Do you need a scale to measure fertilizer?

Discussion in 'Fertilizer Application' started by recycledsole, Mar 9, 2014.

  1. recycledsole

    recycledsole LawnSite Gold Member
    from MD
    Messages: 3,262

    Hey guys, just wondering what method most of you use to measure your fertilizer before putting it in the spreader and applying it?

    Thanks in advance for your comments
  2. easy-lift guy

    easy-lift guy LawnSite Gold Member
    Messages: 3,372

    No. As a general rule nearly any bag of fertilizer is based on the sq.footage of the lawn and what type of spreader used to spread same material. It has more to do with common sense than anything else.
    easy-lift guy
  3. RAlmaroad

    RAlmaroad LawnSite Silver Member
    from SC
    Messages: 2,249

    The use of a "Good" household scale give me a consistent and accurate weight/K A gram scale is a must for most of the herbicides/K. I even have a larger scale to weigh out larger than 10lb/K of soluble fertilize. When using a product like 20-20-20 solubles that only comes in 20lb bags then I use the weight stated on the bag. Of course, the liquids are per ounce and a good measuring cup is also a must. I even have a graduated tablespoon SS beaker for more exacting mixes.
  4. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,670

    When you calibrate--you just put in a 50 pound bag and apply to a big lawn until you have used it all--then measure the area you covered (carefully with measuring wheel). If that does not suit your situation: Use a kitchen scales capable of weighing out around 10 pounds--apply to measured 2000 sqft and weigh what ever fert remains. If you cannot afford the kitchen scales use bathroom scales--accuracy is only fair so--start with 20 pounds. Then mark your spreader with lines to indicate how many pounds you have added. Use tape to mark how many sqft each line in the spreader should cover for that round. A line in the hopper should show enough for 2000, 5000, 8000 sqft and so forth; change the markings when you switch to summer fertilizer.

    However--I do not think it is necessary to weigh the fert each time you begin an application. If you like to be extremely accurate and you have an accurate sqft measurement--then its up to you.
  5. recycledsole

    recycledsole LawnSite Gold Member
    from MD
    Messages: 3,262

    oh ok thanks guys
  6. easy-lift guy

    easy-lift guy LawnSite Gold Member
    Messages: 3,372

    Another consideration would be your pound to ratio of NPK. Another words remember that if you are working with a 50 lb bag if 16-4-8 your actually spreading 8-2-4 NPK, since the actual NPK is based on 100 lbs
    easy-lift guy
  7. countryclublawnllc

    countryclublawnllc LawnSite Member
    Messages: 153

    I've always used a 5 gallon bucket. Just pre-weigh varying amounts in five lb. increments and use either tape or a permanent marker to put marks on the bucket. Quick and very easy to use.

  8. recycledsole

    recycledsole LawnSite Gold Member
    from MD
    Messages: 3,262

    thanks a lot that is helpful
  9. DA Quality Lawn & YS

    DA Quality Lawn & YS LawnSite Fanatic
    Messages: 9,266

    Once you get your rate down, no need to meas just mult lawn sq ft times product/K and there you go.
  10. lilmarvin4064

    lilmarvin4064 LawnSite Senior Member
    Messages: 757

    that is incorrect. It is based on 100%, which is what percentages are based on, not 100 lbs. The quantity of your material may determine how many pounds of NPK you have, but the analysis does not change.

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