Getting trifluralin past the stubble

31 Jul, 2002 10:00 PM
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RYEGRASS control with trifluralin after high yielding wheat has always presented problems due to the crop's thick stubble.

In an attempt to find new ways to improve trifluralin efficacy in thick stubble, the WA No-Tillage Farmers Association is testing three methods of herbicide application.

The first was using high water rates at application of 80L/ha, to wash the trifulralin to the ground.

Another was the use of 2.5pc granules.

The third was the use of trifluralin-treated river sand at 1t/ha.

The concept of using river sand came from a WA farmer, Whinston Brewen, who used trifluralin treated lime sand.

In this trial, to avoid a reaction from the lime sand, WANTFA used river sand.

According to WANTFA scientific officer Bill Crabtree, all three treatments seemed to do a reasonable job.

However, the trifluralin application method was not ready for commercial adoption.

Despite being regularly used in Canada, Mr Crabtree said the trifluralin treated sand technique was only at the experimental stage.

According to Mr Crabtree, a possible constraint to its adoption was expense.

Although there was no price revealed, he said Nufarm had informed the group that cartage and treatment formulation would be expensive.

"No-till farmers in Canada regularly use the strategy so we need to test it to see how effective it is in WA," he said.

"The real issue is getting the trifluralin down to the ryegrass through thick stubble."

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