Applying Enlist One® + glyphosate at 10 gal./A. never resulted in greater than 70% (waterhemp) and 75% (fall panicum) control. However, by upping our spray volume from 10 to 15 gal./A., waterhemp control increased by 17%, and fall panicum control increased by 20%. Why did two systemic herbicides, Enlist One and glyphosate, have such a large response to carrier rate? Even though complete coverage is not as crucial, the herbicide must still reach each plant. Putting the Power in the Pre™ generally leads to reduced weed pressure and greater control; therefore, a pre-emerge was withheld from these demonstration plots to ensure enough vegetation was present at the time of the post-emerge treatment. When increasing from 15 to 20 gal./A., we saw less response with Enlist One + glyphosate vs. Enlist One + Liberty®. When Enlist One + glyphosate was applied at 20 gal./A. (compared to 15 gal./A.), waterhemp control only increased by 3% and fall panicum control by 1%. Note that in heavy vegetation scenarios, 20 gal./A. may still be needed with Enlist One + glyphosate.
Categories: Agronomy, Agronomy Talk
Tags: Agronomy, Herbicide, weed management, enlist
The XtendFlex® system allows farmers to utilize an approved dicamba formulation as well as Liberty® and glyphosate. Beck’s Practical Farm Research (PFR)® data shows that using multiple effective SOAs in the pre-emerge resulted in fewer waterhemp for the post-emergence application to control. What is the relationship between the pre-emerge application and post-emergence application? If more money is spent on the pre-emerge application, can less be spent on the postemergence application? In 2021, the Beck’s PFR team set out to determine how the pre-emergence application impacted the post-emergence application and, conversely, how the post-emergence application impacted the pre-emergence application in the XtendFlex system. This study was designed to evaluate various programs in the XtendFlex system that target heavy, medium, and low waterhemp pressure.
Tags: Agronomy, Herbicide, weed management, xtendflex
XtendFlex® provides farmers the opportunity to utilize an approved dicamba formulation such as XtendiMax® or Engenia®, as well as Liberty® and glyphosate. Though some of our problematic weeds are resistant to glyphosate, there are several that glyphosate remains highly effective against. Glyphosate is also strong on many of the weeds that Liberty is weak on, such as cocklebur, velvetleaf, and grasses. Growth regulators such as Engenia or XtendiMax will be highly effective on broadleaf weeds but have no activity on grasses. The XtendFlex system allows farmers the opportunity to utilize Engenia or XtendiMax in the pre-emerge or early post-emergence application, providing short-term residual with no potential crop response. An additional option could include applying Liberty, separately, in-season to control any escaped weeds.
Tags: Agronomy, Herbicide, weed management, xtendflex, post-emergence
The foundation to a successful herbicide program starts with the Power in the Pre™. A successful pre-emerge herbicide can help reduce the amount of weed pressure in the post-emergence application. Many post-emergence applications are sprayed in the earlier vegetative stage. However, data shows by delaying weed removal until the post-emergence trip, a significant yield reduction can occur. This highlights the negative impact of early weed competition and demonstrates the Power in the Pre.
Tags: Agronomy, Herbicide, weed management, pre-emerge
The Enlist™ system provides farmers the opportunity to utilize 2,4-D choline, Liberty®, and glyphosate. Beck’s Practical Farm Research (PFR)® data shows that utilizing multiple, effective SOAs in the pre-emerge resulted in less waterhemp for the post-emergence application to control. In 2021, Beck’s PFR set out to determine how the pre-emergence application impacted the post-emergence application and, conversely, how the post-emergence application impacted the preemergence application in Enlist E3® soybeans. The study was designed to evaluate various programs in the Enlist system targeting heavy, medium, and low waterhemp pressure.
Tags: soybeans, Agronomy, Herbicide, weed management, enlist
Coverage is king with Liberty®. However, when tank-mixed with Enlist One®, how does nozzle type, orifice size, and PSI restriction change our Liberty management? Products like Enlist One are systemic herbicides, so coverage is not as crucial compared to contact herbicides like Liberty. With Liberty, we strive to have medium droplets to ensure proper coverage. However, tank-mixing Liberty with Enlist One will restrict our droplet size from medium droplets to coarse and ultra-coarse droplets. Applications of Enlist One require a specific PSI as well as nozzle. These restrictions result in different management practices vs. applying Liberty by itself, or Liberty with glyphosate. Enlist One + Liberty provides very effective control of glyphosate-resistant waterhemp. It’s key to understand these management practices if planning to utilize this tank-mix. Beck’s Practical Farm Research (PFR)® data has shown an advantage to Enlist One + Liberty over Enlist One + glyphosate for waterhemp control.
Tags: Agronomy, Herbicide, weed management
The more we add to the tank, the more chances antagonism can occur, especially when we tank-mix contact and systemic herbicides together. The larger weeds become, the greater the chance antagonism will occur. Grass or volunteer corn herbicides like clethodim can have antagonism, especially when mixed with certain Group 15 herbicides. One way to overcome the antagonism is to increase the clethodim rate to 12 oz. (2 lb. ai. product)/A. Products such as Enlist One® and Liberty® are very effective on glyphosate-resistant weeds like waterhemp and giant ragweed. However, Enlist One + Liberty will be weaker on grasses compared to Enlist One + glyphosate. One solution would be to add clethodim, but antagonism can occur when tank-mixed with Enlist One.
There is a difference between residual activity and soil activity. Residual herbicides typically suppress weeds from germinating for four to five weeks. Examples include: Authority®, Valor®, Fierce®, and Zidua®. Products that have soil activity can suppress weeds for 7 to 14 days but will not have enough activity to prevent future flushes of weeds later in the season. Engenia® and XtendiMax® can suppress the germination of small-seeded broadleaf weeds such as waterhemp, but we must pair Engenia and XtendiMax to achieve satisfactory weed control.
