Nitrogen: All Forms Are Not Equal
leach the growing medium, add a nitrate-based fertilizer and raise temperatures. Under conditions of severe ammonium toxicity an effective method of alleviation is a leaching treatment with gypsum. Topdress 1 tablespoon of gypsum (calcium sulfate) to each 6-inch pot and water in thoroughly with clear water. Follow with a 50 parts per million drench
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