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Droplet Size and Phytotoxicity of Herbicides

Published online by Cambridge University Press:  12 June 2017

K. S. McKinlay ,
S. A. Brandt ,
P. Morse  and
R. Ashford
K. S. McKinlay
Affiliation:
Canada Dep. of Agr., Res. Sta., Saskatoon, Saskatchewan, Canada
S. A. Brandt
Affiliation:
Crop Sci. Dep., Saskatoon, Saskatchewan, Canada
P. Morse
Affiliation:
Statistical Research Service, Canada Agriculture, Ottawa, Canada
R. Ashford
Affiliation:
Crop Sci. Dep., Saskatoon, Saskatchewan, Canada
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Abstract

An oil soluble formulation of the dodecyl (51% w/w) and the tetradecyl (13% w/w) amine salts of (2,4-dichlorophenoxy)acetic acid (2,4-D) was diluted with diesel oil and applied in homogeneous sprays of 100, 200, and 400-μ. droplets to seedlings of sunflower (Helianthus annuus L. ‘Peredovik’). At each droplet size all combinations of five dosage levels and five spray volumes were compared. For the same applied dosage the amount of stem curvature increased as droplet-size was decreased. When compared with 100-μ droplets, approximately three times and six times as much active ingredient was needed to produce the same effect with 200-μ and 400-μ droplets, respectively. For a fixed droplet-size, the effective dosage could be increased equally well by increasing the concentration or by increasing the number of droplets per unit area.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 5 , September 1972 , pp. 450 - 452
Copyright
Copyright © Weed Science Society of America 

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References

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