Weed Management in No-Till Organic Production
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Collapse ▲By: Adam Smith, and Dr. Chris Reberg-Horton
Utilizing the roller-crimper in no-till soybeans has shown to be a promising tactic for organic weed control. For the past two years, we have been experimenting with killing rye cover crops with the roller-crimper. In addition, we augmented that rye with two different OMRI approved herbicides for in-row weed control and a high-residue cultivation treatment for between-row weed control.
Using the roller-crimper, we achieved 100% rye kill when rolling the rye at its early milk stage. We compared the roller-crimper to the flail-mower and found that both modes of kill provided sufficient weed control when compared to the weedy check. Granulated corn gluten meal was used as a pre-emergent herbicide treatment and actually increased weed pressure later in the season by acting as an N fertilizer. Clove oil provided additional control, but wasn’t significantly better than using the rye mulch only. The between-row cultivation provided additional control, but exposed the row middle by pushing the rye mulch to the side.
Rye biomass levels varied greatly across locations and years and had a large effect on the success of the system. Rye biomass levels below 6000 kg/ha (5340 lb/acre) did not provide sufficient control. Our best locations, in terms of yield and weed control, had biomass levels higher that 9000 kg/ha (8010 lb/acre). The results conclude that the roller-crimper is an effective weed control tactic when rye biomass levels are high.