Determination of Actual Evapotranspiration, Crop Coefficients and Water Use Efficiency of Garlic in Azarshahr Region

It is intended to optimize crop yields and economics of crop water use by irrigation. Implementing proper water use management by agricultural sector reduces water losses and increases distribution uniformity and crop yield. In order to improve water use management in agriculture, it is essential to determine crop water requirements of various crops with the required level of accuracy. The objective of this research was to determine garlic evapotranspiration, crop coefficients and water use efficiency in the Azarshahr region located in the eastern Azerbaijan province. The actual garlic evapotranspiration (ETa.o-s) was determined by the hydrological method, measuring the various components of water balance at the farm level including soil moisture at various soil depths and irrigation depths. The garlic actual seasonal evapotranspiration was 552 mm and its water use efficiency was 3.47 kg per cubic meter of evapotranspiration during the growing season. The garlic crop coefficients for the mid-season and late season stages were 1.37 and 0.57, respectively, when reference evapotranspiration was computed by the Penman-Monteith equation (FAO 56).