Southeast Minnesota soybean harvest underway

Farmers have grain to sell

Lisa Behnken is a crops specialist with the University of Minnesota Extension office in Rochester.

It’s official. Soybean harvest is underway as farmers are bringing in the first soybeans of the season. While the growing season was difficult, early soybean harvest results are described as “pretty good, all things considered.”

Lisa Behnken is a University of Minnesota Extension Educator in the Rochester office. She said things really got going around the middle of last week and continued through the weekend before rain settled in. Some of the early reports are saying yields are coming in right around 55 bushels-per-acre, roughly ten bushels lower than farmers harvested in 2016.

“Farmers may have pockets that are doing a little better than that,” she said, “which is normally the case, but when they look at field averages, some are saying closer to 60 and some say closer to 50. That’s a respectable yield. It’s not a bin-buster but it’s a respectable yield.”

It’s respectable, especially when you look back at some of the challenges in soybean fields around the area. Farmers saw a few pockets of white mold in certain fields. Periodic cooler weather and excessive rainfall made it hard to just get the beans in the ground on time. Insect pressure was hit-and-miss. Beans didn’t suffer any drought-stress this year, but, the biggest challenge they did face was weed pressure.

Soybean harvest

Soybean harvest is always a challenging time of year but southeast MN soybean fields struggled with weed pressure, thanks to cold and wet weather limiting the timing and effectiveness of herbicide applications in the spring.

“Cool and wet weather at the beginning of the growing season made it difficult for the herbicides to even activate,” she said, “so some of the weeds escaped control early in the season. If farmers have to chase weed control through the summer, it gets pretty tough. Unfortunately, by the time we got to August, there were a lot of messy soybean fields with a lot of Waterhemp and Giant Ragweed in them.”

The weather made herbicide applications difficult to get down on time in the spring. Farmers are also dealing with increasing weed resistance to herbicides. When weed density gets high in bean fields, that affects yield negatively. Behnken said weed pressure was likely the number one story in southeast Minnesota soybean fields.

Houston and Fillmore County Extension Educator Michael Cruse said soybeans are coming out in those areas as well. While there are still some soybean fields turning brown, quite a bit of beans are already out of their fields.

“With the (up until recently) dry conditions, soybean fields dried out quickly and things progressed to the point where they were ready to come out,” he said. “Soybean harvest is officially off and running.”

While there aren’t a lot of hard numbers coming into his office yet in terms of yield estimates, Cruse echoed Behnken when he said early numbers say yields won’t be as low as some may have thought coming into harvest. Early-weed control challenges and an inability to apply herbicides on time will be the biggest factor in possible yield loss.

Here’s the conversation with Behnken:

 

SE Minnesota Crops Progressing

It’s a bit of a good news/bad news story when you talk about crops progressing in southeastern Minnesota.

When you look at the overall picture, the corn crop is said to be looking good. However, Lisa Behnken, Crop Educator for the University of Minnesota Extension Office in Rochester, said the soybean crop is facing some challenges that may or may not put a dent in the area’s harvest.

Lisa Behnken of the University of Minnesota Extension Service in Rochester, Minnesota (Photo from Extension website http://r.umn.edu/academics-research/extension/staff/UMR_EXTENSION_STAFF_L_BEHNKEN.html)

Lisa Behnken of the University of Minnesota Extension Service in Rochester, Minnesota (Photo from Extension website http://r.umn.edu/academics-research/extension/staff/UMR_EXTENSION_STAFF_L_BEHNKEN.html)

“Corn is looking very good across the area,” said Behnken. “That’s the crop that’s probably outstanding. The general region had good planting dates and some very timely rains in most of southeast Minnesota. It has been a little bit wet in certain areas, and some spots did see some hail. Overall, the corn crop looks good and has had a very good growing season.”

Soybeans are a different story. She said the soybeans have had a rougher go of it.

“And they may even have a rougher go between now and the end,” said Behnken. “There are some fields that look beautiful, but there are some different things happening in area fields. Some of it has to do with the amount of moisture we’ve received. In some cases, it’s been too much moisture, and that’s led to some problems for bean here in late August, into early September.”

Weeds are becoming a big challenge in area soybean fields.

“You have some fields that are very clean,” said Behnken, “with maybe a corn spear or weed here and there. On the other side of the equation, we have a lot of fields with Waterhemp coming through in soybeans. In other cases, you may see giant Ragweed, or even a mixture of weeds like Velvetleaf and Lamb’s Quarter, but the big one people are talking about here, and around the state, is Waterhemp.”

So, why is Waterhemp a problem?

“It germinates a little later in the spring,” said Behnken, “but it can germinate all through the growing season. When the canopy doesn’t close right away, the weed will keep germinating through the season.”

Behnken has a theory on why soybean canopies are closing later than they have in the past. She called it a Catch-22:

 

The bigger question is what a farmer did early in the season to treat fields for weed development.

“What did people do for their herbicide program,” said Behnken. “If you did not use a residual herbicide in your pre-emergence program, or in some cases, come back with a residual in your post-emergence program to keep those herbicides working all season, then Waterhemp has an opportunity to take off.”

Waterhemp

According to Lisa Behnken of the University of Minnesota Extension Service, Waterhemp is becoming a challenge in SE MN Soybean fields. (Photo from soilcropandmore.info)

She added, “We’re also talking about resistance issue now. Waterhemp has some resistance to the ALS chemistry, and we’ve just confirmed some resistant pockets to another class of chemistry we call PPO’s.”

Area soybeans are struggling with some disease pressure as well.

“One that’s difficult to manage is white mold,” said Behnken. “I see it going east of Rochester throughout eastern Olmsted County including Winona and Wabasha and even into Fillmore County. If you notice uneven canopy development and walk out into the field, you should see some white mold. White mold likes wet conditions, and east of Rochester saw quite a bit of steady rain.”

Behnken added, “It’s a very difficult disease to treat, and while fungicides control other diseases in soybeans, there are more limited options to take care of white mold. It’s definitely going to cost some yield in certain fields.”

Bean challenges don’t stop there.

“We always wonder when aphids will hit us, and this year they hit us in August again,” she said. “The weather earlier this year kept them at bay. Toward the end of July, we saw a mass migration when aphids came in on westerly winds. Once they arrived and got established, they exploded in numbers really fast. Growers need to keep a sharp eye on their fields.”

The area’s alfalfa crop has turned out well in spite of frequent early season rains.

“We’ve put up a lot of hay this year,” said Behnken, “mostly in between rain storms. The good part of it is if you do have rain, then you have a crop. We know how to deal with hay that gets rained. We chop a lot more hay and we round bale, then you categorize it based on quality and how much rain damage there is. We’ve put up a good crop, so there’s good feed out there.”

If it’s been awhile since you’ve seen white mold in your fields, here’s a good refresher at spotting white mold in soybeans, courtesy of the University of Wisconsin Extension Service: