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| A lotta guys claim corn all needs to come up in three days? I had good planting conditions. But have some plants just coming up late? I don't know if its week germ? It was in moisture with no hard rain on it ? |
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Illinois | Yup a herbicide resistant weed |
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Mid-Michigan | I don't know about the three day thing but I believe even emergence is important. I plant at least 2 inches and I don't think much of my corn is ever up in 3 days. |
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| If it produces a ear I wouldn't call it a weed. Time will tell. |
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Morris, IL | Well with last years cold wet spell early we raised 250-275 bushel on bunch of weeds. Not what I want but I think some have listened to Greg Sauder a bit too much. |
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Roanoke, IN | Within 3 days of neighbors, not within 3 days of planting. |
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Roanoke, IN | Flag a couple of the late emergers and check back up on them throughout the season. |
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Nebraska | Yes, it will likely not get an ear emerging a week later than its neighbors. Put a flag by it an watch it this year so that you can learn and you'll be the one answering the question instead of asking it.
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Mid-Michigan | Orfarmer - 5/16/2018 07:40
Within 3 days of neighbors, not within 3 days of planting.
I misunderstood. |
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NCIN | Agree. Can't raise corn without 30 seconds variance in emergence, picket row stand, and $300K of equipment and technology. :>) |
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| what kind of planter did you use. |
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Northern Nebraska | It would depend on how many "weeds" you have. If it's say 5% or less you could have pollination problems on those. Then I would figure a yield hit. The problem is you can't test that it would haveave yielded any higher or lower. I've had corn that came up over a month make 200. Do I know looking at ear size that it might have yielded more if it had all come up in the beginning. I think do.
So you know I now believe emergence trumps spacing. |
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| shank - 5/16/2018 06:16 A lotta guys claim corn all needs to come up in three days? I had good planting conditions. But have some plants just coming up late? I don't know if its week germ? It was in moisture with no hard rain on it ? They actually need to come up within 12 hrs of one another for max yield. Yes, any corn plant emerging 8 days late is a weed, unless your population is extremely thin. Most of the time, that plant won't even produce an ear. |
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Newfane NY | I did that last year with two different locations and I was shocked at how much yield was lost and even the day 3 emerged corn plant |
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Illinois | NEILFarmer - 5/16/2018 07:33
Well with last years cold wet spell early we raised 250-275 bushel on bunch of weeds. Not what I want but I think some have listened to Greg Sauder a bit too much.
That never happened. I read on here they have to come up within seconds of each other or you might as well mow em off.
All joking aside. I would be looking for the reason. 8 days isn't ideal |
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SE Kansas | Research out of Kstate Extension Parsons research center showed the last 2 years that there is no statistical yield difference on varying emergence at 20,22. 25K populations. I do believe emergence matters with high pops 30K + and in irrigated or high rainfall enviroments throughout the growing season. HERE we loose our top end yield when summer rains shut off and corn isnt quite finished. Finishing before the rains quit is more crucial than a picket fence row stand for top yields. Now 8 days is getting far enough away that that late emerging corn plant has lost its yield potential but no overly important in my IMO |
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SE MN Still in Pothole Country | One here and there a weed. Big enough spot later planted test area. |
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WC IL | Any time I have flagged plants that were late emerging, say 4 days or more, where it is a single plant, those plants most of the time end up short, spindly, and produce no ear. A few plants, no big deal. My best corn yields have always come in years where emergence was extremely even, followed by favorable weather, of course. |
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| mhagny - 5/16/2018 08:18
shank - 5/16/2018 06:16 A lotta guys claim corn all needs to come up in three days? I had good planting conditions. But have some plants just coming up late? I don't know if its week germ? It was in moisture with no hard rain on it ? They actually need to come up within 12 hrs of one another for max yield. Yes, any corn plant emerging 8 days late is a weed, unless your population is extremely thin. Most of the time, that plant won't even produce an ear.
After seeing what I saw last year I would say you are 100% wrong, totally agree with NEILFarmer above. |
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North Central Illinois | Here's what is true.
Corn plants respond to neighboring plants that are a different stage the same way they respond to weeds, triggering more vegetative growth and reducing grain yield of both the early and late emerging plants. The thing is, both "weeds" produce a harvestable ear. |
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South-central Nebraska | Hilltop Husker - 5/16/2018 08:07
It would depend on how many "weeds" you have. If it's say 5% or less you could have pollination problems on those. Then I would figure a yield hit. The problem is you can't test that it would haveave yielded any higher or lower. I've had corn that came up over a month make 200. Do I know looking at ear size that it might have yielded more if it had all come up in the beginning. I think do.
