Calculation of evapotranspiration with a plant coefficient of one and two-component For the corn plant during the growing season

Subject Areas : Irrigation and Drainage

پیام کمالی ¹ , سید ابراهیم هاشمی گرمدره ²

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Received: 2021-04-21 Accepted : 2021-09-09 Published : 2020-11-01

Keywords: evapotranspiration, corn, ذرت, تبخیر- تعرق, Karaj, کرج, plant coefficient, ضریب گیاهی,

Abstract :

Determining the amount of evapotranspiration (plant water requirement) is an important component in determining water balance and irrigation budgeting. The aim of this study was to calculate the evapotranspiration of maize plants with one-component and two-component plant coefficients and compare them. The study area is the educational and research farm of the Agriculture and Natural Resources Campus of the University of Tehran. In this study, plant coefficient was calculated as one-component and two-component for maize during the 100-day growing period. This study was conducted in the educational and research farm of the Campus of Agriculture and Natural Resources, University of Tehran. The results showed that the greatest difference between the one-component and two-component plant coefficients and finally in the evapotranspiration calculated by these two coefficients for the corn plant is in the early stages of growth. Considering that in the two-component plant coefficient, the amount of evaporation in the early stages of growth, when the soil surface is bare, is considered, the total evapotranspiration rate calculated with the two-component plant coefficient (602) is greater than the total evapotranspiration rate Calculated with a one-component plant coefficient (557.5).

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