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The Effect of Spray Tips and Spray Volumes on Glyphosate and Paraquat Efficacy

INTRODUCTION. Higher spray volumes and smaller spray droplets theoretically should provide the most thorough coverage assuming the spray droplets reach the intended target. Spray volume, pressure, and spray tips influence spray droplet size. Thorough spray coverage is probably more

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The Effect of Spray Tips and Spray Volumes on Glyphosate and Paraquat Efficacy

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    10. Early Postemergence Oat Control 2 WAT As Influenced By Herbicides and Spray Volumes, 2001. (averaged across spray tips)

    11. Early Postemergence Oat Control 2 WAT As Influenced By Spray Tips And Volumes, 2001. (averaged across herbicides)

    12. EARLY POSTEMERGENCE 2000 HERBICIDE X SPRAY TIP SIGNIFICANT SPRAY VOLUMES NOT SIGNIFICANT 2001 HERBICIDE X VOLUME SIGNIFICANT SPRAY TIP X VOLUME SIGNIFICANT

    13. LATE POSTEMERGENCE EXPERIMENTS 2000-2001

    17. Late Postemergence Oat Control 2 WAT As Influenced By Herbicide and Spray Volumes, 2001. (averaged across spray tips)

    18. LATE POSTEMERGENCE 2000 SPRAY VOLUME SIGNIFICANT SPRAY TIPS NOT SIGNIFICANT 2001 HERBICIDE X VOLUME SIGNIFICANT SPRAY TIPS NOT SIGNIFICANT

    22. CONCLUSIONS Even though oat control with glyphosate and paraquat was different, the response to spray tips and spray volumes was similar. Oat control at 47 and 94 L ha-1 was equal or better than at 187 L ha-1 with both herbicides. Oat control with the Turbo Teejet, Air Induction, and XR Flat Fan tips was similar.

    23. IMPLICATIONS Lower spray volumes can provide equal or better weed control with more efficient use of time and resources. Use of new spray tips that produce larger spray droplets reduce the risk of spray drift while maintaining herbicide efficacy.

    24. FUTURE RESEARCH Confirm results with different herbicides and weeds. Evaluate new spray tips and delivery systems as they are introduced into the market.

    25. ACKNOWLEDGEMENTS Kansas State University Research and Extension Syngenta Successful Farming

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