Get the most out of new soybean herbicide traits

Soybean herbicide trait packages have changed quite a bit over the past 25 years.

SoybeanHerbicideEach year, MFA agronomists test the latest soybean seed traits at replicated plots throughout the region. No matter what varieties growers choose, however, planning an effective weed-control system is paramount to getting the most out of the technology. In 1996, Monsanto released the Roundup Ready trait, which immediately changed the game for how farmers managed post-emergence weeds. Nearly 15 years later, LibertyLink beans were introduced in 2009, giving producers the ability to spray glufosinate over the top of soybeans to control emerged, hard-to-kill weeds such as pigweed, marestail and morning glory.

The increase of herbicide resistance in weed populations over the past sev­eral years has led to more traits being added to the portfolio. In 2016, Xtend soybeans were introduced, which allowed for approved dicamba chemistries to be sprayed over emerged soybeans. Soon after, Enlist E3 beans were added to the portfolio. This trait meant approved 2,4-D herbicides could be sprayed over the top along with glufosinate. Now, for 2021, the most recent addition is XtendFlex technology to allow for approved dicamba products and glufos­inates to be applied.

There is a common theme among these traits—they’re designed to increase yields by improving crop safety and increasing effectiveness of weed control. With so many choices, how do you decide which one is best to use? For me, the answer is, “It depends.”

When used properly, any of these systems released in the past few years can be used to effectively control weeds. The traits are additional tools in the toolbox that we can use if necessary. 

Your choice in technology depends on several factors, and those factors may vary. That’s why it’s important to not only have a cropping plan but also a detailed, field-by-field cropping plan. The best way to control weeds is to prevent them from ever emerging. It all starts with an early cropping plan to identify the key issues that need to be managed during the growing season. Your local MFA team will work with you to identify your operation’s driver weeds, those that influ­ence yield or long-term weed management goals. Then, our agronomists will put a plan in place to effectively control those weeds. Oftentimes, determining your herbicide program will assist in the seed selection decision.

For example, there is no silver bullet on the market today that will control all of the driver weeds in MFA’s trade territory. Some require year-round management. Again, the easiest way to control weeds is to keep them from coming out of the ground. For weeds such as marestail, this means starting a weed-control program in the fall. The majority of marestail emerge in the fall and bolt in the spring. Once they reach the bolt­ing stage, or stem elongation, controlling them becomes significantly more difficult. An effective fall burndown will keep fields clean through the winter, making spring operations easier with a higher success rate. In a no-till situation, the next herbicide application has the capability of being more effective against smaller and fewer weeds. Even in a conventional-till situation, not having to work the ground as many times for weed con­trol saves time and money on equipment.

Even with all of the herbicide trait packages available today, if weeds are present once the beans emerge, control options are fewer, and significant yield losses are possible. Starting clean and using an effective residual followed by another residual 21 to 28 days later is the preferred method for keeping weeds in check all season long.

Selecting the right seed for the right acre is an important decision, but it is just one of the many decisions for a successful growing season. As a grower, your best investment is to reach out to your local MFA key account manager or MFA agronomist to start working on a cropping plan for next season. The greatest success comes to those who plan early and often. Effective, timely decisions have the highest rate of return. Your local MFA team is ready to take your operation to the next level.

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Seed treatments advance beyond the basics

In recent years, there has been a shift in how soybeans are treated. In the past, if a grower desired a seed treatment, he or she would have a small selection of options to be treated by the seed company, and it was typically delivered to the dealer with the treatment applied.

Now, many input suppliers such as MFA have invested in their own seed treaters. Seed is shipped untreated, and the dealer is responsible for ordering treatments and applying them. There also are many more treatment products available. These changes have made the process of choosing the right seed treatment much more complex.

These days, it’s standard practice to treat soybeans with a basic fungicide for early-season disease protection along with an insecticide to defend against early-season insects. But protection shouldn’t stop there. It’s important to keep in mind additional seed-treatment options for control of soybean cyst nematode (SCN) and sudden death syndrome (SDS) that have come on the market in recent years. Inoculants and other biological products need to be considered as well. Many newer products have mul­tiple active ingredients that cover several of these needs in a single package. While pre-mixed treatments can certainly simplify the selection process, it is important to understand what is in the package compared to the needs of the farm.

