Influence of picking date on the Hop Storage Index

The Hop Storage Index (HSI) is one of the parameters to evaluate freshness of hops and hop pellets. Our newsletter of January 2012 already informed about the varying HSI within hop varieties and crop years.

In order to know if the picking date itself influences the initial HSI value, standardized harvesting trials were performed in cooperation with the Research Centers Hüll and Weihenstephan. Samples of 3 aroma and bitter hops from the German locations Rohrbach (Ro) and Hüll (Hu) were taken a few weeks before and after regular picking date.

Both figures compare the HSI of first (Tmin) and last picking date (Tmax) for both crop years.

Read the complete article here!