As with corn herbicides for the coming growing season, chemical companies are offering various glyphosate formulations for soybean weed control again this year.
Syngenta, Monsanto and Dow AgroSciences are each introducing two new glyphosate formulations, with NuFarm Americas offering one.
Touchdown HiTech, from Syngenta, is a highly concentrated potassium glyphosate designed for burndown treatments where growers want to use their own surfactants and additives. It can also be used over-the-top of Roundup Ready soybeans as well as other Roundup Ready crops.
The product, at 5 lbs. glyphosate/gal., should be applied in areas with dense weed canopies. Adding an ammonium sulfate can improve weed control, according to the company.
Syngenta's Sequence is a foliar systemic herbicide that provides residual control in soybeans. It contains 2.25 lbs. glyphosate and 3 lbs. S-metolachlor active ingredient.
Monsanto's Roundup OriginalMax is a lower-cost alternative to Roundup WeatherMax — without its Transorb technology.
Both products are potassium salts, but WeatherMax has a different surfactant system, explains Rick Cole, Monsanto Technology Development manager.
Cole calls Roundup WeatherMax, which has the benefits of Transorb technology and Roundup rewards, a “premium product. Roundup OriginalMax is for the grower who is content with a different surfactant system and fewer benefits from Roundup rewards,” Cole adds.
RT Master II, also from Monsanto, is a highly concentrated glyphosate — a 150-gal. shuttle treats 1,200 acres at its 16-oz. rate, according to the company. The herbicide can be used for fallow, preplant, preharvest and post-harvest applications.
Glyphomax XRT, from Dow AgroSciences, is a 5.4-lb. glyphosate formulation with surfactant and a full-service policy. The company also offers Durango, a similar surfactant-loaded, 5.4-lb. glyphosate without a service policy.
NuFarm America's Extra Credit 5 is a 5-lb. rate of glyphosate that's equivalent to Roundup UltraMax, says Tim Birkel, U.S. ag marketing specialist with NuFarm. Extra Credit 5 includes a surfactant and is a 1-lb. glyphosate increase from the company's Credit Extra and Credit Systemic products.
DuPont adds Canopy EX to its herbicide lineup, a water-dispersible granule formulation of chlorimuron ethyl and tribenuron methyl. It can be used as a rate of 1.1-3.3 oz./acre for burndown and residual control before soybean planting in no-till or conservation tillage.
Clethodim 2EC, a generic version of Select herbicide, is from Micro Flo. This postemergence product controls a broad spectrum of actively growing grasses.
For more herbicide information, visit www.cornandsoybeandigest.com. Click on the 2005 Soybean Weed Control Guide, select your problem weeds and lists of herbicides that control or suppress those weeds will appear.