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Post by sidrun on Feb 14, 2012 4:07:49 GMT -5
The leaves are curling downward, not upward. I found that plants with higer pH are less damaged - what to think about that?
Perhaps it is manganese toxicity?
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swampr
Global Moderator
Posts: 230
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Post by swampr on Feb 15, 2012 11:09:49 GMT -5
It's apparent that your pH is too low. It may be difficult to isolate other less significant variables, and solve, without first addressing that problem.
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Post by sidrun on Feb 19, 2012 6:38:22 GMT -5
The first is manganese toxicity and the second is magnesium deficiency. Both induced partially by low pH + Mg-Mn antagonism.
Any objections?
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swampr
Global Moderator
Posts: 230
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Post by swampr on Feb 20, 2012 8:28:53 GMT -5
How do you tell Mn2+ toxicity from Al2+ or H+ ?
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