Same here for the most part, We've been 100% no til since the late '70's until a recent bit of experimentation. But as one of those experiments this past year we used a strip till unit on half of an 80 acre field we've farmed since the '50's. Put P and K down 8" to 10". Had best yields ever this past fall (due to many conditions, mostly great weather) . Parts of the field where we did NOT use strip till averaged just over 210. Areas where we DID put the fertility down deep went almost 240. Even with that, I'd want to see more data over a wider array of condition before I'd say the strip tilling was the only force at play here.
Also worth considering, a field that you've surface applied fertility for 35 years or more, you'll have SOME leaching and have SOME fertility work it's way down, even without tillage of any sort. A "new field" that hasn't had much attention, and may or may NOT be soil conducive to fertility movement in the first place probably won't have much P show up below surface. Lot of variables...
Bottom line, a new field that is P deficient going in would see FAR better results by placing P in root zone. (along with looking at conditions where P is tied up in clay soils. Just because you put it there doesn't mean it will always be available to the crop)
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