Oak trees Iron defiancy

The majority of the oak trees on the golf course have a chlorotic (yellowing) appearance and some are dropping a few leaves.

Chlorotic (yellowing) color

Defoliation on the left side

 This is due to a Iron (Fe) deficiency.  There is Fe nutrients in the soil around the tree roots, but because of the hi pH of the soil the Fe nutrients are not available to be taken up by the root system of the tree.  Thus causing the yellowing and defoliation of some of the leaves.  With the most of the tree, it is not the entire tree but just a portion of it.  

Here you see a maple tree on the left completely healthy and an oak tree on the right with some yellow leaves

We have put iron tablets in the outer cambium layer of the trees and this will be absorbed and taken up by the tree.  A 1/2" hole was drilled one inch deep, and a medicap plug was inserted on the outer edge of the tree. In about 2-4 weeks the trees will green back up and re-grow any leaves that they dropped.