258: Tom Shellhammer of Oregon State Shares Research on Hop Terroir

258: Tom Shellhammer of Oregon State Shares Research on Hop Terroir

Tom Shellhammer’s research work in the brewing field has been crucial for helping brewers, as well as barley and hop growers, gain deeper understanding of brewing ingredients and how they actually work. As a food science professor at Oregon State University, he’s led critical studies, including a well-known study on hop creep. His latest project is a wide-ranging, multi-year study to understand the impact of terroir on hops, and the results of the first year of the study have just been released. In this episode, Shellhammer discusses the study—what they studied, how they studied it, what the results show, and what we have yet to understand.

Along the way, Shellhammer discusses:

  • what hop terroir is (weather, soil, latitude), and what it isn’t (geomorphology)
  • the impact of farming management practices
  • the goals and parameters of the project
  • measuring compounds, but also expression through sensory, to understand terroir impact
  • how hop growers measure maturity on the bine
  • the logic behind the focus on cascade and mosaic varieties
  • the compounds at play, including monoterpene alcohols and thiols
  • clustering of groups of flavor and aroma compounds based on location
  • how the chemical compound analysis translates into finished beer
  • magnitude of the differences in terroir and the potential for impact
  • impact of microbiome in soil
  • the scale of difference in the qualitative and measured factors in the study

And more.

One takeaway? Leaning on hop variety alone is a not a perfect measure. As Shellhammer said, “The variation between these two regions was as large as the variation between the two hop varieties.”

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Jaksot(472)

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