Fertilizing my 5,000 square feet of Kentucky Blue Grass

Asked September 24, 2019, 8:52 PM EDT

We had a new lawn professionally installed in June of 2017. It is Bluegrass sod from Green Valley Sod that is called RTF water saver sod. I just had it professionally aerated and was told to wait until late October to fertilize. The fertilizer I bough, also from Green Valley, is called slow release with 20-5-5+iron. The aerator talked about so much nitrogen, the first number, should be put down - he understood what he was saying but he did not communicate what he was saying very well to me. Can you tell me how much of this 65lb bag I should be putting down? He told me that I have spots that have the round disease so be careful not to put the fertilizer down to early in the spring-wait until late May.

Douglas County Colorado

1 Response


I am sending you two fact sheets on turf management; both include fertilization timing and application tables. The general application rate for nitrogen is 1 pound of nitrogen per 1000 sq. feet of turf.

Hopefully, these fact sheets are understandable for you. If not, you may want to call our office directly and speak to a Master Gardener who would be happy to explain the application rates. We can be reached at 720-733-6935 from 9 a.m. to noon and from 1 to 4 p.m.

https://cmg.extension.colostate.edu/Gardennotes/551.pdf
https://extension.colostate.edu/docs/pubs/garden/07202.pdf