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Effect of Delayed Planting on Seed Yield and Its Components of Winter Rapseed (Brassica napus L.) Cultivars Under Optimum Irrigation and Terminal Drought Stress Conditions | ||
| به زراعی نهال و بذر | ||
| Article 6, Volume 34, Issue 2, October 2018, Pages 207-232 PDF (1.69 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/sppj.2018.118945 | ||
| Authors | ||
| H. R. Khademhamzeh1; A. yadavi* 2; M. Movahhadi Dehnavi3; A. H. Shirani Rad4 | ||
| 1Faculty of Agriculture, University of Yasouj, and Faculty Member of Field and Horticultural Crops ResearchDepartment, Fars Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization, Shiraz, Iran | ||
| 2Agronomy Department, Agricultural faculty, Yasouj University, Yasouj, Iran | ||
| 3Faculty of Agricultural, University of Yasouj, Yasouj, Iran | ||
| 4Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran. | ||
| Abstract | ||
| To evaluate the effect of delayed planting and irrigation regimes on yield, yield components and some agronomic traits of winter rapeseed varieties, two separate field experiments (I: optimum irrigation and II: terminal drought) carried out as split plot arrangements in randomized complete block design with three replications in 2014-2016 cropping seasons at Zarghan field station, Agricultural and Natural Resources Research and Education Center of Fars, Iran. In each experiment three planting dates (07, 17 and 27 October) and four winter rapeseed varieties; two open pollinated cultivars (Talayeh and Okapi) and two hybrids (Neptune and Elvis)) were assigned to main plot and randomized in subplot, respectively. The results indicated significant effect of irrigation and variety on all traits.The effect of planting date was significant on all traits except 1000 seed weight and number of seed per pod. Terminal drought decreased plant height, days to maturity, seed yield and yield components. The decrease in seed yield by terminal drought and delayed planting was 23.9 and 18.4%, respectively. The reduction of 17.2% of seed no. per pod by terminal drought stress and 16.2% of pods per plant by delayed planting caused yield reduction. The results also showed that the effect of terminal drought stress on seed yield and harvest index was much higher than the delay in planting. Tallayeh which maintained seed yield superiority under different conditions can be recommended as the suitable variety for similar growing conditions. | ||
| Keywords | ||
| Rapeseed; harvest index; 1000 seed weight; open pollinated | ||
| References | ||
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