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A product that includes magnesium, nitrogen, phosphoric acid and potash describes a good guava fertilizer. The percentages need to be 6 to 10 percent each for nitrogen, phosphoric acid and potash and 4 to 6 percent for magnesium, except for fruit-bearing trees whose phosphoric acid and potash content respectively must be altered to two to four percent and 15 percent. Common commercially available mixes show up as 6-6-6-2 and 8-3-9-2 and tend to be supplemented by boron, copper, manganese and zinc sprays spring and summer and, if necessary, iron sulfate treatments .

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Q: What is a good guava fertilizer?
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