Abstract
The influence of four main weather attributes on the content of alpha-acids of the hop cv. Aurora for the period 1994–2019 was studied. By analysing correlation coefficients, specific times of the year when the weather conditions affect the alpha-acid content with the goal of creating a forecasting model in Slovenia were identified. The most significant periods of weather that impacted the alpha-acid contents throughout the growing time of year are recognised as attributes of temperatures (T), rainfall (R) and sunshine (S) calculated from the 25<sup>th</sup> to 30<sup>th</sup> week (T<sub>2530</sub>, r = –0.78, P &lt; 0.01; R<sub>2529</sub>, r = 0.72, P &lt; 0.01 and S<sub>2529</sub>, r = –0.81, P &lt; 0.01) and attributes of relative humidity (RH) from the 27<sup>th</sup> to 32<sup>nd</sup> week (RH<sub>2732</sub>, r = 0.82, P &lt; 0.01). T<sub>2530</sub> stands for the amount of active temperatures from June 18 to July 29. Likewise, R<sub>2530</sub> matches to the precipitation (in mm or L/m<sup>2</sup>) during the same time period.
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