Wk. Vencill et Pa. Banks, EFFECTS OF TILLAGE SYSTEMS AND WEED MANAGEMENT ON WEED POPULATIONS INGRAIN-SORGHUM (SORGHUM-BICOLOR), Weed science, 42(4), 1994, pp. 541-547
Field research was conducted from 1987 to 1991 to evaluate the influen
ce of four weed management systems on weed population and species dyna
mics in conventional-tillage and no-tillage grain sorghum production.
These weed management systems included zero, low, medium, and high inp
ut systems. The weed seedbank increased faster in zero and low input w
eed management systems than in the high input weed management systems
because of differences in weed control. Tillage influenced weed seed d
ensities as well. Common ragweed, common lambsquarters, horseweed, and
sicklepod seed densities often were greater in no-tillage than conven
tional-tillage plots. Common cocklebur and large crabgrass seed densit
ies were usually greater in conventional-tillage than no-tillage plots
. Smooth pigweed seed densities were not affected by tillage. Increasi
ng weed management inputs diminished differences between tillage syste
ms. Smooth pigweed dominated the weed populations after 4 yr in both t
illage systems even in high input systems.