Comparison of four methods for estimating evapotranspiration of rice (Oryza sativa L.) under tropical conditions.

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DOI:

https://doi.org/10.25127/agrops.20251.1137

Keywords:

water demand, rice, evapotranspiration, crop coefficient, water management

Abstract

Accurate estimation of water demand is essential for the efficient management of irrigation in agricultural crops. Consequently, this study evaluated the water demand of rice cultivation in the Mocache canton, Ecuador, using four estimation methods. A completely randomised design was employed with four treatments: T1 (drainage lysimeter), T2 (Penman-Monteith), T3 (Class A evaporation pan), and T4 (Hargreaves). The experiment was conducted over a 10-week period, with three weekly measurements performed on the experimental tanks. Statistical analysis included ANOVA and Tukey’s test (p≤0.05). The results showed that the drainage lysimeter recorded a cumulative evapotranspiration of 208.34 mm throughout the experimental period, from panicle development to maturation. Likewise, the Penman-Monteith method produced a similar estimate (212.54 mm), while the Hargreaves and Class A evaporation pan methods did not show significant statistical differences compared to the former. Additionally, crop coefficients (Kc) ranged from 0.94 in week 9 to 1.23 in week 13, then decreased to 1.01 in week 18, consistent with the FAO reference values. Therefore, it is concluded that the drainage lysimeter provides the most accurate estimation of rice water demand.

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Published

2025-11-25

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How to Cite

Comparison of four methods for estimating evapotranspiration of rice (Oryza sativa L.) under tropical conditions. (2025). Revista De Investigación De Agroproducción Sustentable, 7(1), 68-77. https://doi.org/10.25127/agrops.20251.1137

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