comparison of water use efficiency between some crops and medicinal species

increasing water use efficiency is one of the cases to arrivance to the stability production. in order to estimation and comparison of water use efficiency among crop species including corn, safflower, sesame ,and medicinal species including hemp, marsh mallow, white mallow. an experiment was conducted during 2009 growing seasons in the agriculture research station ferdowsi of mashhad. the experiments was white mallow established as a completely randomized block design with three replication and six treatments included six crop corn, safflower, sesame as crop plant and hemp, marsh mallow, white mallow as medicinal crop. results showed that the treatments had significant effect (p≤0/01). the highest value of water use efficiency were obtained in corn by 1/84 g per kilogram by 6770 m3 watered requirement and lowest value obtained in white mallow by 0/04 g per kilogram by 7530 m3 watered requirement. however the highest value of harvest index was 41/57 percent in marsh mallow and lowest value was 9/2 percent in marsh mallow.