The Effect of Foliar Application of Potassium, Salicylic Acid and Gamma Amino Butyric Acid on Yield Components, Grain Yield and Nitrogen, Phosphorus and Potassium Uptake in Bread Wheat Genotypes under Soil Salinity Stress Conditions

The effect of foliar application of potassium, salicylic acid and gamma aminobutyric acid on morphophysiological traits and nutrient uptake of bread wheat genotypes under soil salinity stress was studied as a research conducted in agricultural research station in Miandoab, West Azerbaijan during the two cropping years 1396-97 and 1397-98. The experiment was performed as a split plot in a randomized complete block design with three replications under soil salinity (0 and 8 dS / m). Main plots included foliar application with growth stimulants: potassium, GABA, SA, control and subplots included seven genotypes ( Orum, Zare, Mihan, Heydari, MS-89-12, MS -89-13 and MS-91-14). The analysis of variance showed that the simple effects of salinity stress on grain yield and foliar application treatments on all studied traits were significant. Also, the simple effects of different genotypes on all measured traits were significant. The interactions of three factors of salinity, foliar application and genotype had a significant effect on all measured traits. Based on the results, comparison of the means showed that GABA foliar application under non-stress conditions with an average of 11366.7 kg / ha in Mihan cultivar produced the highest grain yield, while GABA foliar application under salinity stress conditions with the average of 1876.7 kg / ha produced the lowest grain yield in Orum cultivar. The overall results showed that most of the traits were reduced due to salinity stress. Foliar application of all the compounds in most traits caused an increase compared to the control conditions.