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Fertilization Question

Discussion in 'Homeowner Assistance Forum' started by mc11b80, Feb 8, 2014.

  1. mc11b80

    mc11b80 LawnSite Member
    Messages: 3

    Ive been trying to educate my self on proper fertilization ratios. My question is this. If I wanted to apply .5lbs N per 1000, is there a difference in applying a fertilizer with higher number like 28 at a lower rate versus a lower number such as 10 at a higher rate?
  2. ShaneW

    ShaneW LawnSite Member
    Messages: 63

    This isn't a fertilizer question. It's a math question.

    28-0-0 is 28% N by weight. 10-0-0 is 10% N by weight. So, if the 28-0-0 was in a 100-lb bag, 28% would be 28 pounds, right? Most likely it's a 50-lb bag if you're buying a professional product, so instead of 28 pounds, you have 14 pounds of N. One pound of N per 1000 sq ft would mean you'd be covering 14,000 sq ft. Half that rate would obviously go twice as far.

    There is no difference between 15-0-5 and 30-0-10 as far as coverage per thousand, IF you're spreading each product at an equal rate of pounds of N per thousand. 30-0-10 will not provide any greater boost to your lawn, but it will help you use fewer bags on a large property.

    Make sense?
  3. mc11b80

    mc11b80 LawnSite Member
    Messages: 3

    That cleared it up for me perfectly. Thanks.
  4. windflower

    windflower LawnSite Bronze Member
    Messages: 1,093

    Some fertilizers are slow release and some (usually cheaper) are not. Typically a slow release will list how much N is available immediately. If both types have the same N number the slow release will not green as much as the water soluble version.

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