Ammonium Sulfate

Discussion in 'Organic Lawn Care' started by terrapro, May 10, 2009.

  1. terrapro

    terrapro LawnSite Bronze Member
    Messages: 1,234

    I have a customer that insists on an ammonium sulfate app because it was reccomended by the extension office. I am trying to sell her on a compost app to go with it and a C/T and molasses app.

    Ive used urea spread lightly under compost with good results but never ammonium sulfate. They reccommended 5lbs per K so I was going to half that to help to keep the fert burn down.

    Also should I still be able to apply the C/T and molasses? This wont cause more burn when involving the ammonium sulfate in the mix will it?

    It might end up just an ammonium sulfate, C/T, and molasses app. Would this cause any burn?
  2. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Messages: 2,636

    Depends on the salt content of your compost... if it is low, it will help the 21-0-0
  3. treegal1

    treegal1 LawnSite Gold Member
    Messages: 3,911

    just lay it on her, if the soil ph is high then maybe a need...... oh shite did i just say that.....
  4. terrapro

    terrapro LawnSite Bronze Member
    Messages: 1,234

    Soil pH is high-ish, so is the compost. Salt content of compost is 1.1 dS/m.
  5. growingdeeprootsorganicly

    growingdeeprootsorganicly LawnSite Senior Member
    Messages: 766

    terra, you applied urea, why are you up tight about the AS?

    AS is basically the same as the urea except with sulfur

    sulfur is a necessary secondary/macro plant nutrient. plus your soil is alk?
  6. terrapro

    terrapro LawnSite Bronze Member
    Messages: 1,234

    Ive never spread ammonium sulfate under compost before. Wasnt really sure about how the evaporative gases would deal with being locked in by the compost. Then watering which will speed up the dissolving and releasing of gasses maybe compounding the issue.

    I guess I am being more paranoid then I need to be. It is on 38K of turf so that could be a pricey replacment process.

    Yes this property is alkaline, this is my second alky this spring. :confused:
  7. growingdeeprootsorganicly

    growingdeeprootsorganicly LawnSite Senior Member
    Messages: 766

    apply it on top then if your worried?:) and go light maybe? my best guess along as you don't over apply you will be fine... big yard!
  8. upidstay

    upidstay LawnSite Bronze Member
    from CT
    Messages: 1,584

    Seems like all extension services are stuck in the agricultural mind set. All the recomendations I see here in CT are old farmer tricks. Everybody wants 10-10-10. The cheapest crap fert they can get their hands on. Recomended by people with phd's at the end of their name!!
  9. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,335

    My recommendation to clients who insist they need synthetic N is take the recommended rate and reduce it by 2/3.
  10. dishboy

    dishboy LawnSite Fanatic
    from zone 6
    Messages: 6,169

    Urea is a lot more volatile than AS , AS under or over compost should not be a issue. No way would I apply 5lbsK of AS unless you want to be mowing twice a week.

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