-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 You mentioned Chill Hours. This keeps coming up, and I've wondered whether I ought to try to tackle it, but it's not a hot-button issue for me. I'm aware that most apple varieties require differing amounts of "chill hours" to bloom. However, the consideration of chill hours available in any given location is usually moot once an orchard is planted. I suppose it's possible that chill hours must be calculated annually for other kinds of crops. Also, people are sensitive to supposed climate shifts nowadays. They want to verify government figures for chill hours, so desire to do these calculations has some currency.
There are other types of calculations similar to chill hours and growing degree-days. Have you looked into Pollen Tube Growth Models? o http://weather.wsu.edu/PollenModel/PollenTubeModel.pdf The *.pdf file has an internal date of 18 Mar 2014. It's impossible to tell from the presentation foils whether this remains an active locus of research, but I thought it was an intriguing idea. You count open apple blossoms, and, when you have enough for a good crop, you wait until the pollen tubes from the first blooms have had enough growing degree-days to reach the ovules. Then you repeatedly nuke all the blooms chemically to be sure there isn't any excessive fruit set. - -- .. Be Seeing You, .. Chuck Rhode, Sheboygan, WI, USA .. Weather: http://LacusVeris.com/WX .. 2° — Wind WNW 20 mph -----BEGIN PGP SIGNATURE----- iFwEARECAB0WIQT+MY/5I/LMPSswTbVg2/xipKOWUgUCYhD3aAAKCRBg2/xipKOW UmX2AJiyfDT4F8fqfuqoG5NecImhwn7ZAJ9LyPZ1EOr3wBnXyaIr9UuJWr/3xw== =e8a5 -----END PGP SIGNATURE----- -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/20220219075800.608dc1d1%40wealthy.
