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icky
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Found this doing research: Looks like I'm causing the problem with bad water and low temps. Gonna have to flush! Potassium - Too much sodium (Na) displaces K, causing a K deficiency. Sources of high salinity are: baking soda (sodium bicarbonate "pH-up"), too much manure, and the use of water-softening filters (which should not be used). If the problem is Na, flush the soil. K can get locked up from too much Ca or ammonium nitrogen, and possibly cold weather. Will cause slow growth and yellowing.