I'm no Centipede expert but I believe you only want to put down 1.5-2 lbs on Nitrogen/M annually on it and you already put down 1.1 lbs of Nitrogen. I doubt that is causing the yellow spots in the lawn and very well could be an iron deficiency which the iron spray you have should clear most of that up. Centipede naturally has a green apple color to it so getting it darker green will require some additional iron. I would start doing about half rate of what you already put down spread out over every 6 weeks.

Hopefully someone with more experience with Centipede will be along to guide you and either confirm or deny my recommendations.

 

I would definitely focus on spoon-feeding Nitrogen to your centipede instead of giving it 1 pound of N at a time. I've got centipede as well and the past few years have put down a total of just under, or right at, 1 pound of N total each season starting in May and spoon feeding it every so often. I focus more on adding potassium, humic, iron, etc. throughout the season more so than Nitrogen for fear of centipede die-back. Here's my front lawn now with 0 Nitrogen so far this season. It's growing well on it's own, but I may give small amounts of ammonium sulfate starting in May.

 

Agree with the above posts, you may have applied to much nitrogen. I would do a soil test. Look at your ph if it's to high it could also be a reason for yellowing especially considering howuch centipede likes acidic soil.

 

I did have a soil test done at the end of March (Clemson). No amendments were recommended other than nitrogen, 3 lbs/1K, twice during the season, plus 25% because I bag clippings. I'm way below that. Also iron treatments for green up. PH is 6.0, appropriate for centipede it seems.
That being said, I tend to agree with the excess N diagnosis judging from the streaky yellowing (probably from poor granular spreader technique) and a trace of yellow along the edges of the walk and driveway where excess fertilizer would accumulate as I blow those surfaces.
As to the 'spoon feed' recommendation here, I'd like to try that. I have a battery 4 gal 'backbreaker' backpack sprayer. I assume that would be with a liquid N product, XX-0-0 or similar at a very low rate. It would be great if anyone experienced with a spoon feed program could please suggest an example of a product and application amount and schedule to get me started?

 

Did you use a preemergent? When I had centipede I noticed yellowing during green up due to preemergent. A lot of common lawn care practices centipede doesn't like. My backyard is majority centipede and all I do to it is mow it with a riding lawn mower. It's thick and healthy.

 

Did you use a preemergent? When I had centipede I noticed yellowing during green up due to preemergent. A lot of common lawn care practices centipede doesn't like. My backyard is majority centipede and all I do to it is mow it with a riding lawn mower. It's thick and healthy.

I do apply a preemergent, a Hi-Yield product this year I believe, rated safe for centipede.

 

I have noticed a lot of yellowing on centipede and STA both in my area this year vs normal. I'd be curious as well. Agree with hitting it with iron. FEature if you can get it, Ironite if you can't. I don't think too much nitrogen would cause it.

Centipede does pretty well with Milorganite too.

 

I have noticed a lot of yellowing on centipede and STA both in my area this year vs normal. I'd be curious as well. Agree with hitting it with iron. FEature if you can get it, Ironite if you can't. I don't think too much nitrogen would cause it.

Centipede does pretty well with Milorganite too.

I have a Milorganite app scheduled for June.

 

If you get the milorganite with iron in it, you could do an app in April and May too

 

If you get the milorganite with iron in it, you could do an app in April and May too

If I were to do that I'd have to cut back on my yearly N application from other sources so as not to exceed my target of 2#/1K/yr.
BTW I see that iron in Milorganite has been cut from 4% to 2.5%.

 

N guidelines are keep adding N until it's green or loaded with fungus, then apply fungicide



*** edited meant to say N

 

Wouldn't Milorganite be bad for Centipede since it has Phosphorus in it? It would seem counter productive to me.

 

From what I've learned centipede does not like phosphorus unless a soil test indicates a deficiency and most fertilizers marketed toward centipede have little to no phosphorus. I also have a patch of lime yellow centipede that's near the driveway (could be car washing chemicals) and also near a downspout, which could affect that area also with holding nutrients?

 

Have you checked pH? Concrete is alkaline, and can impact the soil around it. Same goes for OP. Might be you need sulfur. You can apply all the iron you want, but acidity makes it more available, and centipede loves a 5.5-6.0 pH

 

Wouldn't Milorganite be bad for Centipede since it has Phosphorus in it? It would seem counter productive to me.

I believe you are correct now that I think about it. My soil test last month indicates my phosphorus is 'sufficient/high'. Doesn't seem that I should be adding any.

 

Have you checked pH? Concrete is alkaline, and can impact the soil around it. Same goes for OP. Might be you need sulfur. You can apply all the iron you want, but acidity makes it more available, and centipede loves a 5.5-6.0 pH

My soil test indicates PH of 6.0. Supposed to be a good level for centipede I think. No amendments were recommended by the soil test anyway.

 

I just know that Centipede does not like phosphorus and it can harm it.

https://hgic.clemson.edu/factsheet/centipedegrass-maintenance-calendar/

 

I just know that Centipede does not like phosphorus and it can harm it.

https://hgic.clemson.edu/factsheet/centipedegrass-maintenance-calendar/

I don't think milorganite would be bad for it, not sure how much phosphorus is in it, or his soil, or exactly how sensitive it is

 

Have you checked pH? Concrete is alkaline, and can impact the soil around it. Same goes for OP. Might be you need sulfur. You can apply all the iron you want, but acidity makes it more available, and centipede loves a 5.5-6.0 pH

My soil test indicates PH of 6.0. Supposed to be a good level for centipede I think. No amendments were recommended by the soil test anyway.

In that case, i suggest you do iron and nothing else. Nothing. Less is more. If you feed it, weeds and other grasses will take off on you and actually compound the problem. Can you confirm that those yellow spots are not low spots - indicating poor drainage? If this is the case, simply not watering and allowing the areas to dry will help.