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| Dont remeber who posted this last year but though I would post it again for those who forgot about it or never knew about it. It comes in pretty handy. You will have to go to Weather Under Ground, find your local weather forcast and from there find out which station you want to use thats closest to your location. http://getchill.net/ |
Follow-Up Postings:
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| Well, according to the chilling hour calculator, we got: Below 45 Model: 486 And yet this was a very heavy crop load year for apples, to where they were breaking branches off the tree. This isn't just low-chill varieties like Anna and Dorsett Golden, but a good cross-section of high-chill such as Black Oxford, GoldRush, Enterprise, Thomson County King, Mutsu, Bramley, Wickson, and King David. |
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- Posted by bamboo_rabbit 9A Inverness FL (My Page) on Sun, Dec 29, 13 at 12:41
| Below 45 Model: 56 Between 45 and 32 Model: 48 |
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- Posted by Fascist_Nation USDA 9b, Sunset 13, (My Page) on Sun, Dec 29, 13 at 16:30
| It is actually very accurate IF the weather station you are using has complete annual data. Unfortunately, there is no code to return an error message if the data is incomplete. Generally if the Utah measurement comes back nonsensical I figure the database is incomplete and try another nearby one. In major cities not a problem, in rural areas where not too many weather stations (and ones that may not work at night or be noticed if offline for a few days....) That looks reasonable for Riverside, CA. 2012-2013 winter--which was unusually cold--Nov 1 - Mar. 1(?) data for a couple of Phoenix stations: KAZPHOEN117 |
This post was edited by Fascist_Nation on Sun, Dec 29, 13 at 16:38
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| It's been too cold in my area to get many chill hours yet. Below 45 Model: 1183 Between 45 and 32 Model: 552 Utah Model: 513 Looks like chill hours though is not going to be a problem anywhere next year! |
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| Using station KTXALPIN8 for Alpine, TX gives chill units as follows: Below 45: 539 That seems reasonable given we are a 7-800 annual below 45 zone. As usual it is too cold at night and too warm by day for effective chilling. My estimate in the greenhouse is 692 Utah hrs since Nov 22, way more than outside. I'm heating to 39F at night and taking 10-12F off daytime highs. The optimum chilling temperature is 41F according to the Utah model. See fig 4 linked below which is a graph of chill units vs temperature. They way I read that graph these are the Utah chill units per hour at various temperatures: 32F and below: 0 That's a little more chilling in the upper 40s and 50s than I was thinking. And the drop off below 41F is very steep. This doesn't seem right just because 30s and below are very chilly for people. But these numbers are based on good research to determine what is effective chilling for many fruits. |
Here is a link that might be useful: Fig 4 Utah chill units vs temperature
This post was edited by fruitnut on Sun, Dec 29, 13 at 18:13
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