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Originally Posted by John
Good discussion. Can you translate ppm into tsp/gal? What are your thoughts about using 10-50-20 at some stage instead of 30-10-10?
John
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For what it's worth PPM = mg/L. Regarding the 10:50:20 idea. Why such a high concentration of phosphorus? To be honest, I've never seen orchid bloom formulations in my part of the world with a P value higher than 20ppm [P2O5] - most are around 10-15ppm [P205]. Even general purpose blooming fertilizers designed for annuals don't get much over 30ppm [P2O5]. FWIW K values in our orchid bloom formulations range from 20-30ppm [K2O].
Andrew