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Posted by yiorges-z5il (My Page) on
Thu, Jun 17, 10 at 18:10

I have both a pin oak & river birch with this problem, Chlorosis (Iron deficiency)

1) The illinois soil has a good supply of iron (FeSO4) but the soil pH is 6.8 For the iron to be utilized by these trees the pH needs to be 5.5

2) I wanted to use sulfur to lower the pH but the directions say to "mix the sulfur in the top 6 inches of soil".

3) these trees are in an established lawn and the trees have a caliper of 20 inches or more

4) HOW can I incorpoirate the sulfur under these conditions?

5) There was a sugestion that if the soil pH was lowered more than 1 point it would result in tieing up nitrogen & iron ect.... is this so?

6) tried to contact the supplier of the sulfer (Fertilome) several days ago but no response.

Follow-Up Postings:

RE: chlorosis

Here is an article that might answer your questions. In the short term you might try a foliar spray that contains chelated iron to help the trees. Any acidic fertilizer like Mir-Acid should do the trick, but those aren't recommended for long term use since they usually contain aluminum sulfate.

I used to live in northern IL and Pin Oak is notorious for doing poorly up there. A good substitute if you ever plant any new trees is Hill's Oak (Quercus ellipsoidalis) and a good substitute for Red Maple is Freeman Maple (Acer x fremanii). I am surprised the River Birch is chlorotic as I have seen many large, healthy specimens growing in the northern parts of IL.

Here is a link that might be useful: Iron Chlorosis

RE: chlorosis

I must assume you have already studied the University of Illinois at Urbana-Champaign article on chlorosis. I only mention it just on the off chance it was overlooked since you did not mention how you ruled out magnesium and zinc deficiencies.

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