Investigation of the Possibility of Winter Planting of Spring Oilseed Rape Cultivars in Cold-Temperate Karaj Region under Terminal Water Deficit Stress Conditions

Authors

1 Department of Agronomy, Science and Research Branch, Islamic Azad University, Tehran, Iran.

2 Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.

Abstract

To provide some of the required edible oil and seed meal and to stability of cereal production, it is necessary to determine suitable varieties of rapeseed in a new position of cultivation and under water deficit conditions for Iran. For this purpose, an experiment was carried out in a factorial split-plot arrangement based on RCBD with three replications during 2014-2016 growing seasons at the Research Farm of Seed and Plant Improvement Institute, Karaj, Iran. Planting dates including autumn (7 October) and winter (4 February), and irrigation regimes including full irrigation (control), and withholding irrigation from flowering and silique formation stages, were used as main factors. Spring oilseed rape cultivars (Sarigol, Delgan, Jacomo, Jeromeh and Hyola 401) were employed as sub-factor. The results demonstrated that the interaction effects of planting date × irrigation × cultivar on silique in plant, grain in silique, seed yield, harvest index (HI), oil yield and water use efficiency (WUE) were significant at 1% level probability. Regarding the highest WUE obtained from cultivars Delgan, Hyola 401 and Jeromeh (0.953, 0.887 and 0.831 kgm-3, respectively) and grain yield more than 3000 kgha-1, these cultivars demonstrated significant potentials for a new winter planting date, under full irrigation conditions. Furthermore, the cultivars Hyola 401 and Jeromeh with WUE quantities 0.930 and 0.873 kgm-3, respectively, and grain yield more than 2000 kgha-1, demonstrated significant potentials under terminal water stress (withholding irrigation from silique formation stage) at winter planting date.

Keywords

References

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Seed and Plant Production Journal
Volume 34, Issue 1
June 2018
Pages 23-38

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