Discussion in 'Fertilizer Application' started by TPnTX, Nov 8, 2009.

  1. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    I disagree that it was no help. Any time the correct knowledge of how a chemical works is brought into the conversation - it helps.

    The pre-m is going to stifle any root growth, Period. Which is generally fatal to newly germinated seeds. Period. No barrier, invisible or otherwise. No barrier at all.
    In response to this comment -"I am wondering though, If I took a spike aerator and perforate it,..."

    Sounds like the word perforate has meaning. I will continue to bash the invisible barrier mentality, just because professional LCO's should know better. Deal with it.
    That should now be 11 and 35 results found. Big deal :laugh:
  2. Smittie

    Smittie LawnSite Member
    Messages: 238

    I'm just south of Fort Worth and got put behind due to rain on putting down rye seed at the last two properties I needed to do. I applied seed week of halloween and checked it on 11/09 and germination rates look good already have seedlings about an inch and a half tall. Try putting out some more seed with the warm daytime temps I think you should be fine.
  3. TPnTX

    TPnTX LawnSite Bronze Member
    Messages: 1,775

    You caught it right. Thats exactly what I thought. You can throw a stick(google) and hit something that says not to aerate after applying pre-m. I just was thinking wildly about what I could do in case I need to re-seed.

    I will say this though. I did a search on "invisible barrier" and I really don't care to read all that crap. You want to learn me something, tell me. Im not interested in the bitterness and the flaming smileys. Then you should back it up with a source if you can. Otherwise Lawnsite is hardly a step up from the guy at Home Depot. You still get to be the rock-star.
  4. TPnTX

    TPnTX LawnSite Bronze Member
    Messages: 1,775

    Here is one document from DOW that may suggest there is a barrier. The mechanics of this barrier may be interpreted in different ways. Thats what I'd like to know also.

    (see the application directions)
  5. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    A "barrier" with respect to a pre-emergent can be considered one where the herbicide is present and active in the layer of soil where germination is most likely to occur. If you can take random samples of soil and find the herbicide present in all samples, then you in effect have a "barrier" of sorts.

    In your case, what you need to concern yourself with is how to quickly reduce the levels of herbicide in the soil. In the case of dimension, aerating & compost application will help to achieve that goal.
  6. TPnTX

    TPnTX LawnSite Bronze Member
    Messages: 1,775

    sounds reasonable. Sounds Like a "invisible barrier"

    Im not trying to bait an argument.
  7. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    I believe the herbicide leaches rather quickly as well, if there is a lot of rain and irrigation, the crabgrass can sprout 2 weeks after application.
  8. TPnTX

    TPnTX LawnSite Bronze Member
    Messages: 1,775

    so.....do you not have a comment or opinion to the dow PDF specifically the "barrier"

    Again man I not baiting you. I am here to learn.

    lol I'm trying to clear this up so I don't end up like a liberal as Reagan described. :)
  9. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    I think Kiril gave as good a desciption as any about why they would use the "barrier" analogy.
    My take on it is that it dissolves and spreads out in the water for a good even coverage. Works best on bare soil. Clods or grass may prevent even distribution, as per your, extended label pdf... this way no seed may germinate w/out taking in some Dimension. But forming a "barrier" is not how the AI works.

    Here is another website description...
    * "Preemergent herbicides are chemicals that prevent the germinating weeds from establishing in the lawn. These herbicides control annual grass weeds by inhibiting cell division in the young root system. The failure of the root system to develop results in the death of the young seedling weed shortly after germination." *
  10. TPnTX

    TPnTX LawnSite Bronze Member
    Messages: 1,775

    alright, Im confused then.

    I thought you had some opposition to the notion barrier, "invisible barrier" mentality as you put it. I believe you said a LC should know better.

    If you agree with Kiril then you are subscribing to a "shield" "barrier" mentality aren't you?

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