Effect of boron, zinc and sulfur elements on grain yield and fatty acid composition of rapeseed (Brassica napus L.)

In order to investigate the effects of boron، zinc and sulfur on yield and fatty acid composition of rapeseed (Hyola 401 cultivar)، an experiment was conducted in Rasht province in 2011. A field experiment with completely randomized block design was performed with eight treatments in three replications. Maximum grain yield (4157. 6 kg ha-1) and grain oil (1770. 2 kg ha-1) was obtained from S+B+Zn treatments. The highest and lowest grain oil was obtained from S+B+Zn (42. 58) and control (38. 37)، respectively. The maximum oleic acid (234. 8 mg g-1) and linolenic acid (26. 68 mg g-1) and linoleic acid (55. 98 mg g-1) were obtained from B+Zn+S treatments. Maximum stearic and palmitic acid were obtained from control and S+Zn treatments which was 6. 5 and 15. 53 mg g-1، respectively. Regarding to the results، fatty acids composition of rapeseed are influenced by nutrient and since quality of edible oils depends on unsaturated fatty acids، especially linoleic and linolenic acids and these acids are essential fatty acids for the human body that must be supplied through diet. Therefor this research showed that we are not only able to increase oil yield with can also increase oil quality with increasing fatty acid composition.