I think that chart is a good general guideline and as you can see the Nitrogen and Magnesium leaves are yellow which overwatering causes the same symptoms so have to be careful that the problem is correctly identified.

Mark

Good info Bill. Thanks.

Tim

Very interesting. I was going to post up about the odd coloring I'm seeing in a couple young plants where the new growth is very pale yellow but it seems to eventually green up.

Now I'll have to look at the Foliage Pro to see if it has any iron in it.