You now know that you need to adjust your ratio from 1:100 to 1:200.
per gallon of water, the missing variable is the injection ratio or setting that you need to mix the solution at 50 ppm, so R = injection ratio.: Step 1 Since you now know that you mixed 6.67 oz. per 8 gallons, and so on for other gallon containers. If you are using an 8 gallon container, multiple 6.67 oz. 100 ppm x 100Īnswer = 6.67 oz per gallon to obtain 100 ppm at a 1:100 ratio setting. You could choose any ratio setting to find the ounces per gallon needed, but choosing 1:100 makes it much easier to calculate your settings. Also, choose 1:100 as your injection ratio. You could choose 50 or 200, but choosing 100 simplifies calculations. Choose 20-20-20 and solve for 50 ppm, 100 ppm and 200 ppm. If mixing the fertilizer for various ppms, you will need to choose one ppm as your base for a 1:100 injection ratio and then calculate the other ratio settings for the other ppms.Įxample: If you have various fertilizers such as 20-20-20, 10-52-17, etc., choose nitrogen (the second number) as the chemical to determine your ppm.įormula: Recommended ppm x injection ratio/75 (constant) x % fertilizer.
To calculate what injection ratios would provide other ppms of the same chemical mixture, follow the steps below. If you have a tank size of more than one gallon, multiply your answer by the number of gallons. The tank size or gallons is one gallon here. The 150 = the recommended ppm for the crop the 100 = the injection ratio the 20 = the % of active ingredient the 75 is a constant conversion factor used for finding ppm (1 ounce of any 100 percent soluble fertilizer or chemical in 100 gallons of water always equals 75 ppm). How much fertilizer should be put in the solution tank?Īnswer = 10 ounces of fertilizer per gallon of water. You have your injector set at a 1:100 ratio. The following example is a fertilizer application, but the principle applies to any chemical solution.Įxample: You want to fertigate at 150 ppm of nitrogen using a 20-10-20 soluble fertilizer. To determine the pounds (or ounces) required if you know the ppm of chemical per gallon of water needed follow the steps below. For both methods four factors are critical: 1) the desired ppm or the weight of the chemical added 2) the % of active ingredient 3) the injection ratio and 4) the tank size in gallons.
#HOW TO CALCULATE PPM TO CONCENTRATION HOW TO#
Method B outlines how to use the formula from Method A to calculate changing injection ratios once your solution is mixed. Method A gives a formula for finding the pounds of chemical or fertilizer per one gallon of water delivered to the source, if you know the ppm required. The following outlines ways to figure the amount of chemical injected per gallon of water. If you don’t have a chart, you can still determine how to correctly mix the chemical to the amount of water in your container. Once you know the desired ppm, you can usually find a pre-calculated chart on the back of the chemical bag or container listing the equivalent ratio, percentage or ounces per gallon. Contact your local agricultural extension agency or other expert for assistance.įor other non-horticultural applications, contact an authority for the application. The best way to determine fertilizer needs is to have the soil or foliage tested. Neither the chemical manufacturer nor the injector manufacturer is responsible for specifying a ppm for the user’s application. The user must decide what parts per million (ppm) of chemical is right for the particular application. The next step is to determine the amount of chemical required for the application. Premature failure of the seals, o-rings, dosage piston, inner cylinder and check poppet can also occur. This causes clogging in the injector, and the proper dosage of solution will not be dispensed. If product is added beyond the solubility limit, it will not dissolve, but will settle out in the solution container. If you have determined that the product is water soluble, the next step is to identify the chemicals solubility limit. These guidelines only apply to water-soluble chemicals.
When using a water-driven injector to dispense the chemical, it is imperative that the chemical be water-soluble. We have dedicated this portion of our website to provide our distributor network with additional product support. How do I calculate my ratio setting and ppm?
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