How dry impregnated fertilizer works
Impregnation is the process of applying a concentrated herbicide solution on dry fertilizer granules during the blending process.Know How ⟶
The only currently labeled pasture herbicides available for fertilizer impregnation are DuraCor™, GrazonNext® HL and Chaparral™ herbicides.
Since DuraCor™, GrazonNext® HL and Chaparral 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™, GrazonNext® HL or Chaparral™ impregnation on dry fertilizer here. Scroll to the bottom of the page.
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.
Use caution when applying Chaparral to tall fescue as stunting, yellowing, or seed head suppression may occur depending on timing and rate of application. See label for complete details.
The spectrum of weeds controlled with treated fertilizer extends to most species listed on the DuraCor, GrazonNext HL and the Chaparral labels.
Chaparral™ applied using this method is not recommended for use in bahiagrass pastures or those seeded with ryegrass as injury to those species may occur.
Expect similar length of control to other rates and treatment methods used for DuraCor, GrazonNext HL and Chaparral applications.
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.
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.
Treated fertilizer with DuraCor, GrazonNext HL or Chaparral could cause injury to existing stands of clover species.
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. R01 392 029 (05/19) 010-58718 ©2021 Corteva Agriscience