Investigation of different sowing dates effect on quantitative and qualitative traits of rapesee cultivars in Zanjan
2007
Khiyavi, Majid | Karimi, Babak
In order to investigate effects of planting dates on cold tolerance in winter canola cultivars, an experiment was carried out during two years at Kheir Abad research station in Zanjan province. Statistical design was Split-Plot based on Randomized Complete Block Design with 4 planting dates (Sep. 11. Sep. 22, Oct. 2 and Oct. 12) in main plots and 3 cultivars (Opera, Licord and Okapi) in subplots and r replications (in the second year Modena cultivar was added to the experiment). Characteristics such as date of emergence, growth before winter season, resistance to cold, flowering date, end of flowering date, date of ripening, plant height, number of pods per main stem, number of grains per pod, lodging, grain yield and oil percentage were recorded. Third and forth dates of planting were neglected due to frost damage and no emergences. Simple and combined analysis of variance respectively with 4 and 3 cultivars were performed in the second year. According to the expected values of MS's and mean comparisons the results are as follows: Results of two years Effect of planting date was not significant on grain yield, date of ripening, plant height, number of pods per main stem and number of grains per pod but was significant on duration of vegetative and productive period, respectively at 1% and 5% level of confidence. Effect of cultivar on ,1000-kernel weight was significant at 5% level of confidence but not significant on the other characteristics. Interaction effect of planting date and cultivar was significant only on 1000 -kernel weight at 1% level of confidence. Interaction effect of planting date, year and cultivar was significant on grain yield and number of grains per pod at 1% and 5% level of confidence, respectively. Mean comparison of interaction between planting date and cultivar showed that the studied cultivars are classified in different statistical groups according to grain yield, duration of vegetative period and , 1000-kernel weight. Totally, Licord and Opera cultivars in planting date of Sep. 22' had the highest and lowest yield by 3256 and 2901 kg/ha, respectively. Okapi cultivar had the highest grain yield among the cultivars by the mean of 3148 kg/ha. In addition, results showed that cultivars Okapi and Licord are superior cultivars, respectively for early and late planting while both were classified in the same statistical group. Results of the second year Effect of planting date was significant on vegetative period at 5% level of confidence but not significant on the other characteristics. Effect of cultivar was significant on grain yield at 1%level and significant at 5%level on vegetative period, date of ripening, plant height, 1000-kernel weight and oil percentage. Interaction effect of planting date and cultivar was significant on plant height and oil percentage at 5% level of confidence but not significant on the other characteristics. Mean comparison of interaction between planting date and cultivar indicated that all the studied cultivars were classified in different statistical groups according to the studied characteristics except for the number of grains per pod. Totally, Modena cultivar by the mean of 4560 kglha had the highest yield for Sep 11 planting date and Okapi had the lowest yield by the average of 3566 kglha for Sep. 22 planting date. Finally, Modena cultivar had the best yield amongst all the cultivars. Therefore, it is recommended in the future Modena cultivar be studied more as a new cultivar for cold regions due to high yield for all the planting dates.
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