I fed my lawn 10 lbs/k of organic chicken pellets (4-4-2) with 10 lbs/k of milorgranite last week. Also added some ironite 2 weeks ago. Lawn is turning is nice dark green. But there are some blades that are still light green.

Can I feed some soybean meal, ironite and milorgranite today?

You could but you would be better served with patience. One to two weeks is not enough time for everything to breakdown and or be absorbed.

The light green grass could be something unwanted in your lawn.

GaryCinChicago wrote:You could but you would be better served with patience. One to two weeks is not enough time for everything to breakdown and or be absorbed.

The light green grass could be something unwanted in your lawn.

Anyway of knowing what is unwanted?

Anyway of knowing what is unwanted?

First, just simple visual comparisons.

Is this grass lighter than the majority of the lawn?

Is this grass in question evenly distributed throughout the entire lawn ...?
... or only growing in patches*?

Is this growing in full sun or shade?

Does this grass grow faster & taller than the rest of the grass?

Does this grass have wider or narrower blades of grass compared to your lawn?

Does this grass grow upright and erect or sideways and prostrate - compared to your lawn?

If you step on this grass, does it stand back up like the rest of the lawn or stay matted down?

* This link has some examples of patches of unwanted grass http://www.agry.purdue.edu/turf/tips/2004/poa618.htm

Is this grass lighter than the majority of the lawn? no
Is this grass in question evenly distributed throughout the entire lawn ...? yes
... or only growing in patches*? no
Is this growing in full sun or shade? sun
Does this grass grow faster & taller than the rest of the grass? no
Does this grass have wider or narrower blades of grass compared to your lawn? no
Does this grass grow upright and erect or sideways and prostrate - compared to your lawn? no
If you step on this grass, does it stand back up like the rest of the lawn or stay matted down? stands up

Process of elimination. Great so far.

Next question is what KBG cultivars do you have in the lawn? Some, especially Common Types, just can not get as dark as others because of their genetic makeup.

GaryCinChicago wrote:Process of elimination. Great so far.

Next question is what KBG cultivars do you have in the lawn? Some, especially Common Types, just can not get as dark as others because of their genetic makeup.

Cant answer that. I know its Kentucky Bluegrass and the sod was installed last October by the contractor.

macarciero wrote:

GaryCinChicago wrote:Process of elimination. Great so far.

Next question is what KBG cultivars do you have in the lawn? Some, especially Common Types, just can not get as dark as others because of their genetic makeup.

Cant answer that. I know its Kentucky Bluegrass and the sod was installed last October by the contractor.

Well, I think there lies the probable culprit, the unknown to "But there are some blades that are still light green"

Now, I wouldn't worry about it. Have you seen the two threads in the cool season forum showing contractor's sodded yards? Both lawns are VERY nice when cared for properly.

Also, a lot of people's KBG mixes here contain Bedazzled, which too is a lighter colored cultivar by genetics. So actually, your lawn is not unique or any different than most here, truthfully.

When the lawn is cared for, the lighter colored cultivar adds a depth of field to the lawn. In lower light conditions, the lighter cultivar makes the lawn shimmer and sparkle when looked at certain angles. This all adds character to the lawn.