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Potential Impact of Group 2 (ALS Inhibitor) Herbicide Residue on Winter Wheat Survival - Early Reconnaissance

Hammermeister, E.H. K.J. Greer and C.D. Ball . 2012. Soils and Crops

Abstract

Next to the coinciding harvest of spring crops, the biggest challenge winter wheat seeding faces is finding early matured and harvested crop land for seeding at the optimum window from late August to early September. Pulse stubble provides an opportunity to get winter wheat seeded in a timely basis. Growing winter wheat on pulse stubble is commonly discouraged due to the very limited residue and potential for snow trap. As overwinter success is connected to snow cover and subsequent insulation against cold temperatures. We propose another challenge that may be limiting success on pulse stubble. The repeated use ALS inhibiting (Group 2) herbicides and soil residual that can inhibit root growth, nutrient uptake and subsequent fall seedling establishment. A reconnaissance study was conducted on two locations, each with pulse stubble but with differing Group 2 herbicide residue. Soil temperature monitoring showed that of the three winter wheat cultivars examined, all should have easily survived the winter of 2010-11. Significant impact on stand survival and yield was observed on the soil having Group 2 residues. A cultivar interaction was also noted. Further investigation would facilitate identifying potential crop nutrition management techniques to overcome agronomic challenges of successfully growing winter wheat on pulse stubble. Investigation of winter wheat cultivar tolerance to ALS inhibiting herbicide residues would also be of value

Key Words

Winter wheat agronomy, Crop rotation, ALS inhibitor soil residue, Winter Cereal Survival Model, PRS™ Technology