Drought stress is a major environmental concern worldwide that limits crop growth on a large scale, and the use of biofertilizers and amino acid spraying is important to overcome this issue to improve crop production. For this purpose, a two-year study was conducted on
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Drought stress is a major environmental concern worldwide that limits crop growth on a large scale, and the use of biofertilizers and amino acid spraying is important to overcome this issue to improve crop production. For this purpose, a two-year study was conducted on Salvia officinalis L. in the form of split-split plots in a randomized complete block design with four replications in a farm located in Kangavar city of Kermanshah province. The treatments of this experiment were Irrigation at two levels [50 and 100% of field capacity (F.C.)] which was placed in the main plots. The sub-factor included biofertilizer with three levels (control, mycorrhiza and cow manure) in the subplots and the sub-factor included foliar application of L-phenylalanine at four levels [no foliar application (negative control), solution spraying with distilled water (positive control), spraying with concentrations of 25% and 50% L-phenylalanine]. The highest amount and yield of essential oil were related to the interaction effects of irrigation treatments of 100% field capacity + cattle manure + 50% of L-phenylalanine with amounts of 3.5% and 24.41 kg/ha, respectively. In addition, the interaction effects of irrigation treatments were 100% field capacity + mycorrhiza + 50% L-phenylalanine with values 3.6% and 23.65 kg/ha, respectively.
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