fert. calculation tool

Discussion in 'Pesticide & Herbicide Application' started by jake65, Dec 27, 2005.

  1. jake65

    jake65 LawnSite Member
    Posts: 75

    Is there such a tool that will calculate or convert nitrogen, phos, and potas. and the amounts needed per sq. ft given the sq ft desired??


  2. ThreeWide

    ThreeWide LawnSite Bronze Member
    Posts: 1,116

  3. jake65

    jake65 LawnSite Member
    Posts: 75

  4. Russ

    Russ LawnSite Senior Member
    Posts: 539

  5. YardPro

    YardPro LawnSite Gold Member
    Posts: 3,563

    yea, it's called a brain..... lol sorry couldn't resist...
  6. Landscape25

    Landscape25 LawnSite Member
    from Florida
    Posts: 199

    This is for 1 lb. N for 1,000/ sq. ft. in case you don't have access to a computer.

    Eg. 17-2-11 50lb. bag

    Divide 100 by 17, because 17 is based on a hundred pounds. This gives you 5.88 lb. This will be the total amount of fert. you need per 1,000 sq. ft.

    The whole bag covers 8,500 sq. ft. for N because it is a 50 lb. bag.
    8,500 divided by 1,000 = 8.5
    8.5 x 5.882 lb. = 50 lb.

    If you want .5 lb N per 1,000 sq. ft. use half the amount.

    Yeah, the Google method is definitely easier, but not always practical.
  7. TforTexas

    TforTexas LawnSite Senior Member
    Posts: 260

    Just multiply the weight of the bag by the percetage of N, P or K posted on the analysis. A 50 pound bag of 20-10-10 has 10 punds of Nitrogen and thus will do 10,000 Sq ft @ 1lb of N per 1,000

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