Investigating the effect of humic acid solution and magnesium nanoparticles on the physiological properties and yield of the medicinal plant Stevia (Stevia rebaudiana L.)
Subject Areas : Medicinal plants
ُُSeyed Mohsen Seyedlar
1
,
Hamid Mozafari
2
*
,
Faezeh Rajabzadeh
3
,
بهزاد ثانی
4
,
Touraj Rahimi
5
1 - Department of Agronomy, ShQ.C., Islami Azad University ,Shahr-e Qods, Iran
2 - Department of Agronomy, ShQ.C., Islamic Azad University, Shahr-e Qods, Iran
3 - Department of Agronomy. Shahr-e-Qods Branch. Islamic Azad University, Tehran, Iran
4 - استادیار گروه زراعت، واحد شهر قدس، دانشگاه آزاد اسلامی، تهران، ایران
5 - Department of Agronomy, ShQ.C., Islami Azad University ,Shahr-e Qods, Iran
Keywords: Antioxidant, Humic acid, Magnesium Nanooxide, Organic Fertilizer, Stevia,
Abstract :
In order to study the effect of humic acid and magnesium nanoparticles on the physiological characteristics and yield of the medicinal plant, Stevia, an experiment was conducted in a field located in Safadasht region in 2021 and 2022. This research was carried out as a factorial design in a randomized complete block design with three replications. The first factor included foliar application with different concentrations of humic acid (zero (control), 1 and 2 g.L-1) and the second factor included foliar application with different concentrations of magnesium nanooxide (zero or control, 0.1 and 0.2 g.L-1). The results of the variance analysis of traits showed that the amounts of the anthocyanins, the activity of catalase, peroxidase and superoxide dismutase enzymes, soluble sugars, carotenoids, flavonoids and leaf yield increased significantly under the influence of foliar application with humic acid and magnesium nanoparticles, while the values of the saturated water deficit, malondialdehyde, membrane permeability and hydrogen peroxide decreased significantly under the influence of the application of this element and the organic composition of humic acid. The final results showed that foliar application of stevia plants with a concentration of 2 g.l-1 of humic acid and a concentration of 0.2 g.l-1 of magnesium nanoparticles, through the improvement of physiological and biochemical traits, resulted in the highest leaf yield of stevia plants.