The impact of climate change on the yield and quality of Saaz hops in the Czech Republic

Možný, Martin; Tolasz, Radim; Nekovář, J.; Sparks, Tim H.; Trnka, Miroslav; Žalud, Zdeněk

doi:10.1016/j.agrformet.2009.02.006

Cited by 83 publications

(68 citation statements)

References 31 publications

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“…De Keukeleire et al (2007) noted that water stress can lead to poor condition of the plants, with a resulting reduction in alpha-acid levels, since weather conditions supposedly promote an increased biosynthesis of alpha-acids in hop plants. Zattler and Jehl (1962), Thomas (1980), Srecec et al (2008), Kucera and Krofta (2009), and Mozny et al (2009) studied the dependence of alpha-acid levels on meteorological parameters over the entire vegetative period for Market value assessment of hops by modeling of weather attributes the Aurora cultivar. However, not all of the cited assessments were entirely consistent with respect to which meteorological parameters and precisely which vegetation period of hops had the greatest impact on the alpha-acids in hops.…”

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confidence: 99%

Market value assessment of hops by modeling of weather attributes

Pavlovič¹,

Pavlovič²,

Rozman³

et al. 2013

PLANT SOIL ENVIRON

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The effect of major weather factors on the quality of hops in Slovenia from 1994 to 2009 is analyzed and discussed. For this purpose, the three main varieties, namely Savinjski golding, Aurora and Bobek were merged into a model variety which we called Virtual. Through assessment of correlation coefficients, we tried to find specific times of the year when the weather conditions affect the alpha-acid content with a view toward prediction. The most significant time periods of weather that influenced the alpha-acid contents of hops during the growing season are identified as attributes of air temperatures calculated during the interval from the 24 th to the 31 st week (T 2431 ; r = -0.92; P < 0.01), as attributes of rainfall and sunshine duration calculated during the interval from the 25 th to the 29 th week (R 2529 ; r = 0.83; P < 0.01 and S 2529 , r = -0.76; P < 0.01), and as attributes of air humidity calculated during the interval from the 28 th to the 33 rd week (RH 2833 ; r = 0.77; P < 0.01).

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confidence: 99%

Market value assessment of hops by modeling of weather attributes

Pavlovič¹,

Pavlovič²,

Rozman³

et al. 2013

PLANT SOIL ENVIRON

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“…They found that the sum of the average daily temperatures in the vegetation period was negatively correlated (r = -0.39, P < 0.05) with alpha-acid levels, while total rainfall during the same period had a positive effect (r = 0.46, P < 0.05). Kucera and Krofta (2009) and Mozny et al (2009) indicate a positive impact of rainfall and a negative effect of temperature on alpha-acid content. In addition, Kucera and Krofta (2009) found that the strongest influence on the alpha-acid content was exerted by air temperatures in July.…”

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confidence: 99%

Environment and weather influence on quality and market value of hops

Pavlovič¹,

Pavlovič²,

Čerenak³

et al. 2012

PLANT SOIL ENVIRON

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The paper analyses the influence of four main weather parameters on alpha-acid contents for the main hop variety Aurora (Super Styrian Aurora) in Slovenian production for the time period 1994-2009. Through inspection of correlation coefficients, it tries to find specific times of the year when the weather conditions affect the alpha-acid content with a view to prediction in Slovenia. The most significant time periods of weather that influenced the alpha-acid contents of the Aurora variety during the growing season are identified as attributes of temperatures calculated from the interval from 25 th to 30 th week (T 2530 , r = -0.88, P < 0.01), as attributes of rainfall and sunshine from the interval from 25 th to 29 th week (R 2529 , r = 0.85, P < 0.01 and S 2529 , r = -0.75, P < 0.01) and attributes of relative humidity from the interval from 27 th to 32 nd week (RH 2732 , r = 0.71, P < 0.01). The attribute T 2530 represents the sum of active temperatures from June 18 to July 29 of that year. Similarly, the attribute R 2529 corresponds to the rainfall (in mm or L/m 2 ) that fell during the June 18 to July 22 etc.

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“…However, the size and direction of the changes of phenological dates is spatially diverse. In many research studies, acceleration of phenological dates has been confirmed mainly in the north-western part of the Europe, but also in Central Europe, in the Black Sea region, in the Baltic Sea region and around the Carpathians (Estrella et al, 2007;Kalvāne et al, 2009;Menzel & Estrella, 2001;Mozny et al, 2009). Delay of phenological dates according to Schleip et al (2009a) has been observed in central Poland and in the Baltic Sea region.…”

Section: Discussionmentioning

confidence: 99%

“…The observed changes most often oscillate from 1 to several days per 10 years, and less frequently -about a dozen days per 10 years (Fujisawa & Kobayashi, 2010;Tao et al, 2006). Acceleration of hop flowering observed in the Czech Republic amounted to -1.6 days/10 years (Mozny et al, 2009). In Germany changes of certain phenological dates of winter rye and fruit trees amounted to -2.0 to -2.9 days/10 years (Chmielewski et al, 2004).…”

Section: Discussionmentioning

confidence: 99%