A bit hard to read your photo but it looks like that place with "Iowa's Best Burger" is in Storm Lake. Definitely a stop next time I'm out in that direction!  The best burger in our small town is also a CHB burger at a newer local tavern.

I don't usually fertilize pastures. I have been making all of my own winter hay for the past couple years.  While I try to graze each hay field at least once each year, they don't get nearly enough manure to offset the good mixed hay I bale off of them.  The way I winter graze in sacrifice pastures I also don't have much manure to spread back on the hay fields.

This year I did some soil tests on my hay fields and did apply fertilizer per the soil test recommendations for mix grass/legume hay.  The small field pictured above is one I usually take hay off of so it did get 0-0-60 and DAP spread to soil test recs earlier this spring during a dry stretch. That fertilizer along with a lot of rain on this south facing slope are sure producing a lot of early grazing.

As much rain as we've been getting, the field is getting a bit pugged up by all the hoof action as you can see in the picture.  However in this situation I think that can be actually a good thing in Allan Savory style as long as I get them off of it soon and let the field recover during the peak growth period.