I'm up in Northern MN, zone 3a, Koochiching County. My soil is not good, but improving. I started with a PH of 5.2, and "very low" in everything it measured. This is my third year on this plot. The first year, I just planted WR and poured 300LB/acre fo 19-19-19. The second year, started with the pell lime, etc.... Late Spring this year I sprayed, spread more lime and gypsum, then broadcast oats, very heavy. I spread ~200LBS an acre of VNS oats from the local Co Op. At the beginning of July the entire 2 acre skinny snake plot looked like this.
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In that same first week of July I sprayed with 1qt/acre gly and AMS then broadcast my brassica mix of PPT, DER, Radish, Kohlrabi, Winfred Brassica along with a few pounds of Fixation Balansa clover. I fertilized to the soil test. I followed up by running the oats over and laying it down on top of the seed. For nearly a month we had very little rain, then the first week of August we started getting some regular rain. This is what it looks like now.
Looking South
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This stuff works.