Question
Hi,

I have Kentucky blue grass (in Denver).  most of the lawn is light green, but the new sod that I planted last year is nice and deep green.  I added some 21% nitrogen last week, but it is still lighter than the sod areas.  I'd like them to match.  any suggestions?

Thanks,

Kevin

Answer
Your older grass needs iron. Vegetation will turn a lighter green, and as it gets lower on iron, it turns a yellowish color. The grass will look healthy otherwise, just pale.
I like chelated iron in a solid form, like a granule or powderyish. Liquid is ok, and will give the same results, but where it hits the vegetation, it will turn it blackish.That is just a coloring, like if you sprayed dye on it, and after a couple of mowings, when all the blades grow enough to get all that it hit cut off, it looks like you have a major fungus or something. the liquid won't hurt it, but it will look like a dire disease.LOL
You put the iron, water it in well, and you will notice the difference in a very short time, uaually a day or two.
When the leves of any plant get low on iron,the paler color is the first thing you notice, and it gets lighter and lighter, as the iron gets lower.If you put iron on the newly sodded grass that is daker, it will get darker still.
A lawn or garden can scare a gr\ardener as bad as your kids when they are little.
Every time something would go not so right with my yard and garden, I would almost stay up at night, like I did when the first child sniffled.
Now, I don't panic. Like you learn to not get panicky with a slight temp in a child, you will learn to lay back and calmly annalize your lawn's problems.
Only three things ever sent me into walking the floor worry. My children, my animals, and my plants.LOL
If you feel I can ever help you with anything, please feel free to write, anytime.
charlotte