Investigate the effect of selenium application on quantity and quality of oil yield in canola cultivars under delayed planting conditions

In order to investigate the effect of selenium application on quantity and quality of oil yield in canola cultivars under delayed planting conditions, the present experiment was conducted as a factorial split plot arrangement based on randomized complete blocks design with three replications, at field research of Seed and Plant Improvement Research Institute located in Karaj, in two cropping years during 2013-14 and 2014-15. The first factor was, planting date in three levels included planting on 7 October (on time planting), 17 October and 27 October (delayed planting), the second factor selenium in two levels included non-application and application of 30 gram per liter per hectare selenium and cultivar and line, included Opera, L72, KR1 GKH3705, GKH0224 and Neptune as the third factor, in which the first and second factor was assigned as factorial in the main plots and the third factor as the split plot in the sub plots. The results of experiment indicated that the planting date and cultivar and dual interaction between planting date and cultivar, was significant on all of the studied traits. Grain yield and grain oil yield increased due to selenium application. Based on the mean comparison of interaction of the three treatments, the highest percentage of Palmitoleic acid changes due to the application of selenium, on L72 cultivar in planting date of 7 October (61.9 percent), on Opera cultivar planting date of 17 October (22.2 percent) and on GKH3705 cultivar in planting date 27 October (16.5 percent) was observed. The most increase in grain yield was observed in L72 line (5853 kilogram per hectare)and oil grain yield (2576 kilogram per hectare) in normal planting conditions, but Opera cultivar in delayed planting conditions showed the highest value of this trait. Most of the increase in grain yield was obtained due to the use of 30 gram per liter per hectare of sodium selenite, in delayed sowing conditions, in line KR1 (4/13 percent) where led to increasing yield of this cultivar from 2536 to 2876 kilogram per hectare.