عنوان مقاله [English]
Effects of different densities and planting patterns on yield and yield components of three canola cultivars were studied in 2008. The experiment was a split – plot based on randomized complete block design with three cultivars (Licord, Talayeh and Modena) as the main plots and plant densities on rows (5, 12.5 and 20 cm) and sowing patterns (rectangular and zigzag forms) with a factorial arrangement as subplots. Traits were evaluated included developmental stages, silique numbers in plant, silique numbers per unit area, number of silique in branches, number of branches per plant, grain numbers in silique, 1000 grain weight, grain yield, harvest index, oil percentage and oil yield. The results showed that the growth and development of rapeseed were less affected by density and sowing pattern in almost all treatments but every step occurrence in three cultivars tested were different. All parameters studied were affected by cultivar. Effect of plant density on the numbers of silique in plant, silique numbers per unit area, number of branches per plant, seeds per silique, 1000 seed weight, grain yield, harvest index and oil yield was significant. Effect of sowing pattern was also significant on the numbers of silique per unit area, silique numbers per branch, number of seeds per silique, grain yield. harvest index and oil yield. Interaction effects of cultivar, planting density and pattern for all traits were significant. Regarding to the effect of cultivar on yield and oil percent age, Licord and Modena, regarding to the effect of density on yield, plant distance of 5 cm on rows, regarding to the effects of sowing pattern on yield and oil percentage, planting zigzag and in interaction effects of cultivar, density and planting pattern on yield and oil percentage, (Talayeh cultivar, the plant distance of 20 cm on rows, planting pattern of zigzag, and Modena cultivar, 20 cm plant distances on rows and a rectangular planting pattern treatments were cosidered as superior, respectively. Regarding to the goal of present research, oil production, treatment of Talayeh cultivar, 20 cm plant space in rows and zigzag form plant pattern production oil (1571.85 kg. ha-1) can be recommend for production canola in this experiment Similar climative condition.
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