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Post by davida on Feb 23, 2012 0:33:02 GMT -5
It's not that I dislike cornbread... It's just that around here we don't use dried corn as human food, so it's unfamiliar. I have plenty of AD seed so let me know if the early planting croaks, I'll send more. When do you normally plant corn? Usually May 5th which is about 3 weeks after our average last frost date of 13APR. We usually get some terrible spring storms in late April and early May(tornado season) with wind and hail so we have had more success (except corn) before 2011 by not pushing the season. In the past, we would have to use a little more water by waiting but get a good harvest. This year we are going to plant both early and late.
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Post by Joseph Lofthouse on Feb 23, 2012 10:55:22 GMT -5
My recommendation for planting AD is 3 weeks before average last frost date, so around 23rd March....
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Post by davida on Feb 23, 2012 13:02:55 GMT -5
My recommendation for planting AD is 3 weeks before average last frost date, so around 23rd March.... Joseph, Thanks for the information and for sharing your gardening techniques and knowledge. I like to "ponder" and you definitely give me alot to consider. We will try it early since you were so generous to offer additional seeds, if needed. I have to learn to cope with the sadness and disappointment of seeing a beautiful crop destroyed by nature. IMO, this is the major weakness of planting a hybrid variety and/or not practicing seed selection. Without seed selection, if nature or insects destroys 99% of a crop, all is lost. But with seed selection, the 1% remaining may produce the food that keeps your family alive in future years, so much is gained. David
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Post by Andre on Jul 8, 2013 8:30:35 GMT -5
I found this web site helpful. It allowed me to generate a growing degree days chart for a nearby weather station. www.degreedays.net/ I try this website for french weather stations but unfortunately datas are not reliable. If someone knows another one...
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Post by reed on Mar 8, 2015 7:25:09 GMT -5
Then we can do fun things... Like for example I can graph GDD for my farm vs Pekin Indiana the hometown of Astronomy Domine Sweet corn. If it takes 800 GDD:10C to grow the crop then with a May 5th planting date it takes me 14 weeks to accumulate that much growth while it only takes 8 weeks in Pekin. And we can do speculative what-if calculations... What if using a floating row cover raises the average temperature 1.5 degrees C? That aughta make my harvest about 135 GDD earlier in a 3 month crop, so around 2 weeks earlier. I have noticed that the sunlight reflected from the south side of trees and shrubs warms the micro-environment immediately around them and I get earlier crops there. Very, very interesting since Pekin IN is as about 60 miles from me, as the crow flies. It's farther from the river, don't know the elevation. Data may have originated at Louisville anyway. I'm posting partly just to make it easier to find this again and check out the links to the data. Never intended to get this technical about planting seeds but can't deny the usefulness of it. Turning a nice fat csv file into pretty pictures is also more fun than watching TV when the ground is covered in snow. I'll be back. So a person could, if properly dedicated or obsessed plant a bunch of varieties of something, track GDD till harvest and replace DTM with GDD totals. Then anyone could look up GDD for their location and have a much better idea of how long it would take to grow that thing.
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Post by reed on Oct 14, 2015 19:26:30 GMT -5
I had a talk with Bob from the Corn Cafe/ Kingcorn.org, he's from Purdue and corn is really his thing. He gave me this equation to help me figure out all my dents and flints, so that I could keep the silking days 7 days away from each other. GDDs to silk = (15.1 times "day" rating) minus 311.56 ex. a 120 "day" variety ~ (15.1 x 120) - 356 = 1500 GDDs to silk This whole GGD thing is very interesting. I followed the link Joseph Lofthouse gave and got info to make my own little chart. I used Louisville Ky because it is a little closer to me than Cincinnati and made a monthly average for the last six years. It, with the formula above just might help me decide when to plant. It occurred to me also to go back and download daily averages for as many years as possible. That might give an even better picture. Little out out of practice on my CSV files and charts but appears to be a little like the proverbial riding a bike. Using the formula and observation I could make a pretty good translation of DTM to GDD for each corn I grow. Don't know why except it sounds fun and maybe someone else might find it useful.
