Effect of selenium and some organic materials on morphophysiological traits and secondary metabolites of dill (Anethum graveolens L.)

Selenium, known as a key ingredient for human and animal health, can play an important role in the antioxidant mechanism in plants. Unfortunately, many plants fail to have enough selenium, which  has led to selenium enrichment. The aim of this study was to investigate the effect of selenium combined with fulvic acid and humic acid on nutritional value of dill. To this end, an experiment based on a completely randomized factorial design with three levels of fulvic acid and humic acid (0, 50 and 150 mmol/L) and selenium application at 5 levels (0, 6, 8, 12 and 16 mg/L) with three replications was conducted in a greenhouse. The results of this experiment showed that the effect of 50 mmol/L fulvic acids + 12 mg/L sodium selanate, was significant on morpho-physiological traits such as shoot and root dry weight, plant height, chlorophyll, essence,  amount of selenium,and antioxidant enzymes. The results indicate that selenium along with the acids increased and improved essential oilconstituents such as alpha-pinene (3.129%), beta-myrcene (2,231%), alpha-phellandene (46.14%) and carvone (74.83%).