Germinating plants on a sponge
I'm getting ready to start a hydroponic unit with 6 classes of elementary students. Since funds are tight, is it possible to use sponges soaked in nutrient for the germination phase or is there an even cheaper way? Can I also use 20-20-20 or 20-15-20 fertilizer that contains micronutrients but add a little more epsom salt and calcium nitrate to the mix?
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Peat pellets work good and they are cheap enough. I don't use any nutes until the plants are up and growing, and then at 1/4 to 1/3 strength.
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