How many pounds are you planting to get that yield?
About 15-20 pounds, with 2-several seed pieces per seed potato. Yukon Golds—poor yielder for us, but we love’m); and Red Pontiacs and Norkotah russets...both big yielders of baking size.
We buy the certfied seed potatoes at a local market that gets them in bulk from either MN or MI, and sells them for $0.59/pound. Beats the heck out of mail order prices or the garden store bags of 2 lbs for $7.50.
I deep-till in 10-10-10, then put the furrower on the tiller to make my trenches. I then use ~1 cup/100’ of row of triple-superphosphate about 1-2” below the seed pieces.
I use the furrower to hill them, and that leaves a deep irrigation trench on each side of the rows.