Texas gets weed control in dry fertilizer

Texas cattle raisers have another way to get weed control in pastures — in one step.

The Texas Department of Agriculture has registered GrazonNext and Chaparral pasture herbicides for impregnation onto dry fertilizer.

The two Dow AgroSciences pasture herbicides are labeled for impregnation only in the state of Texas.

Herbicide impregnated onto dry fertilizer has long been a staple in lawn applications. And many ranchers use herbicide with liquid fertilizer on pastures and hay meadows. But until the recent registrations, no current pasture herbicide was labeled for impregnation onto dry fertilizer.

Key Points

Cattle raisers in Texas have another way to control weeds in pasture in one step.

Texas Ag Department OKs two pasture herbicides for use with dry fertilizer.

Impregnating dry fertilizer with Chaparral, GrazonNext herbicides is only for Texas.


“For ranchers who prefer to use dry fertilizer, this could save a trip or an extra custom application,” says Vernon Langston, Dow AgroSciences range and pasture field scientist. “At busy times of a year, it could mean the difference between having weed control or not.”

To impregnate fertilizer, dealers and applicators spray a concentrated solution of herbicide on dry fertilizer pellets during blending. (Dow AgroSciences recommends retailers dye all herbicide-impregnated fertilizer to alert users to the presence of herbicide.)

Herbicide’s application rate

The herbicide has to be applied with at least 200 pounds of dry fertilizer per acre to get enough herbicide distributed. Spreader trucks or fertilizer buggies simply apply herbicide-impregnated fertilizer as they would normally apply dry fertilizer.

From there, rainfall puts the herbicide-fertilizer solution into the soil. Weed control depends on soil activity of herbicide and root uptake by weeds.

For that reason, weed from the impregnated dry fertilizer usually will be less than from a liquid foliar application. Andy Carriger, a Dow AgroSciences range and pasture specialist, says control also may be slower. “Where we normally expect 90% or better control from a liquid application, we often see about 75% control from impregnated fertilizer,” he says. “Sometimes it’s better, but 75% should be the expectation.”

Because GrazonNext contains 2,4-D, the GrazonNext product is a state-limited use.

This article published in the April, 2011 edition of THE FARMER-STOCKMAN.

All rights reserved. Copyright Farm Progress Cos. 2011.