|Picture by George Mead|
Here is a Cabernet Sauvignon vine at veraison. The "burned" leaf
edges when first observed might be cause for alarm. But these are
telling us there is an excess of fixed potassium in the soil.
The symptoms for insufficient potassium and excess potassium are the
same reddish burned leaf edges. A plant tissue test is the best way
to diagnose a high or low potassium problem. The leaf petiole sample
for the test should be taken from the vines showing these symptoms one
to two weeks before harvest. Do not routinely add potassium to
your vineyard without knowing how much you already have in the soil.
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