You can use the nutrient solution provided by the calculator to grow vegetables using the Kratky Method, or any other type of hydroponic growing method. Changing the quantities allows the same four ingredients to make nutrient solutions for both Tomatoes, and Lettuce, as well as other plants. If the ppm is still too high, you can wait for the plant to lower the water levels, or you can change the reservoir water. Repeat until your reservoir reaches a safe fill point, or the ppm is in the correct range. It uses Masterblend 4-18-38 Tomato fertilizer as its base, and also requires Calcium Nitrate, Magnesium Sulfate (aka Epsom Salt), and water. DWC Reservoir ppm is too high/low: Too high: Add plain ph’d water to the reservoir and test. The fertilizer calculator uses the mixing instructions provided by the MHPGardener Youtube channel for both Tomatoes and Lettuce. Masterblend Hydroponic Mixing Instructions So to simplify the process, I made up a hydroponic nutrient solution calculator for lettuce and tomatoes using Masterblend 4-18-38 fertilizer, Calcium Nitrate, and Magnesium Sulfate. Since the Kratky method allows us to grow in just about any lidded container that can hold water, there is a constant need for me to calculate how much nutrient-solution (fertilizer water) I need to mix up for the various container sizes I use. I seem to be always in the process of growing either hydroponic lettuce using the Kratky Method I wrote about in a previous article, or I am growing tomatoes.
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