Influence of nitrogen level and water scarcity during seed filling period on seed yield and fatty acid compositions of corn
2015
Koca, Y.O., | Canavar, O. | Yorulmaz, A. | Erekul, O.
The study investigated the effect of different nitrogen and irrigation levels during seed filling on per cob yield, grain quality and fatty acid composition of corn oil using two corn hybrids (31G98 and Kermes cv.). The experiment was conducted in Turkey in 2011 and 2012, and was arranged following the split-plot design in RCBD with water levels (W) as main plot and nitrogen (N) levels as subplot. The four water levels were 300 mm (W1), 400 mm (W2), 500 mm (W3) and 600 mm (W4), while the five nitrogen levels were 0 (N1), 80 (N2), 160 (N3), 240 (N4) and 320 (N5) kg/ha. The results indicated that different N levels and water scarcity (W) affected cob yield, protein, oil yield and fatty acid compositions of both corn cultivars. Per cob yield, protein and oil yield increased with N levels until N4 in both years. The highest cob, protein and oil yield were recorded from N4 and W3 in both corn cultivars. N x W interaction also affected all fatty acid components such as palmitic, stearic, oleic, linoleic and arachidic fatty acids in corn oil. However changing climate such as extreme temperatures and rain during the growth period also caused irregular changes in fatty acid compositions of corn oil. Additionally, Oleic and Linoleic were found to be the dominant fatty acids of the corn oil in all treatments. The results of this study suggest that the combination of N4 and W3 level is the most viable option for optimum cob yield, protein and oil yield.
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