Document Type : Research Paper
Authors
1 PHD student of Shahid Beheshti University
2 Associate Professors in the Department of Agroecology, Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran, Iran.
3 Professors in Oil Seed Research Department, Seed and Plant Improvement Institute, Karaj, Iran
4 Assistant Prof. Seed and Plant Improvement Institute
Abstract
To investigate oilseed rape cultivars under Late-season drought stress, a split-plot experiment was conducted in a complete randomized blocks design with four replications for two cultivation years (2017–2019) in Karaj agricultural research station. Treatments included three drought stress (full irrigation, withholding irrigation from the pod formation stage, and flowering stage) in main plots and five oilseed rape cultivars (Sarigol, RGS003, Hayola 401, Zafar, and Dalgan) in sub-plots. The results revealed that drought stress, especially from withholding irrigation from the flowering stage led to a significant decrease in 1000-seed weight, number of silique per plant, number of seeds per silique, seed yield, oil percentage, oil yield, Length of the growing duration, water use efficiency. Under full irrigation, The highest seed yield were obtained from Dalgan, Zafar, RGS003 and, Hayola 401 cultivars with 3959, 3886, 3776 and, 3650 kg. ha-1, respectively. In withholding irrigation from the silique formation stage, RGS003, Dalgan, and, Hayola 401 cultivars were superior with seed yield of 2841, 2812, and, 2716 kg.ha-1, respectively. Dalgan, RGS003, and Hayola 401 cultivars with the seed yield of 2357, 2276, and 2185 kg.ha-1in withholding irrigation from the flowering stage, also can be recommended as suitable cultivars in Karaj.
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