Impregnated Fertilizer Treatment Facts

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What to Know about Weed & Feed

Deciding What Herbicides for Fertilizer Impregnation

The only currently labeled pasture herbicides available for fertilizer impregnation are DuraCor® and GrazonNext® HL herbicides.

License Requirements for Treated Fertilizer

Since DuraCor® and GrazonNext® HL are federally classified as general use herbicides no RUP license is required. However, in states where 2,4-D has state restrictions a license is required to purchase GrazonNext HL .




Find the map of States with 2(ee) Recommendation for DuraCor® or GrazonNext® HL impregnation on dry fertilizer here. Scroll to the bottom of the page. 




Application Timing

This application can be used year-round; however, applications made when weeds are young and immature provides the best results and long-term weed control.

Weed Spectrum Controlled With This Treatment Method

The spectrum of weeds controlled with treated fertilizer extends to most species listed on the DuraCor and the GrazonNext HL labels.

Residual Length

Expect similar length of control to other rates and treatment methods used for DuraCor and GrazonNext HL applications.

Rainfall Herbicide Activation

Rainfall is required for consistent herbicide efficacy. Typically, a rainfall of at least 0.25 inches within 30 days of application is necessary for consistent herbicide performance.

How Herbicides Work With This Treatment

Weed control is almost entirely dependent on the soil residual activity of the herbicide and plant root uptake. If, however, the treated fertilizer prills land on susceptibleweeds, post-emergent control can occur through this method.

Impregnated Fertilizer and Clover

Treated fertilizer with DuraCor or GrazonNext HL could cause injury to existing stands of clover species.


What to Know Before You Go


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Label precautions apply to forage treated with GrazonNext HL and to manure from animals that have consumed treated forage within the last three days. Consult the label for full details. ® TM Trademarks of Corteva and its affiliated companies. GrazonNext and Chaparral are not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Both products are labeled for fertilizer impregnation in the states of AL, AR, FL, GA, IA, KS, KY, LA, MO, MS, NC, NE, OK, OR, SC, ND, SD, TN, TX, VA, WV and WA. Always read and follow label directions.  ©2021 Corteva Agriscience