Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Yakup Onur KOCA, Aslı YORULMAZ, Osman EREKUL

The study investigates the influence of extra potassium application and deficit irrigation on fatty acid composition ofcorn oils. The field experiment was conducted with split plot design with three replications in Aydın location of Turkeyin 2013. 31G98, 31D24 and NK-Arma corn varieties were grown with three different supplies as non-fertilization,standard fertilization [210 kg.ha-1 pure N, 60 kg.ha-1 pure P, 60 kg.ha-1 pure K 60 kg.ha-1 (NH4NO3, P2O5 and K2O with15-15-15 composite before planting and H2NCONH2 – 150 kg.ha-1 with urea before first water)] and extra potassium(standard fertilization +60 kg.ha-1 K2SO4) and three irrigation doses (500 mm, 400 mm and 300 mm) duringdevelopment stages [(8 leaf stage (V8), before Tasselling (VT), after blister, milk stage and dough stage)]. Corn oilsamples were obtained from corn seeds by soxhelet extraction using n-hexane and assessed for their fatty acidcomposition with a gas chromatograph. The data obtained from studies has shown that extra potassium application anddeficit irrigation have significantly effected to fatty acid rates of corn oil of all varieties. Main fatty acids were linoleic,oleic and palmitic and ranged between 52.56-63.60%, 20.56-28.06%, 9.32-14.01% respectively. Besidesheptadecanoic, linolenic, arachidic, stearic and eicosenoic acids were determined in small amounts. Extra potassiumapplication increased linoleic (18:2), linolenic (18:3) and eicosenoic (20:1) but decreased palmitic (16:0),heptadecanoic (17:0), stearic (18:0) and oleic (18:1) fatty acid ratios. Deficit irrigation increased palmitic, linoleic andeicosenoic fatty acids, but decreased stearic, oleic, linolenic and arachidic acids.

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