Effect of Foliar Spray of Zn-Golbar Commercial Combination on Biochemical and Yield traits in Fertile Kaleh-Ghouchi Pistachio Trees

These days, over the world, the farmers use fertilizers based on amino acids widely to increase the yield of their products and to reduce the destructive effects of stresses. The aim of this study was to evaluate foliar spray of 30-year-old pistachio trees using Zn-Golbar combination (70% glutamic amino acid, 10% urea and 20% zinc chelate) on biochemical traits, enzymatic antioxidant defense system, oxidative stress parameters and yield function on Kale-Ghouchi pistachio cultivar under field conditions. Four levels of Zn-Golbar including 0, 0.6, 1.2 and 1.8 g/ L water were selected as levels of treatmentand were sprayed on trees in April. The results showed that with increasing concentration of this combination, contents of total free amino acids, total soluble protein and proline in leaves increased in comparison with normal condition, significantly. Furthermore, with evaluation of the enzymatic antioxidant defense system, it was specified that catalase, ascorbate peroxidase, guaiacol peroxidase and phenylalanine ammonia-lyase enzymes activities in leaves increased with increasing concentration of this commercial combination and hence led to the decreasing content of oxidative stress parameters including hydrogen peroxide, malondialdehyde and other aldehydes. The results of this study showed that with increasing concentrations of this commercial combination, significant increasing was observed in the yield and yield-related parameters including fresh and dry weight of pistachio, flower buds and number of grains per panicle in comparison to the control condition, while ounces of pistachio reduced extremely. According to the results of this study, 1.8 g/L Zn-Gholbar can be introduced as a valuable fertilizer for increasing yield of Kaleh-Ghouchi pistachio cultivar by the foliar spraying.