So you know I now believe emergence trumps spacing.
Flag it and compare the ear at harvest. |
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WC MN | Somewhere in St. Louis, at the end of a brightly lit hallway sits a chemist, working on a seed treatment that kills the germ of its host when all of its neighbors have seen a sunset and they have not. Thanks for the opportunity. |
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Princeton, Indiana | "Uneven emergence can reduce yield by 10-20% when 1/3 plants emerged two weeks late or later" -(Carter, 1989; Nafziger, 1991)
corn.agronomy.wisc.edu/Extension/PowerPoints/2004_01_FAPM-StandVariability.pdf
corn.agronomy.wisc.edu/Pubs/UWEX/NCR344.pdf
https://www.extension.purdue.edu/extmedia/NCH/NCH-36.html
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NEMO | "Pioneer Purpling". Most on here know what I'm referring to. In the winter time, at seed meetings, its even emergence and growth preaching. In spring/summer when the purple sets in and makes the corn plants and their neighbors EXTREMELY uneven "it'll come out of it and be fine, very little yield loss". Honestly can say, I've raised some of my best corn after the "purpling affect". So, I don't buy in real big with the uneven emergence crowd. |
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Morris, IL | Yeah I don’t think it is ideal and i’m tickled pink about our near perfect corn stands this year but 8 day first to last would have been generous last year. Some tore up started over, if I had started doing that wouldn’t have finished planting corn till first of June. And beans pushed back. Corn we planted second week of may did as good but was just a couple three day window. There are just way to many variables in farming, if it was easy everyone would do it. |
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NE, KS | Depend how many GDUs are in that 12 hrs. If there is 25 GDU then yes 12 hrs. If there is 5 GDU you might 2 days |
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Pilot Grove, Missouri | Flag some of the early and late emergers and check ear size at harvest. Patrick |
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| Galen - 5/16/2018 22:24
Depend how many GDUs are in that 12 hrs. If there is 25 GDU then yes 12 hrs. If there is 5 GDU you might 2 days
Great comment. Hadn’t thought to look at emergence timing in those terms before.
Edited by sparrell 5/17/2018 05:35
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WC Mn/Dakotas | I suspect it matters more if it is one late surrounded on either side earlier emergers, and this happening very frequently throughout the field.
Also the number of gdu accumulated in the time delay. If the days are 30gdu each it would be more drastic than if the days were 3gdu.
I decided to do some checks this year. Good zone vs poor zone and Deltaforce vs stock jd airbag (2 different growers)
Here is 1st day of Deltaforce on one field. Double white flags is poor zone and double orange is good zone. Poor zone was low yielding and has low residue, is blacker and a few degrees warmer. Good zone yielded higher and has more residue. Poor zone is off on a headstart, but will eventually run into issues and fall behind or possibly drown out.
Edited by GOOSEPILOT 5/17/2018 07:05
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Northeastern Pa. | This is why I have a sonar system on our old 7200 6 rn planter. The sonar will pick up a rock laying at less than the 2 " planting zone and shut my seed meter off until it passes over the rock. I don't want that seed germinating before the ones planted at 2" as 1/2 of my yield would be lost. I'm just glad our corn is up unless it gets flooded out this week. |
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| Galen - 5/16/2018 21:24 Depend how many GDUs are in that 12 hrs. If there is 25 GDU then yes 12 hrs. If there is 5 GDU you might 2 days True. |
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| https://www.exapta.com/wp-content/uploads/2015/09/emergence-uniformity.pdf -- data from Jasa at UNL |
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| NEILFarmer - 5/16/2018 06:33 Well with last years cold wet spell early we raised 250-275 bushel on bunch of weeds. Not what I want but I think some have listened to Greg Sauder a bit too much. Just think what it would've made with uniform timing of emergence! |
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WC Mn/Dakotas | Yes neil that is good yields, but you didnt get those because you had a poorer stand, you got them in spite of the fact. So i think what greg says still applies. I dont think there is much greg says that doesnt come from university or general sound argonomic data. He has just brought to light more and happens to have a number of tools you can use to better manage things. They are not all going to add 5 bu each for everyone. A few of the tools might help you and your situation that dont do much for me. Pick and choose and carry on. |
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Northern Nebraska | Who sells those?! |
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Newfane NY | I think he forgot to add the New Ag Talk approved meme for sarcasm. *** |
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Northern Nebraska | Understood but it still would be cool. |
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Is a corn plant that comes up 8 days later a weed?
