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- Title
Yield losses in weed-free wheat and barley due to post-emergence herbicides.
- Authors
Elliott, B. R.; Lumb, J. M.; Reeves, T. G.; Telford, T. E.
- Abstract
The tolerance of weed-free wheat and barley to a range of herbicides (bromoxynil, methabenzthiazuron, MCPA, bromoxynil+MCPA, linuron, prometryne, diuron, 2,4-D ester and 2,4-D amine) when applied at the crop three-leaf stage, was examined over the 5-year period 1968-72. All chemicals lowered grain yields to some extent, but the variation between chemicals was greater for wheat than for barley. In both crops, methabenzthiazuron was the safest chemical causing only small (< 2.0%) yield losses at rates up to 2.25 kg a.i./ha. At this rate of application yield losses of up to 36% were recorded for the substituted urea derivatives. Both crops had a low tolerance to 2,4-D ester and amine. Yield lasses from bromoxynil, bromoxynil+MCPA and MCPA were similar, varying from 4 to 8% at 0.5 kg a.i./ha to 9-24% at 2.25 kg a.i./ha.
- Subjects
WEED control; WHEAT; BARLEY; HERBICIDES; MCPA (Herbicide); DIURON; AMINES; CHEMICALS
- Publication
Weed Research, 1975, Vol 15, Issue 2, p107
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1975.tb01107.x