Time effect of wild oat removal on winter wheat yield Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sq87bx167

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  • Wild oat removal on winter wheat yield
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  • The extent of the competitive effect of wild oats on winter wheat yield was estimated in field studies on three commercial wheat farms in the Willamette Valley. The morphological development of the wild oat plants was also documented. Wild oats were removed from stands of wheat in six different treatments; hand-weeded once at three different growth stages, treatment with barban, continuous hand weeding, and barban plus continuous hand weeding. Continuous weeding and continuous weeding plus barban most effectively reduced wild oat competition in two locations where Nugaines was the wheat variety. Spraying barban alone or hand weeding once at any certain stage was not as effective. The effect of wild oat was expressed in reducing tillering of wheat in one location and in reducing tillering and reducing seed weight in another location. Some wild oats were emerging most of the time from the beginning of the season (November 1969) until May 1970. Emergence terminated in late May and June but it was noticed in July after harvest. There were two main waves of emergence; the first one was at the beginning of the winter season and the other was during spring. Tillering of the winter emerging plants started in late February 1970. The plants in the second emergence wave hardly developed tillers. Heading for both emergence waves was in June 1970. The wild oat plants which emerged when the crop germinated were much more vigorous than the late-emerging plants. When growing in association with Druchamp wheat, wild oat plants were weak due to the vigor and early development of the wheat crop.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-01-30T14:18:45Z (GMT) No. of bitstreams: 1 AbuIrmailehBarakat1971.pdf: 3100986 bytes, checksum: b60d2f7180e9687c3512c25ff65ee6c7 (MD5)
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