- 1). Convert the ounces of fertilizer that you've added to the mixture into grams by dividing the ounces by 0.0353. For example, if you added 0.5 ounces of fertilizer to the mixture you would get: (0.5 ounces) divided by (0.0353 grams/ounces) equals 14.16 grams fertilizer.
- 2). Pick one nutrient to find its PPM. On fertilizer labeled 10-6-5, the 10 is nitrogen, the six is potash, and the five is phosphate.
- 3). Multiply the nutrient number from the label by the grams of total fertilizer added to find the amount of nutrient in the solution. For example, if you chose nitrogen from 10-6-5 fertilizer and had added 0.5 oz to make the liquid fertilizer, the equation would be: (0.1 nitrogen) times (14.16 grams) equals 1.416 grams nitrogen.
- 4). Convert the volume of the fertilizer mixture from gallons into liters by multiplying the number of gallons by 7.6. If you have 2 gallons of solution, your equation would be this:
(2 gallons) times (3.8 liters/gallon) equals 7.6 liters. - 5). Find the PPM of your fertilizer mixture by dividing the grams of the nutrient by the number of liters in the fertilizer mixture; multiply the result by 1,000. Using the examples from previous steps, your equation will be: (1.416 grams of nitrogen) divided by (7.6 liters) x (1,000) equals 186 PPM.
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