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Post by keen101 (Biolumo / Andrew B.) on Nov 16, 2015 2:03:41 GMT -5
It is really interesting isn't it? I just posted a new post on my blog about it. But having looking back at the graphs i made earlier this season it seems i was able to get a fairly accurate estimate for my growing season by using several years data and averaging it. It did take a bit of time to track down some of the data though. According to my graph number 2, i estimated the first fall frost about October 28th, thinking back i think we got one on October 27th. Pretty Good to me! We had a frost advisory on the 23rd as well, which interestingly enough corresponds the the firsts major temp dip in my graph. Not perfect but accurate for my uses! But looking even closer at my graphs it looks like i might be able to plant cool season frost-tolerant crops as early as March 11th. I have never tried planting anything that early. but...maybe i should... I've found good success with weekly data. It's more accurate than monthly data, but not as tedious as every day. Also, in reality i used about 5 or 6 years worth of data, but it made the graph cluttered, so i "smushed" the "hidden" years into the average.
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Post by richardw on Nov 16, 2015 23:52:18 GMT -5
Your 2014 growing season was all over the show compared to 2010.
How high above sea level are you Colorado as that would have a greater bearing than if comparing climates of similar latitudes
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Post by keen101 (Biolumo / Andrew B.) on Nov 17, 2015 3:25:46 GMT -5
Your 2014 growing season was all over the show compared to 2010. How high above sea level are you Colorado as that would have a greater bearing than if comparing climates of similar latitudes Yeah, I wasn't here gardening in 2014, so i wouldn't know, but the data does look weird for that year. In 2013 there were major floods. The bridge near my house that connects to the bike trail is still gone. I'm at about 5000 Feet above sea level in english units.
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Post by reed on Nov 17, 2015 5:03:23 GMT -5
It's pretty amazing how altitude changes things even in a very local area. I'm about 850 above sea level, the river valley which is maybe two miles away is 425 above. There has been a lot more frost already down there.
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Post by keen101 (Biolumo / Andrew B.) on Dec 5, 2017 14:42:14 GMT -5
Bump. i'd like to discuss this more please. This GDD stuff is interesting. Add that to the fact that Day-to-maturity is not all that accurate or helpful i think days-to-maturity should be replaced by GDD. Do you think the growers and breeders who list their varieties on OSSI could be persuaded to use GDD instead or at least add it to their pledged varieties information?? I like how Joseph Lofthouse always mentions when his varieties are "promiscuously pollinated" as a way to not provide confusing information on the so-called "open-pollinated" term which means the exact opposite of openly pollinated (i.e. highly inbred). Could the same thing be done for more accurate growing estimates with GDD? Joseph Lofthouse, can you tease us with some new GDD and climate graphs. I know you love to tinker with the graphs and pretty colors and lines. lol
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Post by walt on Dec 5, 2017 15:28:34 GMT -5
This is a very useful thread, but..... I have grown O'odham 60 Day flour corn and Gaspe Flint corn side by side on and off for years. Planted on the same day, if there is a long cool spring, the Gaspe will tassel and silk well before the O'odham. If weather turns hot just after planting, O'odham will tassel and silk well before Gaspe. Same GDD, different results. Of course, Gaspe FLint is adapted, over centuries, to cool weather of the Gspe peninsula of Quebec. O'odham is adapted to hot weather in the desert southwest USA, northwest Mexico. These are two extreme types in one way, adaption to heat or cold. Similar in listed days to maturity. When dealing with extreme types, neither GDD nor listed days to maturity mean much. Either can be a clue that can be useful, but either can mislead. Sometimes after getting as much information as you can, you have to make your best guess and live with it, knowing you may have missed out on something better. Something like getting married.
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Post by Joseph Lofthouse on Dec 5, 2017 15:40:07 GMT -5
walt: One variety that is like that for me, is Moscovich tomato. People keep telling me that it's the earliest thing ever, but when I grow it in my garden with cold, radiant-cooled nights, it is one of the last to produce fruit. I don't know what the advertised DTM is for Jagodka tomato, but in my garden, it thrives in cold weather that doesn't provide many Growing Degree Days.
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Post by walt on Dec 5, 2017 15:50:35 GMT -5
That's the beauty of landraces. They adapt, not to charts, etc., but to actual conditions. Still, charts can keep us from making even bigger mistakes.
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Post by keen101 (Biolumo / Andrew B.) on Dec 6, 2017 1:27:25 GMT -5
Cool. Great discussion. walt, i never thought about that. great point. I still would like to start seeing more GDD estimates. Like Jagodka for example, what would the GDD look like for that (assuming you actually had the data) if i wanted to grow it here and how could i convert that to "days-to-maturity" in my climate? This link was mentioned on OpenAg: ndawn.ndsu.nodak.edu/help-corn-growing-degree-days.html
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