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help needed to calculate ppm

This is a discussion on help needed to calculate ppm within the Phalaenopsis ('moth orchid') Information forums, part of the Frequently Asked Questions category; hi everybody, i use a fertilizer mix that reads 5 15 30 and its a ...

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  1. #1
    sharath's Avatar
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    Default help needed to calculate ppm

    hi everybody, i use a fertilizer mix that reads 5 15 30 and its a 10gms pouch they say u have to dissolve it in 5 liters of water. i am bit confused about calculating ppm of NPK. i used the ppm calculator. N 109 P 144 K 542 and i really dont now its right or not can somebody help me thank u

  2. #2
    Halloamey's Avatar
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    Hi Sharath, PPM is equivalent to mg per litre, here goes the calculation.

    NPK 5:15:30 means that your fertilizer is 5 % N, 15 % P and 30 % K and the remaining 50 % is binding material which ideally should be inert.

    1 gram (g) is 1000 milligram (mg)

    therefore 1 g fertilizer contains 50 mg N, 150 mg P and 300 mg K.

    Now, PPM stands for parts per million,
    i.e a solution with a concentration of 1 ppm has 1 part of the solute in a million parts of solvent.
    therefore a 1ppm fertilizer solution is a solution of 1mg fertilizer in 1 million mg of water,
    1 million mg of water is 1000 g which is 1 litre.

    So if you dissolve 1 g of your fertilizer in 1 litre of water you will have 50 ppm N, 150 ppm P and 300 ppm K.

    I usually fertilize my plants with a balanced fertilizer which is 200 ppm of each NPK ( 1g 20:20:20 in 1 litre water.)

  3. #3
    Alana's Avatar
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    Great explanation!

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