Alpha acids content in Czech hops from the 2023 harvest – forecasts, reality and trends

Karel Krofta, A. Mikyška, Gabriela Fritschová, František Kroupa, Jana Tichá
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Abstract

The most important weather factor for the hop growing season in 2023 was the rainy period in the last decade of July and the first decade of August, which replaced the previously warm and dry weather. Heavy rainfall with a total of 60–100 mm of water and temperatures in the range of 20–25 °C saved the annual hop harvest from the yield decline that occurred in 2022. However, the above-average harvest of nearly 7000 tonnes and a yield of 1.44 t/ha was achieved at the expense of the bitter compound content of most varieties. The alpha acid content of Saaz hops was well below 3.0% w/w in all hop-growing regions, one of the lowest levels for the last 10 years. It is even lower than the extremely hot and dry year 2022 and comparable to 2015. Lower levels of alpha acids were also found in Sládek (4.8–6.7% w/w), Premiant (6.9–7.9% w/w) and Saaz Special (4.3% w/w). The varieties Agnus, Rubín and Vital contained stable amounts of alpha acids in the range of 11–13% w/w, which is about the same as in previous years. The total production of alpha acids in Czech hops from the 2023 harvest was 253 tons, which is average in a longerterm comparison. Saaz hops accounted for only 55% of the total production, although they are grown on 83.3% of the harvest area.
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2023年收获的捷克啤酒花中的α-酸含量--预测、现实和趋势
2023年酒花生长季节最重要的天气因素是7月下旬 和8月上旬的雨季,它取代了之前温暖干燥的天气。总降水量达60-100毫米的大雨和20-25 °C的气温使酒花的年度收成避免了2022年出现的减产。然而,高于平均水平的近7000吨的收成和1.44吨/公顷的产量是以大多数品种的苦味化合物含量为代价实现的。在所有酒花种植区,萨斯(Saaz)酒花的α-酸含量都远低于3.0% w/w,是过去10年中的最低水平之一。这一含量甚至低于极端炎热干燥的2022年,与2015年相当。斯拉代克(Sládek)(4.8-6.7% w/w)、普米安特(Premiant)(6.9-7.9% w/w)和萨兹特级(Saaz Special)(4.3% w/w)的α-酸含量也较低。Agnus、Rubín 和 Vital 三个品种的α-酸含量稳定在 11-13% w/w,与往年基本持平。2023年收获的捷克酒花中α-酸的总产量为253吨,这在长期比较中处于平均水平。萨斯(Saaz)酒花只占总产量的55%,尽管其种植面积占收获面积的83.3%。
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