That’s really not a very high dose. My understanding is that Epsom Salts adds about 7µS/cm per ppm Mg, so your 300µS dosing was about 43 ppm Mg, which falls in the range of recommended level for someone feeding 100 ppm N weekly (30-60% of the N).Hello Ray,
your help is much appreciated! I tried that, as you mentioned it to me on a similar problem. I gave it once a high dose of epsom salt in water (300 µS) and twice a small amount with my regular fertilizer. But on the gigantifolium there was no recognizable effect. I hope the dosage was ok?
It's not. There is simply no way it can give a reasonable solute concentration, because different ions have different conductivities for the same ppm concentration and they can change when in combination.