期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2014
卷号：3
期号：1
页码：8765
出版社：S&S Publications
摘要：Agricultural planning relying on evapotranspiration suffers due to inaccuracy in its estimation. The non- availability of meteorological parameters required for accurate estimation of reference evapotranspiration (ET o ) resulted in the development of different methods of ET o estimation. The present study compares various universally accepted met hods of ET o estimation by considering the Penman Monteith as a standard method. Co mparative analysis indicated the suitability of Hargreaves (1985) metho d followed by Christiansen (1968) method and Pan Evaporation method (1977) . The improvement in ET o estimation was carried out through transformation of standard equations using single or multi parametric approach after analyzing dependency and sensitivity o f different meteorological paramet ers on ET o . The developed transformed models indicated that during ET o estimation morning time relative humidity (RH 1 ) can play the dominant role (99%). ET o estimation by combination of bright sunshine hours and wind speed (WV) exhibit better role (98.8%) than the co mbination of minimum temperature (Tmin) and WV (98.6%)
