- 1). Read the individual amounts of nitrogen, phosphorous and potassium listed on the package of fertilizer you are using.
- 2). Write the number of pounds of each element, and state the numbers as a ratio by inserting colons. For instance, if the fertilizer contains 10 pounds of nitrogen, five pounds of phosphorous and 10 pounds of potassium, write 10:5:10.
- 3). Reduce the numbers, if possible. For instance, 10:5:10 can be reduced to 2:1:2.
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