Understanding the basics of seed treatment is key to selecting the right product for your farm. There are more active ingredients available now along with blends of mul­tiple active ingredients. Identify the driver pests and the strengths and weaknesses of pest tolerance in the specific variety to be planted. Be aware of possible diseases in the upcoming season that could cause stand and yield losses. Early-season pathogens such as pythium, phytophthora and rhizoctonia can be controlled with seed treatments.

Perhaps the most important factor in controlling these pathogens is ensuring the treatment includes effective rates of an active ingredient or multiple active ingredients to control the targeted diseases. The same is true for choosing the right insecticide component. Insects of concern early in the season are grubs, maggots and the first generation of bean leaf beetles. The treatment you select should contain the right ingredients at the right rates to control these target insects.

Many new treatment products are available for control of SDS and SCN. Field history of these diseases must be considered when deciding whether to use these products. Soil samples can also help determine the presence and potential severity of SCN. Seed-treatment products such as Votivo and Clariva are available for SCN control. Illevo has become popular for control of SDS in recent years. Saltro is another new option for SDS control. MFA agronomists are looking closely at this product to gain better understanding of its efficacy.

Biological products should also be considered in a seed-treatment package. Innoculants con­taining rhizobia, nitrogen-fixing bacteria, have been commonly used for years. These products assist naturally occurring rhizobia in the soil. More recently, products with different microbes have become available. These may assist with root growth and help capture soil nutrients along with other benefits.

Innoculants continue to be improved, but it is important to understand the live and active rhizobia levels in the product to help gauge its effectiveness. When choosing biological seed treatments, first determine if the needs of the farm match up with the benefits that these prod­ucts provide.

At MFA’s crop research sites this year, we are testing several new seed-treatment products and evaluating new active ingredients, blends of ac­tive ingredients and biologicals. We look at these products throughout the season and finish with yield analysis. In our fungicide and insecticide trials, we evaluated soybean stands along with efficacy against driver insects and diseases. In the biological trials, we are determining how these products provide benefits to the soybeans both above and below ground.

Final yield is perhaps the most important aspect of these trials. With this extensive testing, our primary goals are to learn more about the new products available and to use that informa­tion to make the best recommendation for our growers.

With the increasing complexity in making seed-treatment selections, it is good to have expertise backed by research as part of the deci­sion-making process. The choice of seed treat­ment is an important component of your annual cropping plan. MFA’s key account managers, location managers and agronomists are prepared to advise growers in choosing the right products for their farms.

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Widen the window with fall fertilization

Compacted springs are begin­ning to feel like the new normal. Cold, wet weather often gives way just in time to allow a quick win­dow for critical spring operations. Applying fertilizer in the fall allows more of that window to be used for fieldwork and planting. Fall fertiliz­er applications also free up strained infrastructure, allowing more time to stage dry fertilizer and anhydrous ammonia. Additionally, fertilizer prices are often more attractive in the fall.

Typically, anhydrous ammonia is thought of as the problem in logistical bottlenecks. The loss of a pipeline and increased difficulty in securing rail transport have exacer­bated that situation. Few things are more frustrating than watching the planter sit while you wait for tanks or product to fill those tanks. Ap­plying nitrogen in the fall can help alleviate this stress. Some growers are not comfortable with putting all their nitrogen on in the fall, but there are ways to manage those concerns.

One popular strategy is to put one-half to two-thirds of a corn crop’s anticipated nitrogen needs down in the fall with a plan to side-dress or top-dress additional nitrogen during the growing season. This allows planting to start when conditions are favorable, even if spring ammonia supplies are tight. It also allows the final rate to be adjusted in-season based on growing conditions and what kind of weather has occurred since the fall application. MFA’s Nutri-Track N nitrogen-modeling program can be used to determine how much additional N is needed and can even create a variable-rate applica­tion prescription for applying it. Of course, N-Serve is still recommend­ed to hold nitrogen in the stable ammonium form longer.

