Abstract
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&ndash;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<sup>th</sup> to 30<sup>th</sup> week (T<sub>2530</sub>, r = &ndash;0.88, P &lt; 0.01), as attributes of rainfall and sunshine from the interval from 25<sup>th</sup> to 29<sup>th</sup> week (R<sub>2529</sub>, r = 0.85, P &lt; 0.01 and S<sub>2529</sub>, r = &ndash;0.75, P &lt; 0.01) and attributes of relative humidity from the interval from 27<sup>th</sup> to 32<sup>nd</sup> week (RH<sub>2732</sub>, r = 0.71, P &lt; 0.01). The attribute T<sub>2530</sub> represents the sum of active temperatures from June 18 to July 29 of that year. Similarly, the attribute R<sub>2529</sub> corresponds to the rainfall (in mm or L/m<sup>2</sup>) that fell during the June 18 to July 22 etc. &nbsp;
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