Weed control in no - till. Technological variables and environmental application risks

Authors

  • Matilde Mur
  • Mariano Julio Ponce
  • Juan M. Vázquez
  • Facundo Guilino
  • Víctor Merani
  • Telmo Palancar
  • Roberto H. Balbuena

Keywords:

droplet density, hollow cone, deflector nozzle, drift, water sensitive cards

Abstract

The use of low application rates in systemic herbicides spraying is a usual practice in Argentina. Field trials were carried out with the aim to evaluate the efficiency and drift risks of glifosato technological application alternatives. Two spraying techniques were compared: High application rate (AV) with TT 11002 Teejet® nozzles and 70 l ha-1 and Low application rate (BV) with AD5 AC13 Albuz® hollow cone nozzles and 30 l ha- 1. Four downwind target areas of the site were evaluated to determine the direct effects of the application and those of the accumulated drift in places corresponding to the following 3 passes (P1, P2, P3 and P4). Spray drift was evaluated too by means of vertical towers at 1, 2 and 3 m in height. Droplets density, coverage, efficiency and Volume Median Diameter (DV0,5) were quantified by water sensitive paper cards and image processing software. AV reached greater droplets density than BV in the first pass but similar drops number in the rest. Coverage was 13.28% for AV and 6.13% for BV, with significant differences related to a greater DV0,5. Efficiency was similar for both techniques, with values of 38.28% and 45.97% for BV and AV respectively. Airborne drops population was homogeneous in the range of 70 μm to 80 μm without differences in the drops density and coverage, but BV released to the environment significantly more glyphosate. The BV technique is possible to use in relation to control efficiency but presents lower evenness and greater drift potential risk.

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References

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Published

2018-11-15

How to Cite

Mur, M., Ponce, M. J., Vázquez, J. M., Guilino, F., Merani, V., Palancar, T., & Balbuena, R. H. (2018). Weed control in no - till. Technological variables and environmental application risks. Journal of the Agronomy College, 116(2). Retrieved from https://revistas.unlp.edu.ar/revagro/article/view/6182

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