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Old 03-30-2010, 09:00 AM   #1
fromhereon
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I couldn't find anything on this anywhere so sorry if it has already been answered. But if i were to grow my own hops how would I determine the alpha acid percentage. I assume this is something you have to find out from supplier. But would this stay the same every year. I am very interested in growing hops but if i did not know the alpha acid, How would I dertermine the bitterness of the beer, or keep it consistant.



 
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Old 03-30-2010, 01:10 PM   #2
COLObrewer
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Unless you're willing to spend a lot of money to have them tested, you won't know the exact AA, I just guess and use an average for the strain.



 
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Old 03-30-2010, 01:14 PM   #3
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There was a titration method of estimating AA for homgrown published in a late 90's Zymurgy. At the bottom of the page. I take the average for the strain and adjust by taste.

 
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Old 03-30-2010, 02:16 PM   #4
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Read this thread:

http://www.homebrewtalk.com/f92/test...erness-134065/

 
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Old 03-30-2010, 02:17 PM   #5
Randar
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There are places out there that offer testing for $30 per sample. Or, if you have access to a lab here are some procedures:

http://www.realbeer.com/hops/ASBC.html

 
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Old 03-30-2010, 04:54 PM   #6
fromhereon
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Ok thanks. But do you know if the AA of the plant will stay the same over time, or will I have to change my recipe when i harvest more hops?

Thanks again

 
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Old 03-30-2010, 05:09 PM   #7
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AA is dependent on soil nutrient, light, and water. Something only the heavens can control lest you are in a basement.

Tis' why every year the alpha changes.

 
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Old 03-30-2010, 05:17 PM   #8
COLObrewer
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AA will also vary from plant to plant, or so I was told.

 
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Old 03-30-2010, 05:19 PM   #9
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Quote:
Originally Posted by COLObrewer View Post
AA will also vary from plant to plant, or so I was told.
Yes. Definitely. As will yield and optimal harvest times.

 
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Old 03-30-2010, 05:33 PM   #10
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Yes, yes, and yes. It is guaranteed to change.

On a field of cascades we have, the alpha from year 1 to 3 went from low 4% up to almost 6%.

How you dry and store them will effect it. How long its stored will also. Don't sweat the details too much. just estimate, use and adjust for the next time.



 
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