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http://www.rosebay.org/chapterweb/jpchange.htm
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"Never use aluminum sulfate to increase soil acidity as it is toxic to many plants including rhododendrons. This is a most important point! Under no circumstances should you use aluminum sulfate (Al2SO4) around your rhododendrons. As was pointed out in a previous article, soluble aluminum is toxic to rhododendrons. The chemical, aluminum sulfate, is soluble in water thus the aluminum component is immediately available – and toxic - to the plants. As the pH level of the soil decreases, the aluminum component becomes increasingly soluble – and thus increasingly toxic. Therefore, although aluminum sulfate will certainly reduce the soil acidity, it can, and will, quickly injure and may even kill your rhododendrons. Even though the plants may tolerate small quantities of this material, why should any quantity of a toxic material be added to the soil when other perfectly safe materials such as sulfur are available?"
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Tips for Beginners: How To Adjust Acidity Levels in Your Soil
http://www.rhododendron.org/v46n2p77.htm
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