In this case you must take density into account. It gets more complicated when mixing by volume and not mass, liquid nutrients. Liquid Nutrients and Specific Gravity - Volume Measurements This means we have to take into account conversion factors to calculate the percent elemental P and K. Similarly, the labels lists the percentage K2O instead of the percent K. the fertilizer label lists the percentage P2O5 instead of the percent P. It should be noted that P & K are different animals depending on how they are put in the mix.īy convention in the U.S. Phosphorous and Potassium - Beasts of another nature Of Sulfur comes along with the 40 PPM of magnesium. Now that also brings some sulfur and we can calculate that, Epsom is 9.7% Magnesium and 13% Sulfur.Ĥ12 x 3.785 = 1560.8mg or 1.56 grams per gallon to get 40 PPM of Magnesium. So lets say you want 40 PPM of Magnesium from Epsom salt. To figure out how much of something to add to get a given PPM you divide the target PPM by the percentage The calcium nitrate also has 19% calcium.
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So for basic dry (mass) calcs just take 264 times the percentage and you know how many PPM of something you get with a gram per gallon. Of nitrogen by adding 1 gram to a gallon. Grams per Gallon x 264.2007926023778 x Label Percentage = PPMĬalcium Nitrate is 15.5% Nitrogen therefore we get, Say we are adding half a gram of Calcium Nitrate to 1 Liter of H2O and we want to see how much calcium and nitrogen we added in PPM, we know the calcium nitrate is 19% Calcium.įirst get the mg per liter from gram per gallon: If we want to calculate how much of a given nutrient is in the mix using the label ingredient percentages we can make that happen with a little math. This is all fine and dandy for figuring out how much of everything is in your mix but what if you want to get more specific and determine how much of a given nutrient is present in your mix. Since different substances in the water will conduct electricity with varying degrees of resistance we must understand this number is only an estimate.
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This is then converted to a PPM number with a conversion factor. PPM is commonly measured by a grower using an electronic pen which measures the electrical conductivity of the water (EC).
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Basically the idea is to quantify how much “stuff” is in your water. PPM (Parts Per Million) can seem like a mystery but it’s actually very simple. Please note that the final volume refers to the total solution volume, which is the combined volume of the stock solution and the volume of solvent/diluent used for dilution.Understanding and Calculating Nutrient PPM
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This is the volume that results after the volume from the stock solution ( V 1) has been diluted with solvent or diluent to achieve a total diluted volume of the final solution ( V 2).