Home Farm Equipment Drought challenges PRE, POST weed treatments

Drought challenges PRE, POST weed treatments


Drought circumstances complicate sorghum preemergence (PRE) and postemergence (POST) herbicide purposes. As drought persists within the Southwest, Sorghum Checkoff Agronomist Brent Bean says there are necessary administration ideas producers want to contemplate earlier than treating their fields.

“Drought conditions tend to make weed control a challenge with both PRE and POST-applied herbicides,” Bean says. “In sorghum, growers especially rely on good preemergence weed control.”

For pre-applied herbicides to be efficient, Bean suggests the next:

1)  The herbicide have to be moved into the soil in shut proximity to the weed seed. Though this may be achieved by tillage, producers are largely reliant on rainfall or irrigation to put the herbicide within the soil weed seed zone. How a lot rainfall is required? Normally between 0.25 and 0.5 inches are required, relying on a few of the elements listed in #2.

2)  Sufficient herbicide should stay within the soil water to kill the germinating weed. That is depending on the next:

a. Solubility of herbicide in water.

b. Quantity of soil water current. The wetter the soil, the extra herbicide can be current to be taken up by the germinating weed.

c.  Affinity of herbicide for being absorbed into the soil. This can differ by herbicide. Weeds don’t take up herbicide absorbed to the soil. On the whole, soils with greater pH, CEC, natural matter and clay content material will soak up extra herbicide, which is why elevated herbicide charges are beneficial in these soils.

To extend PRE management throughout a drought, Bean recommends the next:

  1. Use the very best labeled charge. The upper the speed, the higher the chance for sufficient herbicide to be within the soil answer to be efficient below drier circumstances.
  2. Attempt to time planting and pre-application simply previous to rainfall. ” I know, easier said than done!”
  3. Take into account mild tillage to include the herbicide if rainfall will not be obtained inside a couple of days after utility. The longer the herbicide stays on the soil floor, the extra it probably degrades and in some unspecified time in the future is not going to be efficient, even after a rainfall occasion.
  4. Take into account re-applying the pre herbicide as a put up utility if circumstances stay dry. Nearly all the PRE herbicides utilized in sorghum are labeled and protected for POST utility. Test label.
  5. Choose a herbicide that’s extra energetic below drier circumstances. Though S-metolachlor, bought below a number of commerce names and in pre-mixes with atrazine, is a good PRE herbicide there’s proof that each acetochlor (Warrant, Fultime NXT, others) and dimethenamid (Outlook, Verdict, others) could also be more practical below drier circumstances.

For extra data, assessment Absorption of Soil-Applied Herbicides by Iowa State Extension Weed Scientist, Bob Hartzer.

POST Weed Management

Weeds rising in drought circumstances sometimes have a thicker waxy cuticle on the leaves that have to be overcome by the herbicide, Bean says. Additionally, burdened weeds have a lowered development charge and translocation slows, lowering the motion of herbicide to the place it could possibly trigger essentially the most harm (site-of-action) inside the plant, he provides.

Bean recommends producers take the next actions to extend POST weed management success throughout a drought:

  • Use the very best labeled herbicide charge
  • Good protection is crucial
  • Deal with small weeds. We at all times discuss concerning the significance of weed dimension for optimum management, however it’s much more necessary for the management of burdened weeds.
  • Use beneficial good high quality adjuvants. Take into account including fertilizer – AMS, UAN, and so forth, when applicable (see label).
  • Reap the benefits of any rainfall occasion to use herbicides to weeds which are actively rising.
  • Take into account contact herbicides. Drought stress impacts the efficiency of translocated herbicides extra so than contact herbicides. Examples of contact herbicides that can be utilized in sorghum are Intention and Buctril. Perhaps tank combine these with different POST herbicides.



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