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nitrate limited pond?
My 2 yr old pond still presents a conundrum. 500 gallons, full sun, z5,
readings always within range, ammonia and nitrate always read zero, never any suspended algae, but SA, clear water, under my fish load, don't feed them, lots of plants of all types, 75% coverage, K, iron and magnesium (low in my area) added regularly, the K weekly along w/BZT. But... The marginals never grow well. The lilies I fertilize, and the WH seem fine, but the irises, arrowroot, blue pickerel, equisetum (dwarf horsetail), all in pots of clay + pebbles, never grow well. Leaves are puny, older leaves yellow. I remember a thread a year or so ago about nitrate-limited ponds and adding potassium nitrate, which can't be legally purchased in my area. If these plants were in the soil, I'd say they're missing nitrogen. Is there any other N source I could try out on the pond (carefully)? I thought the growing goldfish population would change that this year, but it didn't. Any suggestions? |
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