By Jack Christensen Posted: 01/27/2012 07:04:26 PM PST Updated: 01/27/2012 07:08:34 PM PST 1 Apply the first of four feedings for mature citrus trees this week or next. Subsequent feedings should be done in mid-March, late April and mid-June. For each feeding, apply 0.4 pound of actual nitrogen per tree (to total 1.6 pounds per year), spread around the drip line. Since one pound of any dry fertilizer equals about two cups, that is about four cups of ammonium sulfate, two overflowing cups of ammonium nitrate, or 1.5 cups of urea, each time you apply it. 2...
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