A.R.Zareiee, M. Jafari, A. Tavili, H. Azarnevand and G.R. Zehtabian
Abstract
Atriple lentiformis is one of the most important plants that use to rangeland management in the wide areas of Iran. For a suitable irrigation management programming (in the implant initial stages), the awareness of crop coefficient (Kc) and water requirement is essential. The ratio of actual evapotranspiration to reference crop evapotranspiration is defined as crop coefficient. A study was conducted to determine the crop coefficients of (Atriplex lentiformis) in the Kowsar research station in Fars province during 2013 and 2104. For this purpose, three water balance drainable lysimeters with diameter of 0.70 m and a height of 1.10 m were used. In this regard, to calculate potential evapotranspiration, the Penman Monteith equation for potential evapotranspiration and water balance equation to measure actual evapotranspiration were used. Finally, the values of crop coefficients for different (Atriplex lentiformis) initial, development, middle and end stages were determined as 0.21, 0.9, 1.2and 1.05.