Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: June 30, 1999
Publication Date: N/A
Technical Abstract: We evaluated cone indices for a double-cropped, deep-tilled management system in large field plots. Soybean and wheat were drilled in 20-cm row widths using disked or no surface tillage and paratilled or no deep tillage with an extra set of deep-tilled treatments rotated with in-row subsoiled corn. Cone index was higher for soils with shallower B horizons. As a result of plant growth and drier soil, cone index was higher for subsoiled than paratilled treatments. When compared to non-disked treatments, disked treatments had equal or higher mean profile cone indices even if treatments were deep tilled. Deep tillage with a subsoiler or a paratill does not completely relieve compaction by previous surface tillage with a disk harrow.