Kvasny Prum. 1981; 27(7): 150-156 | DOI: 10.18832/kp1981026

Trend of the grain quality of the spring barley varieties.Peer-reviewed article

Z. VOŇKA, M. HLAVÁČ, M. HLAVINKOVÁ

Statistical evaluation of the varietal trials in the years 1958-1978 proved a significant breeding gain not only from the standpoint of yield potential of the new varieties, but also from the standpoint of quality. On the basis of the linear trends, the yield of the first two size-fraction grain and the values for modification improved most markedly; extract yield increased, too. Even though the rate of N-fertilization increased in the subsequent years, the trend of protein content remained favourable. Even though the rate of diastatic power was high, its changes were relatively rare. It was possible to classify the individual characteristics according to differences in variability. The lowest variability was characteristic for many of the extract components; on the other hand the diastatic power showed the greatest variations. The variability ranges for each of the characteristics varietally were varietally specific. The significant relationships suggest that the short-stalk-varieties with higher protein content in some years will show higher amylolitic activity, but lower extract content. The higher values of modification are a prerequisite of a higher final attenuation. The wider use of short-stalk-varieties accompanied by increased agrofon led to a higher quality compared to the quality decrease of the long-stalk-varieties; this positive trend of the malting value continues. These facts show the necessity of closely linking both agricultural and brewing properties in the new promising varieties.
(In Czech, English summary only)

Keywords: barley, grain, quality, variety

Published: July 1, 1981