ASK THE AGRONOMIST BLOG

Stine’s Ask the Agronomist blog is your source to the latest information from our expert team, including advice and insight on field practices, product recommendations, planting and harvest updates, new technologies, crop management, innovative research and information about how to keep your farm operation running smoothly year round. 

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    Best of Both Worlds: Use of Glyphosate and Glufosinate (Liberty®) in conjunction with LibertyLink® GT27™ Soybeans

    September 12, 2018

    Posted by Mike Smith in Crop Management

    With the exciting news regarding the availability of Stine® LibertyLink® GT27 brand soybeans for the 2019 growing season, there have been questions about how growers can maximize the technology. One question I keep hearing is, “can I spray both products on the beans at the same time?” Before answering that, growers must first understand certain characteristics regarding each of these chemistries to maximize their efficacy and prolong their usage with LibertyLink GT27 technology.

    Glyphosate is a Group 9 herbicide and is considered an organophosphorus compound.  Glyphosate is a systemic, translocating herbicide that inhibits the EPSP synthase pathway. The herbicide blocks essential amino acids necessary for the photosynthetic processes of the plant. It tends to work slowly, approximately 7–14 days, and is recommended to be sprayed with coarse to large-sized droplets in 5–10 gallons of water per acre. The typical rate for 41 percent solution is one quart per acre with a water conditioning agent (ammonium sulfate) at the rate of 8–17 pounds per 100 gallons of water and the use of a non-ionic surfactant for water droplet retention on leaves. This mix results in an active ingredient composition of 13.12 ounces per acre. The concentration of lethality at this rate is dependent on the water rate that is applied to the field, so as gallons per acre increase, so must the rate of glyphosate in the tank. It is recommended to spray glyphosate when weeds are actively growing and not under stress. In addition, precaution should be taken to avoid spraying during times of intense heat and moisture stress.

    Glufosinate is a Group 10 herbicide and is also considered an organophosphorus compound. However, glufosinate is a contact, semi-translocating herbicide that inhibits glutamine synthetase. It mainly kills by inhibiting a plant’s ability to utilize nitrogen and causing ammonia within the plant to become toxic to the plant. The herbicide tends to work very quickly, within 24–72 hours, and is recommended to be sprayed with medium to coarse sized droplets in 15–20 gallons of water per acre. It is recommended at rates of 29–36 ounces per acre with a carrier of ammonium sulfate at the rate of 1.5–3 pounds per acre. It is not recommended to spray Liberty with FloodJet nozzles, controlled droplet application equipment or air-assisted spray equipment. It is recommended to spray glufosinate when weeds are actively growing and not under stress. In addition, it is helpful to spray during daylight hours, in adequate temperatures (86 degrees Fahrenheit and above) with higher relative humidity.

    Based on these differences, the following recommendations should be observed:

    1. It is best to utilize these products in a sequential-combined application. Use glyphosate in burndown combinations with other effective modes of action and residual herbicides. For post-emergent applications, combine glyphosate and glufosinate with additional effective modes of action and residual herbicides. This provides the best chance of overcoming nature’s ability to adapt and combat herbicide resistance. For additional effective modes of herbicide action, contact your local extension weed specialist or Stine regional agronomist.

    2. For optimum weed control and long-term effectiveness of the trait system, it is recommended to utilize three effective site-of-action herbicides per application with one of those being a soil-applied residual herbicide.
    3. Always utilize the “most restrictive” label for guidelines. In this case, that would be glufosinate (Liberty).
    4. Spray volume should be applied in the 15–20 gallons per acre window.
    5. 1.5–3 pounds of ammonium sulfate should be used per acre.
    6. Target medium to coarse droplets. A good rule of thumb is volume per acre plus pressure should equal 60. For example, if you are spraying 15 gallons, then pressure should equal 45 psi.
    7. DO NOT use the addition of non-ionic surfactants.
    8. DO NOT apply during periods of heavy dew or fog. If relative humidity is low, increase droplet size to coarse droplets to counteract evaporative loss. DO NOT apply after two hours before sunset.
    9. Anti-foam agents may help prevent excessive foaming.
    10. DO NOT apply after R1 growth stage.
    11. Rainfast = 4 hours

    For more information about herbicide applications with LibertyLink GT27 brand soybeans, contact your local Stine sales agronomist.