Dry fertilizer can also be an ob­stacle in the spring. Larger tenders and high-capacity custom-appli­cation trucks create situations in which product leaves fertilizer plants as quickly as it comes in. Ex­ternal factors such as river flooding affect barge traffic and the ability to unload product, tightening these supply situations. Fall application takes pressure off the system, your operation and you. Phosphorus and potassium applied in the fall along with sulfur and zinc will be ready to go to work for you in the spring, and you won’t need to wait when spring weather doesn’t cooperate.

Another management strategy growing in popularity is to fertilize in front of beans, and fall is a good time to do that as well. Growers em­ploying MFA’s Nutri-Track program often apply two years’ worth of fertilizer in front of corn to supply that crop and the following soybean crop. Two-year applications are an­other way to help navigate logistical strains and increase efficiency. In recent years, however, yields have generally exceeded the applied fer­tilizer rates. In some instances, rates applied in front of the corn crop simply need to be increased, but an­other way to address this is to make up the difference in front of the soybean crop. Rather than applying increased rates of fertilizer that as­sume two large crops, growers can maintain their existing program but apply a flat rate of plant nutrients to help make up the difference after harvesting a larger-than-expected corn crop. A flat-rate rig or buggy can be used because soil variability has already been addressed with variable-rate application in front of the corn.

Often overlooked is the impor­tance of fall fertilizer for pastures and hay fields. Phosphorus, potassi­um and even some nitrogen applied in the fall help pastures repair damage incurred during summer grazing and haying and replace nutrients that were removed. Fall fertilizer encourages a denser stand and helps plants get ready for win­ter. A well-fertilized stand will also compete better with weeds and be ready to go in the spring when wet conditions do not allow fertilizer applications at green-up. Growers raising alfalfa should always plan to apply half of that crop’s nutrient removal in the fall. This allows for efficient use of potassium and prepares the crown and roots for winter.

Talk to your local MFA personnel about other strategies you can em­ploy to make fall fertilizer applica­tions work for you.

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Cover crops: Are they a real fix for water quality?

The use of cover crops has been growing over the past decade or so. But, do the benefits to the landscape from using covers in a cash-crop system actually outweigh the risks of changing practices and modifying operations? Cover crops need to pay dividends to both the individual grower and the landscape as a whole. The in-field advantages are much better known and documented than the effects on water quality and how it moves through the agricultural landscape. These landscape-level effects are critical in telling the story of mod­ern agriculture and how we are able to maintain top production while making positive steps in reducing the amount of agricultural inputs to surface waters.

To be successful in this quest, cover crops should decrease total water volume, suspended solids or soil leaving the field, and total phosphorus (P) and/or nitrates (N). The first two of these need to be measured, but we can make some educated assumptions when it comes to total water volume and soil loss. Cover crops increase surface cover and keep growing roots in the soil longer than cash crops alone. These additions will absolutely over time decrease soil loss and increase infiltration. But to what extent? Similarly, it’s reason­able to assume that the extra living plant uptake should reduce loss of N and P, but again, it is important to prove the extent to which the loss is mitigated.

For agriculture to remain “busi­ness as usual,” it’s critical to prove that cover crops can reduce losses of these pollutants. We need a success story to tell, and integrating cover crops can be a big one.

Recently, the Missouri Soybean Association and Missouri Corn Growers Association began a study that put water samplers on fields that were farmed using different practices. The samplers collect wa­ter any time there’s a runoff event. They track and measure total water volume, soil loss in suspended solids, N and P. For this study, these organizations used grant funding from EPA’s Clean Water Act Section 319 program, which specifically focuses on nonpoint sources of water pollution, such as agricultural runoff and soil erosion.

The information gathered from this research provides great insight about when losses are happening and what works to reduce total losses.

First, historical practices of grassed waterways and terraces seem to be working really well in re­ducing nutrient and sediment run­off. This is great news and proves the effectiveness of these practices that we’ve used for decades. Even when changing overall manage­ment to no-till or to include cover crops, it’s important to keep these structural practices in mind. When needed, nothing does a better job at stopping soil or nutrient loss than a good grass sod waterway.

Second, cover crops seem to be doing an overall good job at continuing to reduce nutrient and soil losses, especially in the spring. The large, intense rain events that come with spring not only hamper fieldwork, but they are also major contributors of those losses. Having a cover crop in place during these events can help. This also brings to mind some of the nutrient applica­tions made that time of year. Those nutrients can be especially vulner­able to losses and show up in the runoff. Minimize this risk by not applying right before large rainfalls, or move those surface applications to other times of the year when pre­cipitation is typically less intensive.

