CULT: growing degree days
- Subject: CULT: growing degree days
- From: L* M* <l*@lock-net.com>
- Date: Tue, 02 Sep 2008 10:58:58 -0400
- List-archive: <http://www.hort.net/lists/iris/> (Web Archive)
I wonder if growing degree days used by the Climate Prediction Center might be useful to look at for sorting out temperature growth responses in iris. Not that corn is anything like iris...
Chuck, you mentioned that iris stop growing at 102oF - I wonder if that is true for all species or if some stop "appreciable" growth at lower temperatures?
<A corn growing degree day (GDD) is an index used to express crop maturity. The index is computed by subtracting a base temperature of 500F from the average of the maximum and minimum temperatures for the day. Minimum temperatures less than 500F are set to 50, and maximum temperatures greater than 860F are set to 86. These substitutions indicate that no appreciable growth is detected with temperatures lower than 50 or greater than 86.>
-- Linda Mann east Tennessee USA zone 7/8 East Tennessee Iris Society <http://www.DiscoverET.org/etis> Region 7, Kentucky-Tennessee <http://www.aisregion7.org> American Iris Society web site <http://www.irises.org> talk archives: <http://www.hort.net/lists/iris-talk/> photos archives: <http://www.hort.net/lists/iris-photos/> online R&I <http://www.irisregister.com> --------------------------------------------------------------------- To sign-off this list, send email to majordomo@hort.net with the message text UNSUBSCRIBE IRIS
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