May 2018
Farm & Field

Soil Fertility + Pasture Weed Control

Pasture managers can now get weed control as a part of their dry fertilizer application.


Agri-AFC is excited to share the initial results of their first applications of GrazonNext HL-impregnated fertilizer. As of the end of March 2018, approximately 1,000 acres of pasture land in Mississippi have been treated with this new process.

The original registrations were in Oklahoma and Texas. Mississippi and Alabama received the registration in 2015-2016.

We have been excited for some time to start this project as our relationship with Dow AgroSciences continues to grow.

For this process, we used at least 200 pounds per acre of dry fertilizer and 2 pints (1 quart) of GrazonNext HL. We applied it in early spring as weeds were actively growing, but still small.

The best thing about this method is that a producer can take care of a great portion of pasture weeds while also taking care of soil fertility. The best result of an herbicide is a thick, healthy stand of forage.

With this process, you can use fertilizer on perennial forages to give them the boost they need to be healthy while eliminating many of those profit-robbing weeds.

Not just any retail location can immediately setup to do this. We recommend that, if you want to fertilize any row-crop acres, you go to a designated blender for the GrazonNext HL treatment to make sure there is no cross contamination in sensitive crops such as cotton, corn and soybeans. The Agri-AFC locations in Magnolia and Hattiesburg (both in south Mississippi) have designated blenders for this treatment, only available in Mississippi for now.

Please note this application saves the producer time and money because you do not have to make two separate passes to fertilize then control weeds. You are getting it done in one application.

Dow AgroSciences recently released this information on GrazonNext HL.


Get Pasture Weed Control Via Dry Fertilizer

Pasture managers in 20 states now can get pasture weed control as part of their dry fertilizer application.

Dow AgroSciences has issued a bulletin containing instructions for applications of dry fertilizer impregnated with GrazonNext HL herbicide and Chaparral herbicide. It’s a Section 2 (ee) Product Bulletin under the Federal Insecticide, Fungicide and Rodenticide Act.

"For producers who use dry fertilizer, this innovation can save a trip across a pasture, save on application costs and save the trouble of calibrating a sprayer," said Jillian Schmiedt, Dow AgroSciences Range and Pasture product manager. "Because the herbicide is part of the fertilizer granule or prill, drift is nearly eliminated."

Many ranchers and custom applicators blend herbicide with liquid fertilizer to be applied on pastures and grass hayfields. But, until recently, only Texas and Oklahoma were included in the bulletin allowing herbicide impregnation onto dry fertilizer.

Now, Dow AgroSciences has issued the bulletin for 18 other states. GrazonNext HL and Chaparral can be impregnated onto dry fertilizer in Alabama, Arkansas, Florida, Georgia, Iowa, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, North Carolina, Oklahoma, Oregon, South Carolina, South Dakota, Tennessee, Texas, Virginia and Washington.


How It Works

Impregnating fertilizer with GrazonNext HL or Chaparral herbicide is a simple process for the herbicide retailer. Herbicide in a concentrated solution is sprayed on the dry fertilizer granules or prills during the blending process.

To get an adequate dose of herbicide properly distributed, the herbicide should be applied with at least 200 pounds of dry fertilizer per acre.

Operators of spreader trucks or fertilizer buggies then apply the treated fertilizer as they would normally.

From there, rainfall puts the herbicide-fertilizer mixture into the soil. Weed control is almost entirely dependent on the soil-residual activity of the herbicide and root uptake by the weeds. For that reason, weed control from impregnated fertilizer may be less than it would be from liquid foliar applications that work through both leaves and soil activity, said Dow AgroSciences Range and Pasture experts. Control also may be slower.

In practice, however, many users report weed control comparable to liquid applications.


Precautions and Restrictions

Chaparral is not recommended for use in pastures of Bahia grass or seeded with ryegrass. Chaparral in a liquid foliar treatment can be used to control Pensacola Bahia grass and ryegrass; injury to these species is possible from dry fertilizer impregnated with Chaparral.

Dow AgroSciences requires dedicated equipment for herbicide-impregnated fertilizer – to be used on pasture and nothing else – to avoid potential for the herbicide to be spread on sensitive crops. Adding a dye alerts users to the presence of the herbicide. The dye also makes it easier for the retailer and customer to tell how well it’s blended.

More information can be found at