Backyard citrus extravaganza

Today we fed the citrus trees in left-hand side of our backyard.

The leaves have been looking a little yellow and we suspect an iron deficiency, which is consistent with the fact that in several leaves the veins appear to remain green, while the rest of the leave is yellow. Iron deficiency is often caused by a high soil Ph that makes iron unavailable to the trees. However, root damage cause by overwatering can lead to similar symptoms so we need to watch out.

This is what the trees looked like today:

See how the fig tree in the middle is much greener than the orange and tangerine trees. And now take a look at close-ups of the cytrus trees:

This is what we gave the trees

• Dr. Earth Organic 9™ Fruit Tree Fertilizer 7-4-2. A blend of feather meal, fish bone meal, cottonseed meal, kelp meal, alfalfa meal, soft rock phosphate, mined potassium sulfate, seaweed extract and Pro-Biotic seven strains of beneficial soil microbes plus Ecto and Endo mycorrhizae. It contains 7% Nitrogen, 4% Phosphoric Acid, 2% soluble potash, 5.3% Calcium, 2.22% Sulfur.
  
  The instructions advise to give one cup per inch of tree trunk diameter, so we gave 6 cups to the orange tree in the left (6 in trunk diameter) and 4 cups to the tangerine tree in the right (4 in trunk diameter).
  
  I mixed the fertilizer in water and tried to poor it uniformly in the whole area under the canopy. However, it did not dissolve very well so I don't think that mixing it in water helped at all.

• Greenall F.S.T. (Iron and Sulfur), which contains 19% Sulfur, 33% Iron, 0.50% Manganese and 0.50% Zinc.
  
  The instructions advise to give 1pound per inch of tree trunk diameter, but we only had 8 pounds so we gave about 4.5 pounds to the orange tree in the left (6 in trunk diameter) and 3.5 pounds to the tangerine tree in the right (4in trunk diameter).
  
  The F.S.T. was sprinkled under the canopy, mostly near the drip line.

Hopefully the Greenall F.S.T will do the trick. We did not (yet) apply it to the tangerine tree by the house, which appears to have the same problem. We will see if the two trees that were given the F.S.T improve upon the other one.

We also took this opportunity to apply one barrel of the compost that we have been doing. We applied it somewhat uniformly to the two citrus trees mentioned above and to the fig tree between them.