The “Alpha Clause” for European aroma hops
The “alpha clause”, drafted in 2003 by German breweries and hop suppliers, went into effect for the first time since its inception for the 2006 hop harvest. The mean alpha acid content of almost all aroma varieties from the 2006 harvest was more than 15 % below the ten-year average. This article discusses the function of this clause on the basis of the experience gained from the last hop harvest.
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