Marv,

I carefully looked over your responses and I think basically we agree we each other.  The pivot track example was not to try and apply through that but rather yield data does a good job of describing relative differences but not necessarily absolute values.

On the flip side of high resolution application is the application approach that has just a few values and those areas are much larger than say the 90 foot width you gave as an example.  Surely when appropriate, application prescriptions can be better than multiple 100 feet areas and especially if yield data is utilized in the process.

Thanks,

Arnie