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Providing water according to plant water requirement is a problem faced by many farmers because it’s related to cost of production and water scarcity. Some methods of calculating evapotranspiration are very difficult for farmers to use because they require some meteorological data. Simplifying the use of calculation equation is needed to make it easier for farmers to determine plant water requirements. The aims of study were to forecast evapotranspiration equation based on Hargreaves Evapotranspiration Method for Semangat Village. The methods divided two steps, they were observing potential evapotranspiration using Hargreaves Evapotranspiration method, and forecasting evapotranspiration equation. The results show potential evapotranspiration (ETo) in Semangat Village were 2.9 – 7.1 mm/days during January until July, 2020. Forecasted evapotranspiration equation for Semangat Village y = 0.444x – 4.0964 with R 2  = 0,435 for daily average temperature, y = 0.2265x – 1.9029 with R 2  = 0.8518 for daily maximum temperature, and y = -0.2137x + 8.6148 with R 2  = 0.1361 for minimum temperature. The conclusion shows that the formula y = 0.2265x – 1.9029 where x is daily maximum temperature is the best formula which can be used to forecast evapotranspiration in Semangat Village, Merdeka Sub-district, Karo Regency, North Sumatera Province, Indonesia.

iop conference series. earth and environmental science

Forecasting evapotranspiration equation based on Hargreaves Evapotranspiration Method for Semangat Village, Merdeka Sub-district, Karo Regency, North Sumatera Province, Indonesia