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Pelletized Gypsium

Discussion in 'Pesticide & Herbicide Application' started by AltaLawnCare, Mar 11, 2003.

  1. AltaLawnCare

    AltaLawnCare LawnSite Senior Member
    Messages: 961

    Anyone here heard of putting pelletized gypsium on a lawn?

    It supposedly helps loosen the soil...??
    sounds like a gimmick to me.

    Does it have any benefit?
  2. Here is a link to CSU extension office article on Gypsum.
    They recommend top dressing and I have found that to work the best.
    With gypsum - We have seen some improvement to clay soils where we used it on a regular 2x year basis and 5-7 lbs per K.
    We are going to try a product new to us this year-Huma Cal-
    made from humate and gypsum-
    I'm hoping this will be an effective granular top dressing-haven't got my shipment yet, but am anxious to see how it works.

    On gypsum
    This company also gave me some good info.
    Calcium Products Inc.
    e mail info@agrigrowth.com
    fax 507-889-4381
    I could not get through to their web site so I don't know if that link is still good.
  3. kootoomootoo

    kootoomootoo LawnSite Platinum Member
    Messages: 4,369

    Works great on clay based lawns. It binds the clay particles
    together and helps drainage. It also raises the PH like lime will.
    Its all about negative and positive charges in the soil.
    Plenty of info around.
  4. AltaLawnCare

    AltaLawnCare LawnSite Senior Member
    Messages: 961

    Thanks, guys..
    That answers the question.

  5. Gypsum doesn't effect soil PH. get yout soil in proper base saturation, soil will be less compact.
  6. philk17088

    philk17088 LawnSite Fanatic
    Messages: 17,386

    My prof for Soils class warned against using gypsum to correct anything. Said that it can play havoc with the soil's chemistry. Adversely affect fertilization and false results on soil test.
  7. Won't effect ph, but could effect ca base saturation of soil
  8. kootoomootoo

    kootoomootoo LawnSite Platinum Member
    Messages: 4,369

    Gypsum is PH Neutral but like everything in out molecular little world it reacts with many things found in the soils. When gypsum reacts with the carbonates and bicarbonates in soil, compounds like water and lime, and sulfuric acid are often formed, which again, can raise and lower the PH. To say it has no affect on PH is untrue.
  9. kootoomootoo

    kootoomootoo LawnSite Platinum Member
    Messages: 4,369

    I should have added that the use of gypsum increases pH when applied to acid soils in the southwestern United States. That increase is due to complex reactions with soluble aluminum.
    The sulfate is absorbed onto the aluminum and iron minerals in the subsoil. These minerals give up a hydroxy group (OH) when the sulfate is absorbed. The calcium from your gypsum bonds with these hydroxy groups, creating lime, which raises the pH of the subsoil. The aluminum no longer reacts with the roots, and the pH of the subsoil goes up. The roots can now grow deep into the subsoil and begin to take up the water that was there all along.

    But hey ........ who really cares.......getting a bit technical for most.
  10. AltaLawnCare

    AltaLawnCare LawnSite Senior Member
    Messages: 961

    I care, Kootoo.

    I had a customer talking about using it rather than core aerating.

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