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Effects of Preplant Treatment Interval and Tillages on Herbicide Toxicity to Winter Wheat (Triticum aestivum)

Published online by Cambridge University Press:  12 June 2017

Alex G. Ogg Jr.  and
Frank L. Young
Alex G. Ogg Jr.
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., 215 Johnson Hall, Wash. State Univ., Pullman, WA 99164
Frank L. Young
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., 215 Johnson Hall, Wash. State Univ., Pullman, WA 99164
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Abstract

Glyphosate plus 2,4-D at 0.3 + 0.5 or 0.4 + 0.7 kg ae ha-1 applied 31 to 1 d before seeding did not affect wheat yields or grain test weights, in field experiments in conventionally tilled and no-till winter wheat. In the conventionally-tilled system in each of two years and in the no-till system in a year with 48 mm rain within 7 d before wheat was seeded, picloram applied at 0.14 kg ai ha-1 from 31 to 1 d before seeding reduced crop yields by 7 to 8%. In the conventionally-tilled system in a year with only 2 mm rain within 7 d before wheat was seeded, 2,4-D at 3.4 kg ae ha-1 and dicamba at 0.14 kg ae ha-1 applied 30 to 1 d before seeding, reduced wheat yields by 7 and 4%, respectively. Grain test weights in both tillage systems were increased slightly by picloram at 0.14 kg ha-1, but were decreased slightly by dicamba at 0.14 kg ha-1, in the year with little rain before sowing. Test weights did not differ among herbicides or tillage systems in the year with significant rain a few days before seeding.

Keywords

Dicamba, 3,6-dichloro-2-methoxybenzoic acidglyphosate, N-(phosphonomethyl)glycinepicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid2,4-D, (2,4-dichlorophenoxy)acetic acidwheat, Triticum aestivum L. ‘Daws'Conventional tillageno-tilldicambaglyphosatepicloram 2,4-DCONAR
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 291 - 296
Copyright
Copyright © 1991 Weed Science Society of America 

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References

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