The effects of some plant growth biostimulants on the yield and nutrient concentration of pomegranate leaves (Punica granatum L.) cultivar Ghojagh, under low irrigation conditions

In order to investigate the effects of using some growth biostimulants in low irrigation in pomegranate (Ghojagh cultivar), a two-year experiment, from March 2018, in a split plots design and in randomized complete blocks array, was carried out in Qom. The main plots included irrigation based on the irrigation SWAT model and 70 percent of it. The sub-plots were1-control (based on soil test), 2-treatment 1+ foliar application of amino acid in concentration of 5 gram.lit-1, 3-treatment 1+ soil-use of humic acid, 4-treatment 1+ foliar application of folvic acid in concentration of 5 gram.lit-1 5- treatment1+ foliar application of seaweed extract in concentration of 5 gram.lit-1 6- consumption of Mycorrhiza in the form of hole-layed and 7- combination of treatments 2, 3, 5 and 6. The results of the experiment showed that the effects of irrigation treatment on the characteristics such as number of fruits per tree, acidity of fruit juice and all nutrients, except nitrogen, were significant. Also, the effects of growth biostimulants on all the studied characteristics such as yield and number of fruits per tree, acidity of fruit juice, percentage of soluble solids and concentration of all macro and micro elements were significant. The highest fruit yield.tree-1, hectare-1 and the number of fruits.tree-1 were obtained using seaweed and 70% irrigation in the first year of the experiment with 29.2 kg and 29200 kg.ha-1 and 96.66, respectively.In total, the results showed that reducing the amount of irrigation water calculated based on the water requirement of pomegranate up to 30%, did not have a significant effect on fruit yield and some characteristics of pomegranate. The consumption of biostimulants influenced the yield and some characteristics of pomegranate.