thanks for the great info!

Any issue with sticking with TSP (0-46-0) for P? So I can use just do moderate N feedings with milo/corn - while still moving P and K numbers, without mowing twice a week... lol

I plan to keep up the organics (milo and corn) for the slow release NPK and iron (along with the TSP and SOP), but also to help add to the 'composting' action of the yard with grass clippings. Also to help maybe with a little natural disease control.

Curious on the Epsom, why hold off until end of the season? Is it a little rough on grass and/or soil-life...better on 'dormant' grass?

I am wondering if the higher OM number is due to root shedding of the sod...? interested to see what comes of that number next year and after... hopefully things stay up.

You can use TSP if you want. In place of the starter, apply that at 2.2 pounds per thousand square feet instead.

I moved the Epsom to accommodate other, more important things. You're not that short, 8.4% isn't even close to deficiency. In this case, I'm just correcting the soil and I doubt you'll see any impact from that application. However, we don't want the number to slide in the future, so we correct it now.

OM numbers can certainly move around a lot, particularly in sandier soils. Newer sod actually isn't a strong OM producer--established lawns are far better at it--but it can help. You may simply be lucky and have a naturally higher OM soil!

Curious - in a recent Milo thread (with jackie chan MEME) - you mentioned...
Exception: Severe shortages often mean the impact of over application is less than the impact of the severe shortage.

Are my P and/or K(!) in that realm?

When you originally mentioned using a bag rate Starter on the first of the month, and SOP on the 15th... were you assuming that I would be using approx 1.5# of K per k for the month then? Seems many starters are like 15-25-15...bag rate would be around .5# of K? (although k numbers do very greatly). (Scotts for example only has 4% K)

Just want to make sure I'm doing as much as I can before the heat hits - using like I am TSP - it seems like i'm missing out on 30% of planned dosages for the year? I know this soil might be a long journey... but just like all the running I do, you want to make sure you are on the right pace, sooner you are on that pace the better! :)

Your P is outside the emergency range. K is kind of borderline, but the June 15th shot will raise it from borderline to well outside the emergency range--3 pounds actually is rather a lot so I consider it a minor overapplication.

If P at your pH had been less than 25, I'd be moving into double application. Once. Probably in fall since we're already in June and the weather has already been rather warm. But it's not necessary here.

If you're applying TSP at 2.2 pounds per thousand (give or take), you're well within range of bag rate of starter fertilizer--both will supply right around 1 pound of phosphoric acid equivalent.

Soils are always a long journey. Will we finish with P and K this year? No. But next year's test will be rosier in terms of K, and somewhat rosier in terms of P (which takes forever to perk in). Magnesium should be close to optimal next year. Boron will still require a lot of work, but 0.5 is close enough to optimal (0.7) that I doubt you'll see a huge difference.

I was pretty diligent throughout last year putting down roughly 1# of P & K monthly - micro's I was probably at half doseage. Just was tough to get my powder/milo mix right... too wet... too dry... etc. So ended ... "thats good enough" most of the time.

I didn't get an updated test, wife was giving me hell ("grass is green enough"...) and from the sounds of it the situation is going to be a long term proposition getting the P/K up.

See any reason to deviate from the plan this summer on the TSP/SOP? Still likely a bit more Boron/Copper due to the reduced rates last year (likely will be at half rate per app....if history repeats...)?

THANKS!

With as short as you were in terms of phosphorus, I had planned this to take two years anyway. Continue, but at half rates. At this point you should be well over 100.

Same with the SOP, but go full rate. That was really low.

Skip boron and copper; they're not something I'd ever add without a modern soil test. Both are extremely touchy in terms of enough/too much, and grasses aren't the most sensitive plants in terms of shortages to either.