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| I process lots of acres of both soil sampling and yield data every year, (Over 30,000 acres yearly). And I can tell you for the most part your low yielding areas are your highest fertility areas due to no removal. In most low yielding areas fertility is not your limiting factor, it's the ground itself.
I would cut back your rates on your low yielding areas as well as population, no reason treating an area that will only max out at say 140 bu. corn like a 200 bu area. As you run through more data and analyze it you will really start to see the zones within the field and be able to manage these areas differently.
On my dad and I's ground we have been using the same zones for the last 8 years for VRT P & K and micros, and now are going to be starting cutting our population in low yielding areas and increasing it in high yielding with VRT planting. I don't view VRT as a money sover more as a more efficient way to use your inputs.
Hope this helps
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Integrating grid sampling with yield data?
