Interest in subsoiling comes and goes. But studies in three midwestern states show that deep tillage and deep fertilization seldom pay as compared with good fertility and management practices at usual plow depths.
Larson, W. E.; Lovely, W. G.; and Jamison, V. C.
"Subsoiling Doesn't Pay in the Midwest,"
Iowa Farm Science: Vol. 15
, Article 3.
Available at: http://lib.dr.iastate.edu/farmscience/vol15/iss7/3