-105 rice varieties were determined with cycles of 130 days, sown in the months of March and April during years 1987 to 1989.The average ETc for both varieties and years was 820 mm (6.8 mm day-1) for an average cycle of 133 days, while the ETo was 624 (4.19 mm day-1) , 420 (3.86 mm dia-1), 600 (4.73 mm dia-1) and 814 (5.49 mm dia-1) calculated using the formulas FAO PM, Hag, EoKp and Eo, respectively, with R2 coefficients significant for comparisons with each other of all ETo calculation methods. The ten-year Kc increase from the beginning to obtain a maximum of 1.5 and 1.4 for varieties J-105 and Amistad from 80 to 110 days of growth and then descend to 1.3 and 1.2 for both varieties at the end of the cycle. Given the little difference between varieties, a Kc is proposed for the crop according to its phases of 0.8, 1.2, 1.4 and 1.3 for the initial, vegetative, reproduction and final phases, respectively. The validation of these coefficients for other regions of the country is suggested.

Palavras-chave : Efficient Management; Water; Lysimeter; Tank Coefficient.

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