[andrews29]

I planted a new lawn out of blue grass sod that was from a sod farm literally 2 miles from my house. It was planted mid April. It got very thick and a beautiful dark green. We fertilized it in may at the recommendation of the sod farm it did great ! However 2 weeks ago I started having a single area turn a lime green the local garden center recommended I fertilize a week early so I did. ( fertalome with iron) now this lime green color is spreading through out my yard. Ideas ?

 

[g-man]

Before placing the sod, did someone apply round up to kill the previous lawn?

 

[andrews29]

No it was pretty much bare ground. What little grass was there I dug up before Rototilling

 

[Turfguy93]

Looks like chlorosis, I'd say nitrogen deficiency or iron. How many lbs of N have you applied to the new lawn? How much have you been watering? Is the soil soggy?

 

[andrews29]

When I put down the sod I put down fertilome new lawn as directed. Since then it has had two feedings of the fertilome with iron which is 24-0-4 as directed. So each feeding has been 10 pounds to cover 2500 sq feet. As for water we are from southern Colorado we are super dry (humidity in the low teens) and hot so we water every morning gets between 1/4 to 1/2 inch a day. Ground is dry by night time. It started in the corner of the yard and is now spread through out 3/4 of the yard

 

[Turfguy93]

Could be bacterial wilt or etiolated tiller syndrome but that's extremely unlikely. Maybe high PH locking up the iron

 

[Green]

What about herbicides? None used?

 

[andrews29]

Turfguy after looking it up I think it could be lack of iron. Every time I fertilize it looks a little better for a couple days then worse. The fertilizer I'm using does have a small amount of iron so that makes sense. No herbicide has been used

 

[g-man]

One other possibility is too much grow. How does it look when you mow it? Lastly, if the grass was using the iron available from the sod soil, and now is trying to use the iron available from your soil, it might turn yellow if it is deficient.

 

[Turfguy93]

Apply a good chelated iron or micro nutrient package foliar and see if it greens up any, but leave a strip unsprayed as a check plot

 

[Delmarva Keith]

If N increases the yellowish but the turf looks otherwise healthy, it's almost certainly iron deficiency. Classic symptom.

What is your ph?

 

[andrews29]

I unfortunately don't know my PH I will be sending off a soil sample. Would there be in risks with trying iron on it ?

 

[andrews29]

Also how long will it take to see a change if it is an iron problem

 

[Greenrebellion]

Also how long will it take to see a change if it is an iron problem

Foliar iron would be almost immediate but the improvement would be temporary (i.e. need to re-apply every few weeks)

 

[Turfguy93]

It should be pretty quick, like within 4 hours

 

[andrews29]

So my local garden center sold me this. After talking they agree its iron problem said it's fairly common where i live. Numbers are 8-16-20

 

[andrews29]

How heavy should I water after application

 

[jimmy]

I don't irrigate my lawn, but watering every morning seems like too much. I think the general recommendation is 1-1.5" per week...watering 2-3 times per week max. (Those with irrigation systems can correct me if I'm wrong.) I'm wondering if the over-watering is why your nutrient levels are messed up.

 

[g-man]

So, if the pH of your soil is above 7, then the iron in the bag will not help you. Iron is soil available when the pH is above 7. For pH above 7, you can spray the iron in liquid form to the leaves or use a cheleted iron source.

One item do be careful is concrete surfaces. They will stain if you dont clean the them before them getting wet.

 

[andrews29]

Sorry I don't know what the difference is between this iron and cheleted iron. So since I don't know the PH should I take this back and find something else ?