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The Effect of 2,4-D on Rapeseed

Published online by Cambridge University Press:  12 June 2017

M. Betts  and
R. Ashford
M. Betts
Affiliation:
Dep. Crop Sci., Univ. of Saskatchewan, Saskatoon, Sask., S7N-0W0, Canada
R. Ashford
Affiliation:
Dep. Crop Sci., Univ. of Saskatchewan, Saskatoon, Sask., S7N-0W0, Canada
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Abstract

Field experiments were conducted to compare the effects of 0.07, 0.14, 0.28, and 0.56 kg/ha of 2,4-D [(2,4-dichlorophenoxy)acetic acid] amine on plant growth, seed production, and seed quality when applied at four growth stages of summer rape (Brassica napus L. ‘Zephyr’) and turnip rape (Brassica campestris L. ‘Span’). At all growth stages, seed yield of turnip rape, was significantly reduced by each additional increment of 2,4-D. The difference in response of the two species may relate in part to differences in spray droplet retention of the leaf surfaces. The herbicide did not affect the germination of harvested seed although treatment with the higher rates at the bolting and flowering stages resulted in the production of some shrivelled seed that was lost on cleaning. Some herbicide treatments caused a marked increase in size of harvested seed. There was a trend towards decreased seed oil content with increasing rate of 2,4-D at the bolting and flowering stages, but oil production losses were mainly reflected through losses in seed yield. The time required for both species to reach maturity increased with increasing rate of herbicide when applied at the vegetative stages. In additional field studies, 2,4-D significantly reduced seed yield in turnip rape when applied at the 3- to 4-leaf stage at 0.035 kg/ha, and 0.018 kg/ha sometimes produced visible effects without noticeable loss in yield.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 4 , July 1976 , pp. 356 - 360
Copyright
Copyright © 1976 by the Weed Science Society of America 

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