I buy magnesium sulfate in 50 lb. bags and sprinkle it around palms and other plants that show signs of older leaf chlorosis. I've been happy with the results. If that doesn't work, I've really been fooling myself and worse, giving out bad information. I need to check this out. I know plants will not take up iron if the soil is too alkaline so I have sprayed liquid iron on the foliage and had success. This magnesium thing is big news to me and it shouldn't matter if we are talking in the ground or in the tank.
Jim
