Improvement and breeding
M. Rahghoshahi; Kh. Panahi Kord Laghari; M.M. Rahimi
Abstract
Cumin (Cuminum cyminum L.) is one of the valuable medicinal plants cultivated in arid and semi-arid regions of Iran, facing to drought stress. Accordingly, an experiment was conducted to investigate the effects of algae extract and humic acid on cumin under drought stress conditions as a factorial split ...
Read More
Cumin (Cuminum cyminum L.) is one of the valuable medicinal plants cultivated in arid and semi-arid regions of Iran, facing to drought stress. Accordingly, an experiment was conducted to investigate the effects of algae extract and humic acid on cumin under drought stress conditions as a factorial split plot in a randomized complete blocks design with three replications in a farm located in Boyer-Ahmad city, 35 km from Yasouj, Kohgiluyeh and Boyer-Ahmad province in 2019 and 2020 years. The experimental factors included drought stress as the main factor at three levels of irrigation after consumption of 35 (control), 70, and 90% of soil moisture and humic acid at two levels of 0 and 300 mg.L-1 and algae at two levels of 0 and 2 L.ha-1 as the sub-factors. The results showed that foliar application of humic acid and algae extract had a significant effect on essential oil yield, number of branches, biological yield, grain yield, 1000-seed weight, number of seeds per umbrella, number of umbrellas per plant, plant height, and essential oil percentage and improved the negative effects of drought stress. The highest grain yield, 1000-grain weight, essential oil yield, and number of grains per umbrella were obtained by foliar application of humic acid and algae extract. The application of humic acid was more effective than algae extract on traits except yield and essential oil percentage which were more affected by algae extract. In general, the results showed that foliar application of humic acid and algae extract could moderate the adverse stress conditions and increase cumin yield by 41.4%.
Agriculture and horticulture
A. Hayati; M.M. Rahimi; A. Kelidari; S.M. Hosseini
Abstract
Black cumin (Nigella sativa L.) seeds are used in the traditional medicine in many countries to prevent and treat many disorders and diseases including cough, asthma, nasal congestion, headache, toothache, intestinal worms, menstrual disorders, gastrointestinal diseases, and impotence. To study the effects ...
Read More
Black cumin (Nigella sativa L.) seeds are used in the traditional medicine in many countries to prevent and treat many disorders and diseases including cough, asthma, nasal congestion, headache, toothache, intestinal worms, menstrual disorders, gastrointestinal diseases, and impotence. To study the effects of humic acid and iron nanochelate on the content of osmotic protective osmolites including glucose, fructose, sucrose, proline, superoxide dismutase, catalase, and peroxidase of medicinal plant black cumin under the drought stress conditions, an experiment was conducted as a split factorial based on the randomized complete block design with three treatments in three replications at the Agricultural and Natural Resources Research Station of Eqlid city during two crop years of 2018 and 2019. The main plot consisted of three levels of irrigation (50, 75, and 100% of available water) and sub-plots included humic acid (0, 250, and 500 mg l-1) and iron nanochelate (0, 1, and 2 g l-1). The results showed that the effects of irrigation, humic acid, and iron chelate treatments on the catalase, superoxide dismutase, glucose, and peroxidase content, irrigation treatments on the proline content, and irrigation and humic acid treatments on the sucrose and fructose content were significant. The content of all protective osmolites increased in the 50% drought stress treatment. The highest content of glucose, fructose, and sucrose was obtained in the 50% drought stress, 500 mg l-1 humic acid, and 2 g l-1 iron nanochelate treatment. Overall, based on the results of this experiment, the application of humic acid fertilizer (500 mg l-1) and iron nanochelate (2 g l-1) could be recommended to reduce the effects of drought stress on black cumin.
