glyphosate need help please

Discussion in 'General Industry Discussions' started by glengraf, Mar 22, 2011.

  1. glengraf

    glengraf LawnSite Member
    from Florida
    Posts: 4

    A month ago I mixed some glyphosate concentrate at a .5% mixture with the goal of killing all the weeds in my yard and then laying sod .

    I was going to lay sod on it this weekend but I think I really messed up. Did the amount I laid down now prevent me from growing sod there for a year?

    Thanks in advance
     
  2. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,670

    Nope. Read the label and it will tell you how extremely short lived its effectiveness is. Half percent mix is nothing. I have my sod jobs sprayed by a CPO that uses 5%. Quick and thorough 2 weeks later sod goes down.
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  3. glengraf

    glengraf LawnSite Member
    from Florida
    Posts: 4

    Thank you for the quick reply Patriot.

    I am such an idiot! I did a 5% ! mixture not .5%. so taking that into consideration what do you think?

    If I buy some grass seed and throw it down to see if it takes is that a way to see?

    I'm not doubting you but what threw me this morning is the bottle of Ortho ground clear concentrate says it is 5% glyphosate and it kills for a year?

    Thanks again
     
    Last edited: Mar 22, 2011
  4. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,670

    I was speaking of Roundup. Is there something else in the Ortho that would make it so long lasting. Straight RU is done pretty quick.
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  5. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,670

    Yea, it has Imazapyr in it with the glypho. I am still highly skeptical of the 1 year claim. You could always lay a small area and see if any problems arise. Some serious irrigation would probably wash it away that it would not be a problem.
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  6. ReddensLawnCare

    ReddensLawnCare LawnSite Bronze Member
    Posts: 1,652

    Yeah I dont see it effecting it for a year. That is on the verge of soil sterilization and I dont think ortho is going to sell you something that would do that too easily. I could be wrong though. From now on..just use Roundup..it works better and is cheaper in the long run if you get the concentrate.
     
  7. Runner

    Runner LawnSite Fanatic
    Posts: 13,496

    You are fine. 5% is close to an average mix to kill turf areas. The season long type killers use salts as sterilant. Of course, some would depend on what you cal a "5%" mixture. What was the % of concentrate, and how much did you mix? When I say say a 5% mix is close to an average, that is based on a 5% of a 41% mix.
     
  8. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,670

    I base my 5% on what the manufacturers label says constitutes 5%.
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  9. txgrassguy

    txgrassguy LawnSite Gold Member
    Posts: 3,083

    First of all simply applying straight glyosphate regardless of the a.i. percentage has no impact whatsoever once it comes in contact with the soil. Glyosphate requires contact with leaf tissue on a plant that is actively growing as the salt gets translocated to the apical meristem where cellular interruption occurs causing plant death especially in monocots like C4 turf. You can even seed when the chemical is still wet from the application without harm to the seed.
    Regarding residual activity in whatever additional chemical is present with the glyosphate as a carrier simply roto-till to a depth of three inches or so to break the chemical bond of the residual herbicide, lay the sod and you are good to go.
    Oh, and for what it's worth, a 5% solution of glyosphate = throwing your money away. If you want a decent absorption try acquiring in the 41-44% a.i. range then add a additional surfactant. Then you'll see results.
     
  10. glengraf

    glengraf LawnSite Member
    from Florida
    Posts: 4

    I bought 2.5 gallons of inhibitor plus from a online rural supply house - rural king.

    It is very interesting about the contact with the leafy substance for it to be active. I have postponed my 4 pallets of sod as a courtesy to the supply house. I didn't want to leave them hanging.

    I'll wait a few more weeks and finsh the job, thanks again to all for your time.
     

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