In subsequent years, always fertilize with ammonium sulfate in March or April. To each plant, apply 4 ounces of ammonium sulfate in year two, 5 ounces in year three, 6 ounces in year four, 7 ounces in year five, and 8 ounces in year six and subsequent years. Retest the soil every 5 years or so to make sure that the soil pH is in the correct range. If nutrient deficiency symptoms (e.g., light-green or red leaves in the summer, poor growth, poor yield) appear, it is likely that the soil pH is no longer in the optimum range of 4.5 to 5.0.
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