The Tropical Fruit Forum

The first 3 photos show an iron deficiency. The symptoms of an iron deficiency in citrus are leaves with dark green veins on otherwise a yellowish leaf.  The deficiency is caused by a lack of the mineral iron, or also the plant growing in a high pH medium.  Picture #4 shows a manganese deficiency.  Manganese deficiencies are rather common on newer growth, and the plant should correct the situation on it own. The last picture I am not sure what the problem is.  Did you recently spray the plant with something?

Good luck.

Relatively low temperatures (night 50F to 65F) promote citrus flowering.  Increasing the chilling temperatures from 2 to 8 weeks increases both the number of floral shoots and flowers per shoot. In semitropical and tropical citrus growing areas, winter water deficit stress is imposed on citrus trees of all cultivars to compensate for inadequate exposure to low temperature during mild winters.  Winter water stress to induce flowering is commonly practiced  by Florida growers and other warms growing locations to promote flowering.

Poncirusguy, nice looking container tree.  Well balanced.

Galatians 522,   thanks for the article on the history of Parson Brown and his oranges.  Anyone even slightly interested in the citrus industry has heard of the Parson.  Enjoyable reading.  Thanks again.

Once again most all oranges produce TRUE from seed.

 In the case of citrus, not all but most citrus seeds do grow true to their parent.

 True from seed:  Almost all sweet oranges, true grapefruit, lemons, pure mandarins (other than King & clementine), most tangelos, hybrid tangerines and Tangors (except Temple).  Most pummelo do not grow true from seed. 

Your tree is showing a strong apical bud dominance.   The apical bud is where new plant growth and elongation occur. But that’s not all the apical bud does. The apical bud produces a plant hormone, auxin, that flows through the plant’s vascular system (phloem) down the stem, and inhibits the elongation of axillary buds which would otherwise produce new side shoots from the plant cells.
  I would cut off the top 25 percent of the top of the  tree, which will cause your tree to produce side ranching.

Yes, But for soil application through the roots you would be better off using a ammonium nitrate formula.

I don't think your trees symptoms come from the LED lighting.  The leaves are showing the typical sign of an iron deficiency. The leaf symptoms for iron deficiency are:  New leaves with green veins on otherwise yellowish leaves. An iron deficiency is often caused by high pH rather than a shortage of minerals.

Was the fruit load heaver last year than this year?

I have not grown Early Saint Ann, but i have grown Xie Shan for7 or 8 years in zone 5 greenhouse, and it is ready in September.  I would also add, that at several of the Southeast Citrus Expo citrus best taste testing contests that I attended Xie Shan was the winning variety both times.