Authors : A.M. Daneshian , A.R. Ahmadzadeh , H.A. Shahriar and A.R. Khanizadeh
Abstract: The present study was carried out to investigate the influence of sowing date on grain and biological yield, oil and meal protein percentage of three cultivars of oilseed rape (Brassica napus L.) Serez, ACSN2 and SLMO46. The experiment was done in experimental farm of Islamic Azad university of Shabestar, East Azerbaijan, Iran. The experiment was split plot. Four sowing dates (21 September, 2, 12, 22 October) were applied as main factors and three cultivars were used as sub factors based on randomized complete block design in 4 replicates. Grain and biological yield in term of gram per square meter, harvest index ,oil and meal protein percentage of grain, number of days until to emerging and the number of days till 50% flowering of the examining treatments were determined and were analyzed. The results made it clear that planting date has significant effect on all treats (p<0.01), except the number of days for 50% flowering. The examined cultivars also show a significance effect (p<0.01) except in the treat of number of days till 50% flowering which is not significant (p<0.01) and this very different rates of significance shows a lot of genetic variety among them. While studying the interaction, it was observed that the two treats of grain and biological yield were significant (p<0.05) and the examined cultivars, they didn`t indicate similar trend in different planting dates, however, the treats of oil percentage of grain, the percentage of meal protein and harvest index in different cultivars didn`t indicate interaction which planting date. The treat of number of days till flowering is significant (p<0.01) and treat of number of days till 50% of flowering is not significant (p<0.01) and indicates the interaction between planting date and the cultivars in these treats.
A.M. Daneshian , A.R. Ahmadzadeh , H.A. Shahriar and A.R. Khanizadeh , 2008. Effect of Sowing Dates on Grain and Biological Yield, Oil and Meal Protein Percentage in Three Cultivars of Rape (Brassica napus L.). Research Journal of Biological Sciences, 3: 729-732.