Assessing reference evapotranspiration by the Hargreaves method in north-eastern Italy

The Food and Agriculture Organization of the United Nations proposed the (FAO)-56 Penman–Monteith equation (FAO-56 PM) as the standard method for estimating reference evapotranspiration (ET0). This equation requires weather data which are not available in most stations or present wide gaps and/or inaccuracies in their measurement. To solve this problem, the Hargreaves equation (HARG) is recognized by FAO and is often used. This equation is based...