Compaction again??

I talked to a guy today who was more than satisfied with his yields. He adds to my ammunition concerning this years' disappointing yields. I think the culprit is compaction. People who have had good yields have put air into the soil either with tillage or drainage. Soils that have low clay content in the subsoil are also doing well. See a pattern?

Prairie Farmer discusses compaction issues this month.

http://magissues.farmprogress.com/PRA/PF09Sep10/pra051.pdf