seeding after crab grass control

Discussion in 'Organic Lawn Care' started by Pristine1, May 1, 2009.

  1. treegal1

    treegal1 LawnSite Gold Member
    Messages: 3,911

    Iwill 2nd that...
  2. upidstay

    upidstay LawnSite Bronze Member
    from CT
    Messages: 1,584

    Yes, a good aeration and power raking will shatter the chemical barrier created by the pre-emergent.

    Heard from the manufacturer of Dimension and Pendimethalin that the chemical does in fact create a chemical barrier in the soil. There are no systemic properties.
  3. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    I would like to see the How it Works on that supposed 'barrier'.
    I have done a lot of searching already and found nothing of a 'barrier'.
    Telling people they can shatter the 'barrier' with aeration, is... welll... u know....
  4. ICT Bill

    ICT Bill LawnSite Platinum Member
    Messages: 4,115

    Interesting question, we had a minor league field in the mid atlantic call us. Their seeding program was failing big time the field only had 60% coverage and they had the season starting up in 4 weeks.

    I asked why so little coverage, what happened, fungal issues last year? NO, they said, we mistakingly put down 16 times the amount of dimension that we were supposed to in November (my head of course is spinning, 16X and in November??? what ***hole would do that, apparently I had him on the phone)

    Plan of action, our compost tea at 4X the rate once a week, continue seeding after the second week. Just spoke with them 2 weeks ago right after the season started and it worked like a charm, I have asked for pictures

    So if you have to get something out of the soil that is a problem, send the bio boys in to eat it for lunch. There are many that consider things like that as food
  5. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    For microbes, just about everything is food and/or broken down one molecule at a time. Life on this planet would cease without microbes.

    We have overseeded with just smoothing out the dead spots with topsoil on supposedly pre-m ground. Actually I don't think the stuff is all that effective that it can overcome much volume of soil.
  6. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

    Do I dare play devils advocate and use this moment to remind people that synthetics don't kill the microbes in the soil.. unless overly concentrated?

    Hmmm... I probably shouldn't.
  7. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,335

    Yes, you probably shouldn't given that general statement is wrong. I'd be willing to bet a fungicide will kill mycorrhizal fungi, regardless of the concentration.

    Do you know the effect of all synthetics on microbe population dynamics? I don't, nor does anyone else. How is it you do know?
  8. ICT Bill

    ICT Bill LawnSite Platinum Member
    Messages: 4,115

    If you want to look at it another way, by applying "whatever" you are selecting for certain strains of microbes. It is a strategy that can be used to your advantage

    Find the guys that are most prevelant at a toxic spill and chances are they like the toxin as food.

    microbes wear a lot of different hats depending on the trigger, food or environment, they produce enzymes, motabolites, slime, etc. If we can select for certain ones get good to great populations and use known triggers to our advantage............well...... it is often to our advantage
  9. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    I had the pleasure of being involved in a toxic spill... involving a gasoline tank...

    I learned from the "Cleanup Crew" ... that the naturally occurring microbes that eat this stuff had been - enhanced - to eat gasoline even quicker.

    This 'NEW bug is now - named and copyrightted - as the official spray for toxic waste problems... :)

    Natural processes would have done the job... but the bio-engineered stuff was 'garanteed' to do it within bureaucratic paramaters... :laugh:
  10. Barefoot James

    Barefoot James LawnSite Senior Member
    Messages: 984

    Did they kill the lawn last fall? Did the lawn have crabgrass last year? If so leave it alone and let the pre do its thing and seed in fall. If the lawn had no crab before, the be up front and honest with customer and let them now you have zero idea if the seed you put down "now' will germinate but you are going to try a few techniques to do your best.
    First use a high quality seed - Pennington Smart Seed with mycorrhizae, power seed it in deep and top dress it with finished compost. Water 3 to 4 times a day for 3 weeks - even if it just rained and plan on repeating process in fall - sorry great lawns cost $$$ - thats why we do what we do.

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