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Factors affecting the operation of the weed-sensing Detectspray system

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw ,
Louis J. Molnar ,
Duane F. Chevalier  and
C. Wayne Lindwall
Robert E. Blackshaw*
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada T1J 4B1
Louis J. Molnar
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada T1J 4B1
Duane F. Chevalier
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada T1J 4B1
C. Wayne Lindwall
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada T1J 4B1
*
Corresponding author. blackshaw@em.agr.ca
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Abstract

Field experiments were conducted for 3 yr to determine the effect of various biological and physical factors on the operation of the weed-sensing Detectspray system. Plant detection is achieved by sensors measuring differential reflectance of red and near-infrared wavelengths of light from green plants, crop residues, and soil. Weed detection was greatly reduced 70 to 80 min after sunrise and before sunset when operated at lat 50°N because of reduced solar irradiance. Tall, dense-standing crop stubble limited detection of small weeds at the soil surface. Weed detection varied with plant species. Canola with three to four leaves consistently was detected, but wheat or green foxtail usually required five to six leaves to be detected. Small weeds were detected if present at densities greater than 70 plants m−2. Growers and commercial applicators need to be aware of the limitations of the Detectspray system to use it effectively to control weeds with concurrent reductions in herbicide use.

Keywords

Green foxtail, Setaria viridis (L.) Beauv. SETVIcanola, Brassica napus L.wheat, Triticum aestivum L.Infrared sensorreduced herbicide useselective sprayerweed managementAMAREKCHSCSETVI
Type
Weed Management
Information
Weed Science , Volume 46 , Issue 1 , February 1998 , pp. 127 - 131
Copyright
Copyright © 1998 by the Weed Science Society of America 

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References

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