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Nitrogen formula

Discussion in 'Pesticide & Herbicide Application' started by onemancrew, Jun 8, 2004.

  1. onemancrew

    onemancrew LawnSite Member
    from tn. #7
    Messages: 95

    I have lost the formula for figuring the pounds of nitrogen in a bag of fertilizer. Thanks in advance.:confused:
  2. Grassmechanic

    Grassmechanic LawnSite Silver Member
    Messages: 2,697

    for a 50# bag, divide the first # (N) by two. I.E. 25-5-15 has 12.5 # of N.
  3. Fvstringpicker

    Fvstringpicker LawnSite Fanatic
    Messages: 7,670

    The numbers represent the percentage in the bag. For example a bag of 25-5-15 would have 25% Nitrogen, 5% phosphorus and , 15% potash. Therefore, you'd simply multiple the weight of the bag (or product) by 25% for lbs of N.

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