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Three non-food cultivars of winter wheat (Biscay, Clarus, Rapsodia) were grown at four locations in the Czech Re public with different agro-ecological conditions in the years 2005–2008 and two levels of nitrogen fertilization – 90 and 120 kg N/ha were used. The influence of growing conditions (year, location, cultivation technology) on grain yield, starch content, protein, gluten, share of amylose in starch, falling number and amylographic characteristics. All qualitative indicators were significantly affected by the weather. Wheat grown in the areas 500 m a.s.l. had lower grain yield of 2.8 t/ha (8.4 t/ha), higher starch content of 2.1% (69.0%) and lower content of proteins by 1.8% (10.2%) in grain than wheat grown in the fertile conditions (below 300 m a.s.l.). The cv. Biscay had the highest starch content of 68%; the proportion of amylose in the starch was in the range 22–27%. The content of proteins was negatively correlated with starch content (r = –0.89). The level of damage of starch α-amylase was most affected by wet weather during ripening – falling number was 62 s, with a very low amylographic gelatinization maximum (30–155 Brabender units) and a low gelatinization temperature at the maximum (67–74°C). The respective values recorded in dry conditions were ca 300 s, AU 600 and 90°C. Most damaged starch was recorded in the cv. Clarus.

Influence of selected factors on the content and properties of starch in the grain of non-food wheat