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    Start Planning your 2019 Herbicide Program

    September 05, 2018

    Posted by Stine Seed in Crop Management

    While the upcoming harvest should be top of mind this time of year, growers shouldn’t lose sight of the 2019 planting season. When browsing seed catalogs and researching corn and soybean options for next planting season, it’s also important to start planning a herbicide program to ensure you’re able to manage your weed landscape and protect yields. Where do you start? First, you need to outline your current weed situation.

    Compile a List
    Pull together a list of all the weeds that caused problems in your fields not only this year but also in years past. Which fields were affected? What management practices did you implement and were they effective? Did your neighbors experience weed pressure? Spend time mapping out the top weeds that could be a concern in 2019, and share this list with your local Stine sales agronomist so that they can start researching which trait(s) might work best for your operation.

    Consider your Options
    Exploring every option for weed control is a must. Stine has a large lineup of corn and soybean numbers that feature herbicide tolerance, such as the new Stine® LibertyLink® GT27™ brand soybeans. StineLibertyLink GT27 brand soybeans are a triple-stacked herbicide-tolerant soybean with exceptional yield potential and built-in tolerance to three unique sites of action: glyphosate, Liberty® and a new HPPD/Group 27 herbicide for soybeans (pending EPA approval). For corn, we offer several options of Agrisure® trait corn, including numbers that confer tolerance to both glyphosate and/or Liberty® herbicide.

    You also want to consider which herbicide program will work best for your situation. Whether that’s burndown, pre- and post-emergence applications, Stine agronomists are available to help you plan your seed and herbicide program to get the best ROI.

    Review Label Restrictions
    Read all label restrictions before selecting a herbicide program. What might seem like an attractive option to help tackle your weed pressure, may have certain use restrictions that don’t make sense for your operation. Things to consider are use rates, probability of drift and volatization, rainfall and temperature recommendations. Remember that certain environmental conditions can affect a herbicide’s volatility and overall effectiveness, so consult with your neighbors about what traits they’re planting next year and what herbicide program they intend to use and share your plans with them as well.

    Consult your Local Stine Sales Agronomist
    Our RSAs and ISRs are available year-round to help you make those tough decisions on your farm. They are experts in what they do, and their main goal is to bring value to their grower customers. If you need assistance locating a Stine agronomist or sales representative in your area, use our Find Stine map on our website. This search will link you to a regional sales agronomist in your region who can get you started on the right path for 2019.

  • Stine® Celebrates 40th Year in Retail Seed Industry with Largest-Ever Soybean Offering and Latest Soybean Trait Technology
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    Stine® Celebrates 40th Year in Retail Seed Industry with Largest-Ever Soybean Offering and Latest Soybean Trait Technology

    August 29, 2018

    Posted by Stine Seed in Stine News

    Stine is pleased to announce the release of 44 Stine® LibertyLink® GT27 brand soybean options for the 2019 sales season — the broadest lineup in the industry. LibertyLink GT27 is the first commercially available soybean trait package that offers built-in tolerance to BOTH glyphosate and glufosinate for over-the-top application as well as tolerance to a new HPPD/Group 27 herbicide for soybeans (pending EPA approval). The 44 new LibertyLink GT27 lines will span a wide range of maturities, from 03 relative maturity to 44 relative maturity.

    “For the past 40 years, Stine has been uniquely positioned to provide growers the latest innovative products on the market, including new choices for weed management,” states Myron Stine, company president. “We are excited to offer such an expansive lineup of LibertyLink GT27 soybeans to meet our customers’ needs, especially as we celebrate our 40th year in the retail seed business.”

    LibertyLink GT27 is a triple-stack trait technology that will give growers outstanding weed control, unparalleled flexibility in weed management options and high-yielding, elite genetics for exceptional crop performance. Visit www.stineseed.com to learn more about Stine’s lineup of LibertyLink GT27 soybeans or contact your local Stine sales representative.