With all of the rain that we have gotten lately, many people had already burned down their fields but then were unable to plant. They are now in the situation where they have 2-4 inch weeds, wet fields, and won’t be able to plant for another week. Rain is predicted for next week, so what is the best option.
Herbicide Resistance Info
Obviously, since you are using a burndown, we are talking about a no-till situation so tillage is not an option. Even though it is late for planting, you are still able to plant soybeans and cotton but you don’t want to use a burndown that has a plantback time. The best option at this point would be to apply another burndown of Gramoxone.
The best time to apply Gramoxone is either early in the morning or right before the sun goes down. We (Larry Steckle, Garrett Montgomery (The University of Tennessee) and I) conducted a study for two years on the time of day effect on different herbicides. We determined that gramoxone controlled horseweed 85% when sprayed at sunrise, 59% when applied at noon, and 92% when applied at sunset. There was no difference between the sunrise and sunset applications but we deterimined that when the gramoxone is applied during the middle of the day it is burning the plant so quickly that it doesn’t have time to kill the plant.
With this option, you don’t have to worry about waiting for a plantback time or for the weeds to die. They will die within 24-36 hours and you will be ready to plant as long as you can get in the field.