Home Farm Equipment Leaving volunteer corn too long impacts soybeans

Leaving volunteer corn too long impacts soybeans


Volunteer corn gave the impression to be an even bigger drawback than traditional in lots of cornfields throughout the Corn Belt in 2021. Many vegetation grew from particular person kernels as a substitute of complete ears as a result of they tended to be scattered slightly than rising in clumps.

“We advise including a herbicide to take out volunteer corn early if you have that issue,” says Steve Gauck, a regional agronomy supervisor for Beck’s, primarily based close to Greensburg, Ind. Beck’s sponsors Soybean Watch ’21.

Associated: Early weather stress shows from above in soybeans

Gauck notes that except you develop non-GMO corn, glyphosate doubtless received’t kill volunteer corn. The volunteer corn vegetation will doubtless even be immune to glyphosate if the guardian vegetation carried the trait. The identical factor applies to spraying them with glufosinate if the guardian was a LibertyLink hybrid. For those who’re going after volunteer corn with a postemergence software, it could require including a herbicide that may remove the corn, it doesn’t matter what traits it comprises.

Spray early

The essential factor is to make that software early within the season in case you have volunteer corn vegetation exhibiting up in soybeans, Gauck says. It’s greater than only a matter of ugly volunteer corn within the area. And the principle risk is just not that volunteers will produce ears that lead to scattered corn kernels within the semiload of beans. That may occur, however the true drawback is a matter of the competitors they pose to soybean vegetation early within the season.

“The soybean considers any plant competition, including volunteer corn plants, not just things we recognize as weeds,” Gauck explains. “My advice is always to start with a residual herbicide and then spray early to get weed escapes. The longer any plant grows next to a soybean plant, the greater the chance that that soybean plant will produce fewer pods and beans.”

This volunteer corn was sprayed late and seems to nonetheless be alive. Nonetheless, the middle of the stem is lifeless. It’s going to die, however it offered early competitors to soybeans.

One main motive is as a result of competitors could cause the soybean plant to not ship out a further department subsequent to the place the corn plant is. In early August, Gauck demonstrated the idea within the Soybean Watch ’21 area by pulling up a soybean plant subsequent to a volunteer corn plant. The soybean plant didn’t have branching on the facet nearest the volunteer cornstalk.

“Fewer branches usually mean fewer pods produced,” Gauck says. “We get yield from having more nodes, more pods and more total beans per acre. If a branch doesn’t form on one side of the soybean plant because a corn plant was there, it means you will likely have fewer total pods on the plant.”

On this case, the volunteer corn was sprayed, however late within the spraying season. Gauck pulled a number of stalks and confirmed that the rising factors have been lifeless. “Unfortunately, some damage was already done,” he concludes.


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