Effect of Deficit Irrigation on Yield and Yield Components of Two Different Species of Balangu (Lallemantia royleana & iberica) from Mashhad and Urmia

To evaluate the effect of drought stress on yield، yield components and some physiological characteristics of Lallemantia sp، an experiment was conducted as split plot in randomized complete block design with three replications. The first factor was irrigation system in two levels 40 % and 60% depletion of available soil water، the second factor was L. iberica and L. royleana and the third factor was the origin of ecotypes، at two levels، Urmia and Mashhad. The results showed that drought stress had significant effect on Leaf Area Index (LAI) though with increment of water depletion، the LAI decreased 24. 2%. The highest LAI was in L. iberica، with 2. 99. L. royleana with 0. 0088 mg. g-1، had the highest chlorophyll a content in compared to L. iberica with 0. 008 mg. g-1 chlorophyll a content. The maximum number of capsules was related to 40% depletion of available soil water، L. iberica and Mashhad ecotype. The highest grain yield with an average of 208. 4 kg per hectare obtained at 40% depletion of available soil water and related to L. iberica with an average of 189. 4 kg. h-1. The yield of 60% depletion of available water in the soil was 107. 3 kg. h-1declined by 43. 84% in compared to 40% depletion of available soil water. Significant difference was seen between ecotypes of L. iberica in terms of grain yield. Mashhad ecotype showed the highest grain yield. There was a significant positive correlation in grain yield، LAI، chlorophyll a content and thousand seed weight.