Ask a Question forum: Calling all plant Doctors: Is this a nutrient deficiency?

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Huntsville, AL
Nullthumb
Jun 1, 2018 2:30 PM CST
i'm growing several varieties of blueberry plants in the backyard, but suddenly the pink lemonade ones have started turning yellow on the new growth, with green only visible around the veins of the leaf.

I've been treating them with chelated iron, but there's been no effect. (!)

The pictures tell a terrifying story.

Any ideas what could be wrong? How do i treat this if chelated iron is not having an impact?


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Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Jun 1, 2018 2:54 PM CST
You should only have to add iron chelate once in early spring. If its not working, I would guess that the pH of your soil is too high making the iron unavailable to your blueberries. Are you top dressing with milled peat moss every year? I think I would water in some ammonium sulfate (or other acid fertilizer) and see if that helps.
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Huntsville, AL
Nullthumb
Jun 1, 2018 3:05 PM CST
I've been using Epsoma soil acidifier for a few weeks. Does it take longer to take effect?

Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 1, 2018 3:25 PM CST
Do you know what your soil pH is and therefore how much it needs to be lowered? High pH can block manganese (not magnesium) as well as iron, and going too high on iron can also negatively affect manganese availability. Manganese deficiency produces similar symptoms to iron deficiency, i.e. green veins but paler in between and starting on the youngest leaves. The Espoma, as far as I can tell, is sulfur which is the recommended treatment for lowering soil pH but it may take a while to work.

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