Research Institute of Forestes and Rangelands Iranian Journal of Range and Desert Research 1735-0875 19 1 2012 05 21 Evapotranspiration Estimation Using Climatic Data, Plant Characteristics and Cropwat 8.0 Software (Case Study: Steppic Region of MarkaziProvince, Roodshore Station) Evapotranspiration Estimation Using Climatic Data, Plant Characteristics and Cropwat 8.0 Software (Case Study: Steppic Region of MarkaziProvince, Roodshore Station) 1 16 103063 10.22092/ijrdr.2012.103063 FA Ali Ehsani Hosein Arzani Mahdi Farahpur Hassan Ahmadi Mohammad Jafari Mortezah Akbarzadeh Journal Article 2015 11 25 In this study, potential and actual evapotranspiration were estimated by Penman- Matis using climatic data of Saveh Station, and plant and soil characteristics were estimated by Cropwat 8.0 software. Our results showed that potential evapotranspiration in growing season was 6.16 times greater than the average of actual evapotranspiration. Actual evapotranspiration was 1.18 times greater than the average precipitation of growing season. It means that plant species have used the stored moisture for actual evapotranspiration. According to the estimation of actual evapotranspiration in a ten-year period, a model was provided for forage production as Ya= 74.30+ 2.698 (ETact). Accordingly, average forage production of the studied site was estimated as 257 kg/hec. It could be said that actual evapotranspiration as an index for climate yield is one of the fundamental factors in improving water use efficiency. Application of the mentioned climate index in different estimation models of long term forage production could be considered in order to determine the rangeland grazing capacity and developing rangeland insurance as a replacement for the usual methods of production. <br />  In this study, potential and actual evapotranspiration were estimated by Penman- Matis using climatic data of Saveh Station, and plant and soil characteristics were estimated by Cropwat 8.0 software. Our results showed that potential evapotranspiration in growing season was 6.16 times greater than the average of actual evapotranspiration. Actual evapotranspiration was 1.18 times greater than the average precipitation of growing season. It means that plant species have used the stored moisture for actual evapotranspiration. According to the estimation of actual evapotranspiration in a ten-year period, a model was provided for forage production as Ya= 74.30+ 2.698 (ETact). Accordingly, average forage production of the studied site was estimated as 257 kg/hec. It could be said that actual evapotranspiration as an index for climate yield is one of the fundamental factors in improving water use efficiency. Application of the mentioned climate index in different estimation models of long term forage production could be considered in order to determine the rangeland grazing capacity and developing rangeland insurance as a replacement for the usual methods of production. <br />  https://ijrdr.areeo.ac.ir/article_103063_73332e860c208572a1c737165f480154.pdf