Data from OAN/ODA funded research to determine the cause of late season chlorosis in red maples (Acer rubrum).

• Relationship between foliar Mn and plant quality. (Important to read this first.)

• Relationship between soil pH and foliar Mn.

• Relationship between soil sulfur (sulfate) concentration and foliar Mn.

• Relationship between soil ammonium:nitrate concentration and foliar Mn.

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