Effects of Agronomic Factors on Yield, Yield Components and Oil Percent of Two Spring Canola Genotypes in Gonbad Area

In order to study the effects of agronomical factors on grain and oil yield, yield components and oil percent of two canola spring genotypes, an experiment was conducted at Agricultural Research Station of Gonbad during 2002–2004.The experiment was a factorial split plot in a RCBD with four replications. Two genotypes (Option 500 and S-3) and three seed rates (4, 6 and 8 kgha-1) were arranged in a factorial form in main plots and three row spacings (12, 24 and 36 cm) were subplots. The results of combined analysis showed that although the greater duration of growth in the first year of experiment had the greater 1000-seed weight, but it decreased the seed yield and oil of the first year of experiment rather than the second year of experiment because of producing higher plants, more lodging and lower number of pod per plant and number of grain per pod. The number of seed per pod and 1000-seed weight in S-3 genotype were significantly more than those of Option 500 genotype. Increasing of seed rate increased the number of plant per square meter, but it had not any significant effect on grain yield because of more lodging and lower number of pod per plant. In the first year of experiment (with a prone condition for lodging), the better distribution of plants resulted in decreasing of seed yield with increasing of row spacing. Finally Option 500 genotype with 4 kg seed ha-1 and 12cm row spacing had the highest seed yield and oil (3856 and 1791 kgha-1, respectively).