Starch and bioethanol content from the winter wheat

Wheat grains contain starch that is readily recyclable into bioethanol. The study aim: to assess the starch and bioethanol outcome factors (variety, cultivation year, N fertilizers rate) influencing the growth of winter wheat. The trial with winter wheat varieties 'Flair', 'Fredis, Dlivin' was carried out in humi-podzolic gley soil. Ethanol fermentation was carried out with different parameters of the evaluation of winter wheat. The method is based on the fermentation of saccharified wheat sample by yeast Saccharomyces cerevisiae. The starch content is the most affected (p<0.05) by winter wheat cultivation year (47%), but the bioethanol outcome-by winter wheat variety (44.8%). In 2008 the bioethanol outcome was 0.3364 g g(-1) and the starch content of 676 g kg(-1) on average, but in 2009, respectively -0.3339 g g(-1) and 662 g kg(-1). In 2008 the significant negative correlation between starch content and wheat harvest on fertilizers norm N 70+30, but positive correlation of N 70+70 was found In 2009 the correlation between these parameters was positive in both N aplication bacgrounds. The correlation between starch content and bioethanol outcome differed during the years. It means that the correlation between various properties depends on genetic and environmental factors. Fertilizer norm N 70 +70 kg ha(-1) reduced the starch and bioethanol content in all varieties in 2009, but in 2008 - N fertilizer was not crucial for the content of bioethanol and starch.