Jahantighi, H. (2012) Effects of drought stress and different Nitrogen levels on the quantitative and Qualitative characteristics of Black Cumin (Nigella sativa L.) in Sistan region. Masters thesis, University of Zabol.
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Abstract
Black Cumin (Nigella sativa L.) a number of the family Ranunculaceae is being used for edible and medicinal purposes in several countries of the world. To study effects of drought stress and nitrogen levels application on the quantitative and qualitative yield of this plant, an experiment was conducted at Zahak Agricultural Research station during 2010- 2011growing season. The experimental design was a split plot arrangement in RCBD with three replications. Four drought stress included; A1= normal irrigation (control), A2= stop irrigation from stem elongation to the start of flowering, A3= stop irrigation from flowering to the start of capsule formation and A4=stop irrigation in capsule formation and grain filling stages were assigned as main plots and four N levels (0, 30, 60 and 90Kg ha-1) were randomized in sub plots. Analysis of variance showed that drought stress reduced yield, yield components and Fe content grain, but increased qualitative characteristics including essential oil, Thymoquinone, oil, protein percent and grain mineral contents (N, K, P, Cu, Zn and Mn) significantly. Effect of nitrogen levels was significant on the all of quantitative and qualitative characteristics except harvest index, so that by increasing N application; plant height, branch number per plant, capsule number per plant, biological yield, grain number per plant, essential oil, oil, protein and nitrogen grain percent increased, but K, P, Zn and Mn grain content decreased. Meanwhile the most grain number per capsule, 1000- grain weight, grain yield, Thymoquinone percent and Cu grain content were attained by 60 Kg ha-1 N application whereas consumption of more fertilizer rate (90Kg ha-1) had negative effects on these important traits. Interaction effect of drought stress × nitrogen levels was significant on the grain number per plant, essential oil, Thymoquinone, oil, N, P, Cu, Zn, Fe and Mn grain content, but this effect wasn't significant for plant height, branch number per plant, capsule number per plant, grain number per capsule, grain and biological yield, harvest index, 1000- grain weight and K grain content. On the basis of these results, application of 60 Kg ha-1 N under normal irrigation and under drought stress conditions in capsule formation and grain filling stages are respectively recommended for maximum yield grain and maximum active ingredients production.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Drought stress, Nitrogen levels, Black Cumin, Yield, Active ingredients |
| Subjects: | S Agriculture > SB Plant culture |
| Depositing User: | admin admin1 admin2 |
| Date Deposited: | 26 Apr 2016 07:10 |
| Last Modified: | 26 Apr 2016 07:10 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/530 |
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