So, you put 44 oz (2.75 lbs.) of 15-5-10 fertilizer per gallon in the concentration tank to achieve 250 ppm of nitrogen in the irrigation water. (galct is one gallon of water in concentration tank). Then, Step 2 determines how much 15-5-10 to put in the concentrate tank. Step 1 calculates the amount of fertilizer needed in the irrigation water to have a concentration of 250 ppm of nitrogen. Assume you want 250 ppm of nitrogen using a 15-5-10 fertilizer and the injector is set at 1:200. This is an example of using Equation A to calculate the amount of a formulated fertilizer needed in the concentrate tank when the concentration desired in the irrigation water is in ppm of nitrogen. To help with this, I use the subscript "iw" to indicate irrigation water and "ct" for concentrate tank. Also keep in mind when you are in the irrigation water and when you are on the other side of the injector in the concentrate tank. As you do these problems, keep in mind when you are working with a formulated fertilizer and when you are working with ppm of a particular element. If you go to another source, the information may look a little different. I use this method because it is important to understand what you are doing with the different steps. Note that there are several ways of doing these calculations. But when the amount of fertilizer being used in the concentration tank is known and one wants to find the ppm of an element in the irrigation water, use Equation Form B. When the desired ppm of a particular element in the irrigation water is known, use Equation Form A to find how much fertilizer is needed per gallon of irrigation water. This equation is often written in two forms (Table 1). To make this simpler, there is an equation for converting between ppm of an element and oz of fertilizer. To convert weight and volume measurements to ppm, this is the standard equation: Working with ppmĪ difficulty we have in these calculations is that we can't weigh or measure "ppm." These calculations are made more difficult because our (U.S.) weights and measures are not based on the metric system. The same thing applies when injecting liquid fertilizers, acids or other liquid chemicals multiply the volume per gallon wanted in the irrigation water by the injector dilution factor to obtain the volume to put in the concentrate tank. For example, with a 1:128 injector and 0.3 ounces of fertilizer per gallon wanted in the irrigation water, multiply 0.3 ounces by 128, which equals 38.4 ounces of fertilizer per gallon in the concentrate tank. Therefore, when the amount of fertilizer per gallon of irrigation water is known, multiply by the injector dilution to obtain the amount per gallon to put in the concentrate tank. The thing to remember in doing calculations for injectors is that the fertilizer will be at a higher concentration in the concentrate tank than in the irrigation water. If the injector ratio is 1:100, this means 1 gallon of fertilizer concentrate is added to each 100 gallons of irrigation water. Calculating for the Injectorįertilizer injectors take fertilizer solution out of a concentrate tank and inject it into the irrigation water.
To do this, you must determine how much of the fertilizer to put in the concentrate tank (or stock solution) so the injector gives the desired concentration in the irrigation water. For this, we normally use a fertilizer injector and make a concentrated fertilizer solution. For example, you may use a 20-10-20 fertilizer on poinsettias to supply nitrogen at a concentration of 300 ppm. This concentration is expressed as parts per million (ppm). Fertilizer recommendations are most often given in terms of the concentration of a desired element in the irrigation water.
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