Yellowing of leaf tissue w/ the leaf vein remaining green- Fe chlorosis.
You may be using a nute w/ insufficient Fe, but I think it's more likely the lower availability of Fe @ higher pH. Try dropping it down to 6.0- 5.8.
Foliar feed w/ a good micronute @ about pH 5.5 should clear it up quickly.
Best I can do- can you get a pic in focus?
Brown/yellow spotting likely a Ca issue- again, try dropping yer pH.
Last edited by rhizome; Jun-14-2008 at 12:28.
Reason: to mention potential Ca issue
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