Few other problems have been reported in the state. Some fields with frost heaved wheat will show signs of plant death as the soils continue to dry. The new root systems of heaved plants are not able to support the quickly growing tillers when soil moisture is limited. The rotary hoe provides little incorporation of herbicide, but can effectively eliminate those weeds that are starting to emerge. This may be as early as 3 to 7 days after planting, depending upon date of planting.
Weeds germinate and emerge more rapidly at later planting dates.
A second rotary hoeing 5 to 7 days after the first will improve control, and may be necessary if rainfall continues to be lacking. Once weeds can be seen, they are probably past the stage of maximum rotary hoe effectiveness, especially large-seeded weeds such as velvetleaf and giant ragweed. The rotary hoe is most effective when the soil surface is smooth, dry, and firm, or where a crust is present. Rain shortly before or after rotary hoeing can greatly reduce effectiveness. For best results, operate the hoe in the same direction as crop rows at a minimum speed of 6 mph.