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Thread: Mixing N-P-K's...

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    Default Mixing N-P-K's...

    If you are an indoor grower like me you might be wondering how to properly add multiple N-P-K ratios together to calculate the overall ratio of your feedings. Sometimes I find it difficult to find the exact nutrient formula I want so I often combine products. Here’s what I do when it comes to mixing.

    When mixing multiple nutrients with varying N-P-K ratios, you need to combine their values to calculate the new ratio. Using simple math you’ll be able to match your feeding’s ratio with your preferred ratio for each stage of plant growth.

    The calculation can be described in four easy steps:

    • Add volumes (ml) together to get overall volume
    • Divide individual volumes by overall volume
    • Multiply result to N, P, and K of each corresponding ratio
    • Add Ns, Ps, and Ks

    For example, if you are combining two nutrients, 5 ml of 1-2-3 and 10 ml of 3-2-1. First, add their volumes:

    5 ml + 10 ml = 15 ml

    Now that you have the combined volume, divide each volume by the overall volume (These example results have been rounded):

    5 ml / 15 ml = 0.3
    10 ml / 15 ml = 0.6

    Next, multiply these results to their corresponding nutrient’s N-P-K ratio:

    Nutrient A (1 – 2 – 3) 0.3

    [N] 1 x 0.3 = 0.3
    [P] 2 x 0.3 = 0 .6
    [K] 3 x 0.3 = 0.9

    Nutrient B (3 – 2 – 1) 0.6

    [N] 3 x 0.6 = 1.8
    [P] 2 x 0.6 = 1.2
    [K] 1 x 0.6 = 0.6

    Now, add the Ns together, the Ps together, and the Ks together

    [N] 0.3 + 1.8 = 2.1
    [P] 0.6 + 1.2 = 1.6
    [K] 0.9 + 0.6 = 1.5

    The combined N – P – K result is 2.1 – 1.6 – 1.5.

    By correctly combining your ratios, you’ll be able to accurately determine what mixture satisfies the plant’s desired ratio.

    Here is the same N – P – K combination example in a more condensed format.

    Nutrient A – 5 ml (1 – 2 – 3)

    5 mL + 10 mL = 15 ml

    5 mL / 15 mL = 0.3

    [N] 1 x 0.3 = 0.3
    [P] 2 x 0.3 = 0 .6
    [K] 3 x 0.3 = 0.9

    Nutrient B – 10 ml (3 – 2 – 1)

    10 mL / 15 mL = 0.6

    [N] 3 x 0.6 = 1.8
    [P] 2 x 0.6 = 1.2
    [K] 1 x 0.6 = 0.6

    [N] 0.3 + 1.8 = 2.1
    [P] 0.6 + 1.2 = 1.6
    [K] 0.9 + 0.6 = 1.5

    Overall NPK – 2.1, 1.8, 1.5

    Lastly, don’t forget to re-check your EC after you mix.

  2. The Following 7 Users Say Thank You to mpsj For This Useful Post:

    barney_b (30-12-21), Blue61 (31-12-21), Deku Nut (30-12-21), funkydawg (30-12-21), GEORGE (30-12-21), Jingo (31-12-21), Mac (30-12-21)

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