Study of different levels of iron chelate and nano-iron chelate on fatty acid composition and oil percentage of rapeseed (Brassica napus) in different growth stages

In order to evaluate the effect of foliar application of iron chelate and nano-iron chelate on rapeseed oil profile (Brassica napus), a factorial experiment based on randomized complete block design with seven treatments and three replications, was conducted in 2018. Factors studied include different concentrations of iron in the form of chelate and nano-iron chelate at seven levels (distilled water (control), one, two and three grams per liter of iron chelate and one, two and three grams per liter of nano-iron chelate) and time of foliar application at two levels (vegetative stage and beginning of flowering). The results of the present study showed that the trait of oil percentage was affected by the application of iron fertilizer with different concentrations (iron chelate and nano-iron chelate) and its consumption time, except for the concentration of 1 g.L-1 iron chelate fertilizer, that the time of fertilizer application did not affect the percentage of rapeseed oil. Application of 1 g.L-1 iron chelate in the vegetative growth stage and also the beginning of flowering (delayed foliar spraying) were the superior treatment to increase the percentage of rapeseed oil, so that it increased 77 % and 75% of the oil content compared to the control treatment, respectively. According to the results of this study, in order to increase unsaturated fatty acids such as oleic acid and linoleic acid, foliar application of iron fertilizer in the form of chelate in the vegetative stage is recommended.