Pre-Emerge Applications are the “Best Recommendation”

Jan 24, 2022

Soybeans without pre-emerge herbicide application
In an unpredictable supply market, pre-emerge herbicides on soybeans can help protect yield potential by addressing critical factors:
  • The weeds are already in the soil, waiting to compete for the sun, water, and nutrients the soybeans need. Pre-emerge herbicides “can reduce the weed seed bank in the soil,” said Craig Loen, Federated agronomist at the Osceola location.
  • Weeds underground are “easier to terminate; they only have one growing point,” said Loen. Once they emerge – especially a resistant weed like waterhemp – the weeds have multiple growing points that make them harder to terminate or control.
  • Small, germinating weeds can be eliminated by a good pre-emerge herbicide, and then, “the next flush of weeds will be similar in size, making the post application more effective,” he said.
  • Resistant weeds (e.g., waterhemp and giant ragweed) have less chance of survival with a good pre-emergence herbicide plan. 
So, what does a good herbicide plan include?
  • Timely application. Some pre-emerge herbicides need to be applied within three days of planting because the “bean seeds can’t be exposed,” said Loen. Row closure is critical; seeds can’t be cracking the surface of the soil. If the herbicide comes in contact with the seed, it can kill the germ.
  • Effective layering of residual herbicides.
  • Multiple modes of action.
  • “Again,” said Loen, “multiple modes of action.” That is the best recommendation for controlling weeds in soybeans.
  • More than one option. In a tight supply market, you may not be able to get your go-to per-emerge herbicide; you need a plan B. And the weather or schedules might frustrate plans further.
In a year when the usual challenges of farming may be complicated by supply issues, it’s critical to have a well-planned “pre- and post-emerge herbicide program based on your farm’s weed pressures and the availability of herbicides,” said Loen. Your Federated Agronomist is ready to help with those plans. Reach out soon.

Read More News

May 24, 2023
When you care about the land, the environment, and making a living, remember the 4 Rs of nitrogen for your crops.
May 24, 2023
Yield Burst™ Technology can enhance growth and increase yields. Federated Agronomists recommend this technology and its “biostimulant actives,” including amino acids, as part of a strong crop management plan.
May 24, 2023
If you see four-inch weeds when you scout fields in the next few weeks, your window to control them is closing fast! It's time for post-emerge herbicide applications.

Related Topics