In order to determine the actual percentage, it is necessary to do a little arithmetic. For example, if you have a 25-3-7 formula fertilizer with 7.6% of water-insoluble nitrogen, multiply the 7.6 by 100 which equals 760. Divide the 760 by the total percentage of nitrogen shown on the bag. In this case, dividing 760 by. 25 equals 30.4%. Thus 30.4% of the nitrogen is in fact insoluble.
This example would mean that you’re fertilizer is at the high end of medium acting fertilizer. Heavy concentrations might cause some burning of your lawn. Always use a spreader to apply fertilizer to your lawn. Spread lightly and use several applications that crisscross your lawn. Instructions on the fertilizer bag will help to ensure that consumers avoid any chance of burning their lawns.
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