Comparison of productivity and qualitative parameters of selected hop cultivars
1999
Zak, S. | Zakova, M.
In the year of 1988 a variety experiment was established in the hop-field PD Ostrov pri Piestanoch wherein 6 varieties of hop from the group of `Zatec semi-early red-bine hop' (K-72, K-114, Lucan, Zlatan, Aromat and Sirem) and 2 hybrid varieties (K-70 and K-71) were sown. The task was concentrated on evaluation of the selected hop varieties. Their productivity was tested in a field trial and with chemical analyses. Apart from dry hop yield (t/ha) we also evaluated quality characters content of alpha-acids (g in 100 g of dry matter), content of beta acids (g in 100 g of dry matter) and total content of resins (g in 100 g of dry matter), divided to soft resins (g in 100 g of dry matter) and hard resins (g in 100 g of dry matter). We found statistically significantly higher values in hybrid varieties in comparison with hop varieties from the group of `Zatec semi-early red-bine hop' in all tested characters. In dry hop yield, the values in `Zatec semi-early red-bine hop' varieties varied from 1.046 t/ha (K-114) to 1.124 t/ha (Sirem). The value of total resins varied from 11.932 (Lucan) to 12.423 (Sirem) in Zatec semi-early red-bine hop' varieties, the content of soft resins varied from 9.888 (K-72) to 10.347 (Sirem) and the content of beta acids from 6.928 (Lucan) to 7.165 (Zlatan). In the group of `Zatec semi-early red-bine hop' varieties differences were only found in the content of alpha acids, among K-72 varieties where the content of acids was the lowest (2.858) and Sirem variety (3.266). Although the difference was not significant, the Sirem variety reached the highest values also in other tested characters. We did not find any statistically significant differences among the hybrid varieties in dry hop yields in the years evaluated. A difference appeared only in hop quality in characters: content of alpha and beta acids
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