Response of oil yield and quality of three varieties of rapeseed (brassica napus L.)‎ to NPK fertilizer

Abstract EN

Rapeseed oil is considered as one of the high quality plant oils used in human food, industry and medicine, this study was carried out under the rain-fed conditions at Qlyasan research station located 2 Km North West of Sulaimani Governorate/ Iraqi Kurdistan Region during the winter season of 2016-2017, to study the effect of three varieties, namely (Serw, Hybrid and Reandy), NPK levels (0, 150, and 300 Kg ha-1), and their interactions on oil yield, fatty acid compositions and some phenolic acid contents.

Using Randomized Complete Block Design (RCBD) with split plot arrangement, with three replications, the main plots were allocated for the NPK levels and conducted in Randomized Complete Block Design (RCBD) with three replications, while the varieties implemented in sub-plots.

Comparisons between means were carried out by the least significant difference (L.

S.

D) at 0.05 and 0.01 levels of significance.

The results of this investigation confirm that, the application of 300 kg NPK fertilizer ha-1 gave the maximum value of oil yield and all fatty acids composition (Stearic acid, Linolenic acid, Linoleic acid, Oleic acid, and p-hydroxybenzoic acid) with the exception of caffeic acid and Ellagic acid were recorded 1558.312 kg ha-1, 0.454% , 0.330% , 31.722 % , 47.609% and 0.535% respectively, while the non-fertilizer application of NPK ended up with the highest caffeic acid.

Reandy variety produced the best values for oil yield and some fatty acids composition (steairc acid and caffeic acid) % while Serw variety predominated in other fatty acids (oleic, linoleic, and linolenic Rapeseed oil is considered as one of the high quality plant oils used in human food, industry and medicine, this study was carried out under the rain-fed conditions at Qlyasan research station located 2 Km North West of Sulaimani Governorate/ Iraqi Kurdistan Region during the winter season of 2016-2017, to study the effect of three varieties, namely (Serw, Hybrid and Reandy), NPK levels (0, 150, and 300 Kg ha-1), and their interactions on oil yield, fatty acid compositions and some phenolic acid contents.

Using Randomized Complete Block Design (RCBD) with split plot arrangement, with three replications, the main plots were allocated for the NPK levels and conducted in Randomized Complete Block Design (RCBD) with three replications, while the varieties implemented in sub-plots.

Comparisons between means were carried out by the least significant difference (L.

S.

D) at 0.05 and 0.01 levels of significance.

The results of this investigation confirm that, the application of 300 kg NPK fertilizer ha-1 gave the maximum value of oil yield and all fatty acids composition (Stearic acid, Linolenic acid, Linoleic acid, Oleic acid, and p-hydroxybenzoic acid) with the exception of caffeic acid and Ellagic acid were recorded 1558.312 kg ha-1, 0.454% , 0.330% , 31.722 % , 47.609% and 0.535% respectively, while the non-fertilizer application of NPK ended up with the highest caffeic acid.

Reandy variety produced the best values for oil yield and some fatty acids composition (steairc acid and caffeic acid) % while Serw variety predominated in other fatty acids (oleic, linoleic, and linolenic acids)