I have a 6 year old tangerine tree giving fruit for past 3 years.  Have been fertilizing and watering per nursery advice except no ammonium sulfate added until last year (this year adding 1 cup in spring, summer and fall per nursery advice).  Fruit is falling off again this year, as in past 2 years - just after starting to turn color, about 2-inches diameter.  That fruit is super bitter.  Throwing it in the compost pile by the bushel this year.

It gets full sun from morning until about 3pm when shade from a nearby tree shades it for the rest of the day. Leaves, etc, all look healthy & no insects or diseased look.  Soil test shows in the proper ranges.

I'm about out of ideas.  Any ideas about what to do try?

Bob

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I have a 6 year old tangerine tree giving fruit for past 3 years.  Have been fertilizing and watering per nursery advice except no ammonium sulfate added until last year (this year adding 1 cup in spring, summer and fall per nursery advice).  Fruit is falling off again this year, as in past 2 years - just after starting to turn color, about 2-inches diameter.  That fruit is super bitter.  Throwing it in the compost pile by the bushel this year.

It gets full sun from morning until about 3pm when shade from a nearby tree shades it for the rest of the day. Leaves, etc, all look healthy & no insects or diseased look.  Soil test shows in the proper ranges.

I'm about out of ideas.  Any ideas about what to do try?

Bob