Fertilizing Your Garden: Vegetables, Fruits, and Ornamentals
Fertilize acid-loving shrubs with ammonium sulfate (21-0-0-24) to lower soil pH. For mature bushes, use 2/3 to 3/4 pound (about 1 1/3 to 1 1/2 cups) ammonium sulfate per bush. For younger plants, use one-third to one-half as much, depending on age. For lower analysis organic materials, increase the application rate proportionally.
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