Funny! I was about to post the same topic. Mine has been like this the past 4 years. My front yard is very shaded. But it gets early sun. My backyard is very open. The sun is blocked by the house early, but full sun rest of the day. Both my front and back look the same. Very yellow/green St. Aug. I have put down corn gluten/reg corn, green sand, molasses. Here is not the problem. IMO.
1) The extra heavy rain lately
2) To much Shade/Sun
3) The Organic Program- (i've herd this is the problem)
Here is what the prob is. IMO. *** Note*** My house had St. Aug when I bought it. I planted St. Aug 2 years ago in diffrent spots. All of it has changed to the yellow/green.
I think it is a nutritional problem. Not iron though. Maybe. Mag, Potassium, micro. I'm not really sure which one yet. I am going to get this weekend, a organic fert, with a lot of micros, I don't know which one yet. I will apply and let you know the results.
I know this is not much help. But, if we try, and post results, we will all help each other.
Regarding the text in green, you are kidding, right?
Corn gluten meal is the organic answer for those wishing to add nitrogen which, from what I understand, helps the grass to "green". (I like the Alliance Milling brand myself, but they quit making it for some frustrating reason, so if you can still find some, get it)! Photosynthesis is important as well. Not just important, but critical.
Our plants have not been receiving the sun they usually get because of the weather. I have a feeling this may be part of the "problem". A sprig of grass grew up into our garage and it was beige from lack of sun.
Otherwise, it appeared to be quite healthy.