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  1. #1
    Silver Member
    Join Date
    Apr 2002
    Posts
    209
    Location
    Clarksburg, Pa(Between Indiana and Saltsburg Pa)
    Tractor
    Cub Cadet 7272,Farmall 544

    Default RoundUp

    Hi,

    I am making a 1 acre DEER food plot on and old field and mowed the old pasture grass down to a couple of inches high. I then sprayed with concentrated UltraMax Roundup. How long do you think I need to wait to till this under to minimize the amount of weeds I have come up in my new clover mix plot. Can I till it right away or is there a period of time it takes for the weeds to ingest and use the roundup?
    I will be using a KKII tiller to fix the seed bed.

    Thanx,

    Jerry

  2. #2
    Veteran Member
    Join Date
    May 2002
    Posts
    1,499
    Location
    Newnan, GA
    Tractor
    NH TC29D

    Default Re: RoundUp

    I can't answer your question exactly. However, what little I do know about Roundup would lead me to wait until I see the effects of the herbicide on the existing weeds.

    I see you are in PA. Haven't checked the Weather Channel on this, but I would suspect your temps are still on the cool side. Roundup works better (read faster) in warmer temps. Therefore, I would expect it to take a week or longer to see significant effects.

    Don't know if this is helpful or not.

  3. #3
    Platinum Member prosperity's Avatar
    Join Date
    Aug 2000
    Posts
    689
    Location
    North Central Pennsylvania
    Tractor
    JD 2520

    Default Re: RoundUp

    Roundup works into the plant in 24 hours. However, Roundup is most effective when the plant is at or near maturity (the plant is fully grown). Roundup will control (kill) most everything you get it soaked on. The only problem is that Roundup won't work on weed seed that is already in the soil. For that you need a chemical that is a pre-germinate (won't let the seeds grow). I would strongly suggest you contact your local extension agent. They can help you choose the right chemical to use at the right time. Every County in Pennsylvania has an extension agent (Dept of agriculture out of Penn State).

  4. #4

    Join Date
    Jul 2001
    Posts
    198
    Location
    Northern Sacramento Valley, Calif.
    Tractor
    JD 300B, JD 4310

    Default Re: RoundUp

    You don't have to wait. In the early years of Roundup, when a lot of folks thought it had some residual effect, I conducted an experiment. I sprayed a solid patch of crabgrass that was to be my garden. Four days later, before it turned brown, I tilled it in and planted the seeds. I got normal germination (85- 90%). I now know that I could have done it even sooner.

  5. #5
    Veteran Member
    Join Date
    May 2002
    Posts
    1,499
    Location
    Newnan, GA
    Tractor
    NH TC29D

    Default Re: RoundUp

    I am curious about the time year when you did this. Our Extension Service guru has a radio show here and this topic comes up periodically. According to him (and it makes sense to me) this type of herbicide must be absorbed through the leaves and transported to the roots of the plant in order to work. This process occurs very quickly in warm weather - I have seen results in our hot summers within a couple of days. However, in cooler seasons, the process takes longer.

    The Roundup has no effect on the germination of new seeds as I understand it. But if you want it to kill the existing weeds / grass, I assume there is a minimum time one must give it to work before tilling the ground. Otherwise, it would seem to me, the new crop will be infested by the "un-killed" weeds".

    As was previously mentioned, the Roundup will not prevent the sprouting of weeds from existing seeds already in the soil. A pre-emergent herbiside will address this problem, but may also interfere with the germination of the seeds you plant.

    I have now exhausted my entire knowledge base of weed control. And, sadly, it may not be entirely accurate.

  6. #6
    New Member
    Join Date
    Jun 2002
    Posts
    9
    Location
    South LA.
    Tractor
    Satoh S-650G

    Default Re: RoundUp

    I make Roundup.The ultramax has a brand new surfactant in it. It is a much more hi-tech version than the old label Roundup. The new surfactant makes the plant ingest the glyphosate a whole lot faster than before.We watched thermal images of a plant being sprayed with Ultramax Roundup and the old version of Roundup. The Ultramax plant began to turn red from the outside in and was totally red in either 15 minutes or an hour I can't remember.

    From what I've gathered from the "experts" that actually engineer this stuff is that after a day the plant is dead and not going to recover. The plant is dead fom day one (depending on the plant as brush takes longer) and only turning brown because it cannot ingest water because the roots have been killed. It would be much like our body being deprived of oxygen completely.We would be dead after 7 minutes but we might not be really decomposing for a couple of days.

    So the softer the plant the quicker it works. For weeds I would agree with the person above who said after a couple of days it would be safe to till them under.

    Racechaser

  7. #7
    Platinum Member
    Join Date
    Jul 2000
    Posts
    951
    Location
    Sierra Foothills, Northern California
    Tractor
    Kubota B7300; JD LX233

    Default Re: RoundUp

    Yeah, those plants are already dead, but they might not realize it yet [img]/forums/images/graemlins/smile.gif[/img]. You can till them under now. But it is also true that Roundup has no effect on seeds, so you may see weeds popping back up. Just deal with 'em when they are small and they shouldn't be too much trouble.

  8. #8
    Bronze Member
    Join Date
    Nov 2001
    Posts
    60
    Location
    SE PA, USA
    Tractor
    Kubota L3430HSTC

    Default Re: RoundUp

    I just purchased Roundup WeatherMax for use in our vineyard. Is this formulation similar to the Ultra ?

    Thanx,


    Tony

  9. #9
    New Member
    Join Date
    Jun 2002
    Posts
    9
    Location
    South LA.
    Tractor
    Satoh S-650G

    Default Re: RoundUp

    Yeah same stuff. The weathermax actually soaks in and won't wash off it is applied at least a couple of hours before the rain.

    Racechaser

  10. #10
    Elite Member thcri's Avatar
    Join Date
    Jan 2003
    Posts
    4,667
    Location
    Minnesota SE
    Tractor
    New Holland TC29D, 2001

    Default Re: RoundUp

    Bmac,

    I am going to back your statement up some. I sprayed Roundup two years ago to get ready for my sod. It was in August when it was warm. In four days you could see the plants wilting. The following spring I sprayed some Roundup to get ready to seed. It was two weeks before I saw any sign of wilt and it took another two weeks before everything was dead. The chemical has to get to the roots before it can do it's damage.

    Just my experienc.

    murph

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