Effects of Salinity Stress and Foliar Application of Nano-Zinc oxide on Yield per Plant and Some Morphophysiological Traits of Barley (Hordeum vulgare L.)

In order to investigate effects of salinity stress and foliar application with Nano-Zinc oxide on yield per plant and some morphophysiological traits of barley (Hordeum vulgare L.), a factorial experiment based on randomized complete block design with three replications was conducted under controlled conditions in 2012. Experimental factors were included soil salinity in four levels (zero, 25, 50 and 75 mM) with NaCl and foliar application of Nano-Zinc oxide at four levels (zero as control, 0.25, 0.5 and 0.75 g l-1). The results showed that increasing of salinity stress decreased yield, grain filling period, chlorophyll content and stomata conductivity. It was vise versa in foliar application of Nano-Zinc oxide. Increasing of soil salinity and no foliar application increased dry matter remobilization. Maximum of dry matter remobilization from stem and aerial vegetative organs (0.445 and 0.199 g per plant respectively) was obtained in salinity of 75 Mm and no foliar application of Nano-Zinc oxide. Results showed that maximum of yield per plant (1.22 g), grain filling period (30.67 days), chlorophyll content (53.2) and stomata conductance (23.7 mmol m-2.s-1) were obtained in 0.75 g l-1 of Nano-Zinc oxide and without of salinity application and minimum were obtained in no foliar application and salinity of 75 Mm. In general, the results showed that is useful foliar application of 0.75 g/lit of Nano-Zinc oxide in order to increasing of yield under salinity condition.