-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 15 Dec 2020 09:25:48 -0800 (PST) Ton vanN <tonv...@gmail.com> wrote:
> You open can of worms, because [there are] a large amount of > variations of Growing Degree Days related to different animals, > insects and plants. See: o University of California, Agriculture and Natural Resources. "Research Models: Insects, Mites, Diseases, Plants, and Beneficials." 2014. 15 Apr. 2018 <http://ipm.ucanr.edu/MODELS/index.html>. o Coop, Len. "Library of Degree-Day Models for Insects and Plants." 11 Feb. 2007. Integrated Plant Protection Center, Oregon State U. 1 Nov. 2020 <http://uspest.org/wea/wealib.html.> The models for insect development are very similar but have different threshold and cutoff temperatures and use different cutoff techniques. Models developed in one part of the world may not be immediately applicable to other parts. Many insect species apparently have local strains that are adapted to local conditions. The models are robust enough to be useful without exactly matching local conditions, and differences between modeling techniques are minor. There are all kinds of weather-related mathematical models with agribusiness applications beyond just weather prediction. Recently, I stumbled upon one that models the growth of pollen tubes in apples dependent upon temperature. The idea is that you can burn off the flowers by spraying lime sulfur. The trick is to do this after the pollen tubes for the king fruit have reached their ovaries and to keep doing it often enough to keep new pollen tubes from reaching theirs. This favors the earliest flowers while thinning the rest of the crop in (hopefully) an organically acceptable way. There are attendant risks. Early pollination may not be as reliable as you suppose or as you hope. Different varieties of apples have different pollen-tube lengths, and the germ plasm traverses them at different rates, so you may not be using an appropriate model if you have a different pollinator or an odd-ball variety of apple or even a variant of a well tested variety. I guess the gee-whiz factor makes up for the uncertainties of the technology. - -- .. Be Seeing You, .. Chuck Rhode, Sheboygan, WI, USA .. Weather: http://LacusVeris.com/WX .. 30° — Wind N 3 mph — Sky overcast. -----BEGIN PGP SIGNATURE----- iF0EARECAB0WIQT+MY/5I/LMPSswTbVg2/xipKOWUgUCX9l8XwAKCRBg2/xipKOW UgvzAJ4nE9JmF89LohMhcmDJ9Y+eu2DbVgCfZnpV0byyhhQVdbIJr5Gf9ySgkk8= =fJJ8 -----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/20201215211751.4a3e6639%40wealthy.
