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Overseeding pre-m treated lawn....

Discussion in 'Organic Lawn Care' started by Pristine1, Jul 2, 2009.

  1. Pristine1

    Pristine1 LawnSite Member
    from Maine
    Posts: 81

    Ok, i asked this about 6 weeks ago, and we all pretty much agreed that it wouldn't be a good idea then.

    Quick background....lawn was treated w/crabgrass control and fert 3rd week of April. No noticeable response from initial fert app. Since then, I have taken over the lawn, aerated and topdressed w/compost, then fertilized with nutrients plus. Lawn responded well to compost and organic fert, briefly. Now back to light green. Pretty sure it is due to the crappy seed put down last fall (Brand new lawn). I will be picking up my soil test on Monday, so I'm sure that will tell me quite a bit.

    Customer really wants to overseed lawn. We have had a ridiculous amount of rain this spring/early summer....June set a record for wettest ever. Plus the lawn is irrigated, so plenty of water has fallen on this property

    I'm thinking that I will seed the week after next. That will be a solid 10 weeks since the pre emerg, plus a ton of rain. I will be aerating and top dressing along with the seed for a second time.

    Any thoughts????
  2. mdlwn1

    mdlwn1 LawnSite Silver Member
    Posts: 2,443

  3. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,080

    Many lawns of all kinds are yellowing around here as well, due to the excessive water. Some of the heavier soils became waterlogged and were suffocating for air. Sandier soil just kind of washed clean of any nutrients.

    In short, what is it about the appearance of the lawn that helps you identify the seed? whether good or bad?

    The light green color is more likely a soil problem - not necessarily a seed brand problem.
  4. Pristine1

    Pristine1 LawnSite Member
    from Maine
    Posts: 81

    I know you are right small.....the existing turf has no KBG, just a standard builder's mix. I don't know the original mix. I will have the soil test results back on Monday, I'll post them here and see what you all think. They were taken prior to my original compost topdressing.

    My plan is to go in with a high end mix very heavy on the KBG to allow for the current lack of it.
  5. ICT Bill

    ICT Bill LawnSite Platinum Member
    Posts: 4,115

    Where are you in Maine? I do believe that you guys have had about 977777and 4 inches of rain in the last 2 months.

    Reasons that it is yellowing? lack of sun, too much rain, all the fert washed away. You are on the right track though

    wait for seed in late August or early September
  6. Pristine1

    Pristine1 LawnSite Member
    from Maine
    Posts: 81

    OK, here are the ugly results....(Lbs/acre available)
    PH 5.5
    P: 156
    K: 225
    Ca: 1004
    Mg: 144
    CEC: 10.1

    %Base Saturation
    K: 2.9
    Ca: 25
    Mg: 6
    H: 66.5

    OM3: 4

    OK, what to do now.....
  7. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,080

    Looks like besides adding compost , add lime as well.
    Do they bag clippings ?
  8. Pristine1

    Pristine1 LawnSite Member
    from Maine
    Posts: 81

    They do bag clippings for now.....I am going to work on this down the road. I did lime it already, with solucal. I think I should go with a dolomitic limestone to increase the Mg.

    In about 2 weeks I will be aerating and composting again, along with overseeding. The mix will be heavy on KGB, so by the time it germinates it will be mid Aug. which is a decent time here in Me, the nights begin to cool, and the days aren't too hot....highs in the mid 70's. The place is also irrigated so I should be good on seeding.

    I may even compost a 3rd time in October....but we'll see.
  9. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,308

    Assuming those numbers are ppm, why?

    The numbers for Ca and Mg (assuming ppm), are sufficient with respect to nutrients.

    The only "good" reason for adding lime would be to raise the pH, and to be honest, if you have already limed, I wouldn't bother doing it again until you have tested a minimum of 1 year from the application date (assuming top dressed lime app).

    Now increasing the OM% is something that will both increase your CEC and help buffer the pH, among the other host of good things it will provide.

    Basically it comes down to this. Don't fight the natural tendencies of the soil/system, instead, work with them.
  10. Pristine1

    Pristine1 LawnSite Member
    from Maine
    Posts: 81

    My main focus is to get that OM% up asap....put 6yds on in May, gonna do another 6 in 2 weeks. (the area is about 9k sq.ft.) The lawn is currently a very light green, do you think it is the PH, or something else in the results? I will be seeding with a KBG/perennial rye mix...50/50 by weight, so many more KBG seeds.

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