May or may not be about N. I don't think any harm would come from spreading a cup of urea or the equivalent under the drip line and watering it in to find out- assuming the soil seems the same as that of other trees, and you can find no physical cause by poking around the soil- particularly near the crown. Different varieties are said to react differently to any given nutritional deficiency in the soil.

If I was to do it I'd either do it right away or wait til Sept. No point in encouraging a late burst of growth.

Soil isn't the same. Pretty sterile. I fertilize trees in this area every year because of that.

I did give it a cup of granular. Will see what happens.

Update: I already see a distinct improvement in this tree. Leaves are darker green and just look better in all respects. [I also removed about 1/3 of the developing fruits, not to stress it]

Think I'll go feed a couple of the other trees in the same area.