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Riddle me this.....

Discussion in 'Pesticide & Herbicide Application' started by Usz, Mar 7, 2008.

  1. Usz

    Usz LawnSite Member
    Posts: 7

    The cost of a 20 pound bag of a 16-4-8 fertilizer is $9.75. How much will it cost to apply 6 pounds of potash?

    Can someone tell me how to figure this out?
  2. silverscapes

    silverscapes LawnSite Member
    from de
    Posts: 88

    about 40 bucks why don't you buy straight potash go to any ag store and get it
  3. Usz

    Usz LawnSite Member
    Posts: 7

    Thanks but I need the actual answer I am not a math wizard:hammerhead:
  4. LawnTamer

    LawnTamer LawnSite Gold Member
    Posts: 3,988

    $36.56 plus tax. That is an expensive way to put down 6 lbs of potash.
  5. Usz

    Usz LawnSite Member
    Posts: 7

    thanks, how did you come to that answer
  6. americanlawn

    americanlawn LawnSite Fanatic
    from midwest
    Posts: 5,859

    You are leaving out one thing....the rate per given area.
  7. Usz

    Usz LawnSite Member
    Posts: 7

    Figured it out, thanks

    20lbs * .08 = 1.6 lbs

    6 lbs/1.6= 3.75 bags needs

    3.75bags * $9.75 per bag = $36.56
  8. bug-guy

    bug-guy LawnSite Senior Member
    Posts: 971

    16-4-8 really means 16 lbs ,4 lbs, 8 lbs per 100lbs of product
    hence a 50 lb bag does 8000 sq ft @ 1 lb of n per 1000 sq ft because there's 8 lbs ,2 lbs, 4 lbs of npk per 50# bag

    this use to bother me when i would push a spreader with a 50 # bag and only getting about 16 lbs of actual fert counting minors
  9. greendoctor

    greendoctor LawnSite Fanatic
    Posts: 9,064

    This is just one of the reasons why I do not do granulars. For me, 6 lbs of K is equal to 13.3 lb. potassium nitrate. A 50 lb pack of potassium nitrate is ~$23, or about $1 per lb of K. My entire fertilizer inventory is not pallets stacked in my garage. It is in 5 gallon plastic pails with covers. I can cover an acre with no more than 80 lb of material.

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