While it’s impossible to say that cover crops can reduce nutrient losses every time, it’s reasonable to say there are clear benefits. That conclusion is based on actual water sample data along with visual observations of field-level benefits. With the floods of 2019 fresh in our minds, the number of large rain events seem to be happening more often. For reasons both on and off the farm, cover crops are something to consider in row-crop agriculture.

For information about cover crop recommendations and how your cropping system can benefit, call me at 573-876-5246, email This email address is being protected from spambots. You need JavaScript enabled to view it. or con­tact your local MFA Agronomy team member.

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Keep calm and hang on: Still time to plant

For years, growers have been told the earliest-planted crop is the best crop. Dataset after dataset have been presented by university after university to back up this informa­tion. Couple this data with the “get ’er done” attitude typical of farmers, especially in the spring, and you get a mindset focused on one thing: getting a crop in as early as possible.

There is one fatal flaw in this mindset—early is not always better.

To say early planting has no advantages is not true either. An increased likelihood of flowering during milder weather, avoidance of certain pests and the possibility of an earlier harvest are all benefits of early planting. However, all those factors combined will not outweigh the two most important criteria for raising a top crop: soil conditions at planting and seed placement.

The simple fact is corn’s yield potential can still be quite high when planted into June. We witnessed this last year. There were several exam­ples of corn planted after June 1 nearly doubling yields of corn plant­ed into subpar conditions in April and May. So much is determined by a corn plant’s early life. Cold, wet soils cause inconsistent emergence and development, which leads to competition against other corn plants and greater vulnerability to disease. Small corn plants also have a much harder time metabolizing herbicides at this point.

Perhaps the biggest drawback of planting in wet conditions is what the planter actually does to the seed bed. Sidewall compaction was a very common issue encountered in 2019, caused by planters smearing and compacting the sides of the seed trench as it moved through wet soils. This can cause emergence issues due to poor seed-to-soil con­tact, but often the damage goes un­noticed until some type of stress is introduced. Root growth is limited, leading to mohawk or hatchet roots. Nutrient deficiencies or drought stresses are more evident in these fields much later in the growing season when planting conditions are all but forgotten. Often these issues get blamed on poor fertility or drought or other things, but it was very common for stressed fields in 2019 to show evidence of poor planting conditions. For example, when you can see trenches follow­ing the corn rows at planting, it was likely too wet, and hindered root growth is the likely result.

It’s also important to make sure seed placement is correct. Of course, much of this is aided by proper calibration and monitoring of the planter’s performance. Set­ting depth and down pressure are important as are making sure seed tube meters and all moving parts are doing their jobs in singulation.

However, among all the things we can control, speed is the most critical. Urgency bordering on im­patience becomes the enemy. Main­taining planting speed of 4.5 mph does as much for seed placement as any other practice. Sure we have “high-speed” planters, after-market “speed” tubes, and meters that can singulate at remarkable accuracy at high speeds, but singulation is a small part of seed placement. Consistent depth and placement in the seed trench are more important than singulation. Varying depth and placement cause not only geograph­ic inconsistency but also temporal inconsistency, which relates to un­even emergence and development.

The goal of planting should be to get all plants up within 12 hours of each other so they are competing on an equal playing field. The late emergers are like the runt pigs of a litter that take resources from the healthy pigs without gaining at a profitable rate themselves. High-speed planters can provide geo­graphic spacing consistencies, but even the best down-force systems struggle to compensate for row unit bounce when planting at high speeds. This causes higher inconsis­tencies in emergence.

With today’s equipment, most growers admit that they can finish their planting in less than a week. Moving from 4.5 mph to 6 mph means they can finish in roughly five and a half days instead of seven. How much yield loss is that one and a half days worth?

Though the advantages of early planting are real, they are also misleading. Yes, we want to take advantage of planting windows, but not at the cost of planting into cold or wet soils. If you drive a couple of miles per hour faster, are you accomplishing more? Maybe. But remember your goal—to raise yields. How do you achieve that goal? By giving your crop the best start from the beginning.

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