Fatty Acid Profile of Second-Crop Soybeans

Soybean is one of the oilseed plants, among the most important products with high nutritional and economic value. The present research was realized by using 5 soybean varieties (Arısoy, Ataem, Derby, Safir, S-312) that were sown 2 different dates (1st – 15th July) as a second crop for 2 years (2017-2018) with 3 replications. Following ranges of fatty acid values were determined; palmitic (10.42-11.20%), stearic (4.55-5.08%), oleic* (23.62-25.16%), linoleic (51.87-53.36%), linolenic* (5.62-6.25%), arachidic* (0.77-0.96%), total* (99.22-99.66%), SFA (15.94-16.81%), MFA* (23.63-25.17%), PFA (52.68-54.22%), total UFA (77.51-78.26%), w-6/w-3* (8.41-9.05%) while changes in the fatty acids were statistically significant that were affected by sowing time (linolenic and w-6/w-3), variety (arachidic, total) and interactive (oleic, arachidic, MFA) effects. It was concluded that Arısoy and Ataem varieties can be used in breeding studies focusing on oil quality while late sowing caused to decrease in total UFA. As a result, it was concluded that the fatty acid composition quality could be changed depending on the sowing time for oil quality. In addition, it was revealed that ecology, planting time, and cultivar had significant effects on fatty acid composition. The lipid profile in soybeans can be evaluated to improve human health with appropriate variety selection and sowing time. Furthermore, these varieties which can be grown successfully as a second crop, show a wide variation in fatty acid quality and can be used in breeding studies.