Tags: Agronomy, Herbicide, Dicamba, soil, weed management
Replant is always a difficult decision to make, but what is the best option to terminate a failed corn stand? One option could be tillage, but depending on the type of tillage and the growth stage of the corn, it may take two passes to achieve 100% control. The benefits of tillage would be not having a plant-back restriction compared to some chemical options that require plant-back restrictions. One disadvantage of tillage would be the impact on the residual herbicide. Pre-emerge herbicides act as a blanket, reducing weed emergence, but tillage can destroy this barrier.
When it comes to managing problematic weeds such as waterhemp, we spend a majority of our time thinking about soybeans but, what is the best way to manage waterhemp in other crops such as corn? When it comes to corn, we rely on many of the same herbicide groups we depend on in soybeans, such as Groups 5 and 15 herbicides. However, one advantage to managing weeds in corn is the ability to use HPPD or Group 27 herbicides. Group 27 herbicides are very effective on waterhemp pre-emerge, as well as post-emergence. Targeting weeds when they are less than four inches is the key to success with Group 27 herbicides, as they will begin to struggle once waterhemp plants become greater than four inches. Therefore, an additional effective SOA may be needed to effectively control larger waterhemp plants.
Tags: corn, Agronomy, Herbicide, weed management
Beck’s Practical Farm Research (PFR)® data suggests 60 lb. to 90 lb./A. of cereal rye can effectively suppress waterhemp compared to the untreated check. In addition to knowing the proper rate to seed cereal rye, we need to determine how to terminate it. Crimping can lay the cover crop down, creating a mat, resulting in effective weed control. The timing and growth of the cereal rye will impact the success of the crimping. For the best results, wait for the cereal rye to head out. If terminated too soon, the crimper will not be successful because the cover crop will recover and continue to grow. Using glyphosate for chemical termination opens the window to earlier applications but will not get the mat of cover as with a crimper. Both methods can be utilized. Spraying the cereal rye and waiting 24 hours to crimp will allow for herbicide uptake to occur before the leaves are damaged with a crimper.
Tags: Agronomy, Herbicide, Cereal Rye, weed management
Cereal rye can help suppress problematic weeds like waterhemp, as well as provide soil health benefits. The question becomes, what is the optimum cereal rye rate to best suppress waterhemp? Beck’s Practical Farm Research (PFR)® conducted studies in 2021 to see what the optimum rate might be. The cereal rye was terminated with crimping or chemical termination the following spring. To evaluate the benefit of a cover crop, no chemical but glyphosate was applied to terminate the cover crop.
Enlist E3® soybeans allow the opportunity to utilize 2,4-D choline, Liberty and glyphosate in-season. With so many options, what is the best tank mix? Liberty is very effective on glyphosate-resistant (GR) weeds such as waterhemp. However, Liberty will be very weak on grasses and Enlist One will have no grass activity. With today herbicide systems with multiple traits we should target our problematic weeds. For instance, the problematic weed in this plot is GR waterhemp. Therefore, we should utlize Enlist One + Liberty to provide two effective SOA’s on this GR waterhemp population. We know we will sacrifice grass control but glyphosate or clethodim can be utilized in a later application to control any grass escapes.
Twenty years of Beck’s Practical Farm Research (PFR)® data indicates that one key to optimizing soybean yield over time is early planting. Early planting of soybeans increases the number of nodes, which creates additional pods and higher yield.
As farming becomes more complex and time becomes more precious, farmers are searching for ways to increase revenue and manage input costs on every acre. This leads us to ask, what soybean management practices can save you time, make the most sense agronomically, and make you money?
Manganese (Mn) is important in a soybean plant for its role in the activation of enzymes and in the process of photosynthesis. Additionally, Mn is known to regulate potassium (K) uptake.
We know that different nutrients are required at different times for optimum soybean yields. Current soybean biomass production shows a two-fold increase from the 1930s, and yields show a three-fold increase. With these drastic changes in genetics, it only makes sense that we would also see changes in nutrient uptake. In addition to genetics, there is evidence that environmental factors like temperature, moisture, and soil fertility influence nutrient uptake.
In corn-after-corn systems, the high amount of residue can immobilize nitrogen and make it unavailable to the following crop. Robust® and Res Plus are products the help to feed microorganisms in the soil. By supporting microbial communities, these products lead, in turn, to increased microbial degradation of corn residue in corn-after-corn systems. Applying these products in the fall may help speed up residue breakdown so the carbon penalty is paid off earlier in the growing season. This would allow for a transition from immobilization to mineralization of residue-bound nitrogen (N).
Nitrogen (N) is a mobile nutrient. When we look at the N cycle, we think of NO3 - is the N form most readily taken up by the plant, followed by NH4 +. Loss of N when applying urea or UAN can occur as ammonia volatilization (lost in gaseous form). In the case of UAN applications, N loss can also occur in the form of NO3 - leaching if a heavy rain follows or denitrification. Two ways to prevent N loss are more accurate timing and more precise placement. If we can supply N to the plant when it needs it, this allows less time for N loss. If we supply N near the base of the plant where it can more easily access the nutrient, this could increase N use efficiency.
When it comes to insecticides in corn and soybeans, it's important to remember that different pests are present at different points in the season. Whether or not an insecticide is warranted can be determined by a few factors. What insects are present? Does this field have a history of a particular insect pest? Are these insects present at a level that will impact your yield and ROI?