Milorganite is great for high pH soils. Considered organically chelated iron. You can also do foliar sprays but that gets old as it must be done frequently. I'd keep using it as much as possible. As above, try to source potassium sulfate. I can't find it locally so just use KCl but as long as rain is plentiful the salts should leach out of the soil so as not to be problematic. That usually means applications in the fall and spring, not summer.

If you do use KCl (potassium chloride), limit use to about 1-2 pounds per thousand square feet per month if you irrigate or it rains (and not in summer, please!)

I don't hate the stuff, but it's pretty harsh. I'd really rather see you use potassium sulfate (sulfate of potash).

All, thanks for the suggestions!

So it sounds like the first one would be the better option being that the salt index is 22 and that its sulfate of potash?

I'm just trying to use an alternative to the Scott's Fertilizer that is readily available to deliver iron, nitrogen and potash. The two above are the ones I selected from a local landscape supply house.

I used the product at the link a couple weeks ago along with Milorganite 4 weeks ago. Then got 6" of rain over the last couple weeks. What a blessing as the last two summers and early falls have been terrible. My lawn finally looks decent after 2.5 years. Areas that weren't compacted and are in an ever so slight swale with deep soil looked good the first fall and never looked bad. Other areas that were disturbed, have more sand and compacted has look thin, lacked vigor and poor color.

https://pndata.andersonsinc.com/Files/Labels/APT21NFE5.40-K16%20-%2011x17.pdf

dchall,

its definitely compacted in some areas. It was a new build 2.5 years ago plus I planted 100+ plants in the yard already.

I have absolutely no objection to the Anderson product at about 5 pounds per thousand square feet in September and October.

Don't bother with it as a winterizer, though, as it's the wrong time to add potassium. But if you do, K isn't a listed water pollutant (there's boat-tons of potassium in water already), although it won't do much good before ground freeze and the chances of runoff are much greater if it's near the surface close to winter.

I originally went with the Anderson product as it was the best bang for the buck. It's like $22 for 50 lb bag.

I have over an acre to fertilize

Then by all means, use it! It looks like perfectly good stuff.

K isn't an element I worry overmuch about overapplying (iron is the other one). There's an enormous window of acceptable values, excessive soil amounts have few to no consequences, and potassium runoff isn't a water pollutant. This is pretty much the one time I'll be OK with a few applications even without seeing the soil test.