Investigation of the correlation relations and path coefficient analysis between yield and yield components in Canola (Brassica napus L.)

In order to investigate the correlation among traits and cause and effect relations in Canola, an experimental in agronomic year of 2012 in Zanjan province on 24 internal and external with completely randomized block design was conducted. This experiment was repeated three times. In the statistical analysis of the design 9 important traits were studied and analyzed. The results of variance analysis demonstrated that there were meaningful differences among the varieties of the traits from the statistical point of view. The correlation coefficients showed that the relation between plant height and grain yield trait was positive and meaningful and also the relation between number of pods per plant and traits including number of seeds per pod and one 1000 seed weight was positive and meaningless. According to this analysis the plant height was the most effective trait with straight effect on grain yield (0.637) and number of days to ripening was following that (0.382). Indirect effect of plant height via days to ripening was greater than indirect effect of days to ripening through plant height. So the most important traits as selection criteria to improve seed yield were determined as plant height and days to ripening.