Effect of Organic and Chemical Fertilizers and Foliar Application of Amino acid on Growth and Yield Indices of ' Akbari ' Pistachio (Pistacia vera L.)

The aim of this study was to investigate the effect of organic amendments, phosphorus and amino acid as a factorial experiment in a randomized complete block design with three replications on Akbari cultivar of pistachio. Treatments include six levels of organic and chemical fertilizers (no application (F1), 20ton/ha cow manure (F2), 15ton/ha cow manure+5ton/ha poultry manure (F3), 10ton/ha cow manure+4ton/ha poultry manure+6ton/ha pistachio waste biochar (F4), 20ton/ha cow manure+300kg/ha of diammonium phosphate (F5), 20ton/ha cow manure+300kg/ha of triple superphosphate (F6)) and three levels of amino acid foliar application (0 (AA0), 60 (AA60) and 120ppm (AA120)). The results showed that the simultaneous application of F6 and AA120 led to a significant increase in chlorophyll, number of spikes, fresh and dry weight of pistachios, number of seeds per spike, concentration of phosphorus and potassium and decrease in Na/K compared to control and their separate application. F6 treatment led to a significant increase in branch length and diameter, leaf area, weight of hundred seeds, laughing percentage and relative water content (17.6, 41.9, 52.8, 21.7, 38.1 and 51.9%, respectively) significantly decreased number of pistachio in one ounce and percentage of emptiness (10.9% and 42.8%, respectively). Application of AA120 significantly increased leaf area compared to the control. Mixing cattle, poultry and biochar fertilizers of pistachio wastes (F4) along with AA60 and AA120 had a positive effect on number of cluster, fresh and dry weight of pistachios. Simultaneous application of cow manure, superphosphate triple and amino acid seems to have a positive effect on pistachio yield.