Drill Selection for Seeding Wheat After Herbicide Incorporation

ABSTRACT Four grain drills, a hoe drill with split vee press wheels, a double disc drill with split vee press wheels, and a double disc drill with narrow semi-pneumatic press wheels equipped with and without knife coverers were evaluated to determine if they could provide placement selectivity for wheat in soils where trifluralin or triallate has been incorporated. Placement selectivity is the placement of the crop seed relative to the herbicide in such a manner as to reduce injury to the seedling. Placement selectivity provided by the hoe drill was adequate to permit use of these herbicides for cheat {Bromus secalinus L.) control. The hoe drill with split vee press wheels generally provided the highest wheat stands, yields, and lowest dockage. Stands, yields, and dockage of wheat seeded by the double disc drill with narrow press wheels and no coverers and double disc drill with vee press wheels equaled the hoe drill at some locations. At one location, covering knives reduced wheat stands and grain yield..