Competitive Effects of Wild Oat in Flax

Author:

Bell Allyn R.,Nalewaja John D.

Abstract

Wild oat (Avena fatua L.) competition severely reduced flaxseed (Linum usitatissimum L.) yield. Averaged over two locations and two fertility levels, 80 wild oat plants/sq yd reduced the yield 9.4 bu/A (60.1%) in 1964 and 160 wild oat plants/sq yd reduced the yield 21.5 bu/A (82.1%) in 1965. At Fargo, 160 wild oat plants/sq yd reduced flaxseed yield 16.1 bu/A (86.1%) in 1966. Flaxseed yield components, including bolls/sq ft, seeds/boll, plants/sq ft, and weight/1000 flaxseed were determined. Although all components were reduced by wild oat competition, a reduction in the number of branches and flax bolls/sq ft accounted for 90.7% of the yield loss. A reduction in weight/1000 seed and the number of flax plants/sq ft contributed 7.0% and 4.6% to the yield loss, respectively. Competition from wild oat also reduced flaxseed quality. The percent oil was reduced in all 3 years of the experiment. Iodine number of the oil was reduced, primarily because of an increase in oleic acid and a decrease in linolenic acid.

Publisher

Cambridge University Press (CUP)

Subject

Plant Science,Agronomy and Crop Science

Reference12 articles.

1. Flax production and climate of North Dakota and Minnesota, 1919–1937;Hooper;North Dakota Agr. Exp. Sta. Bull.,1941

2. Effect of climate on the yield and oil content of flaxseed and on the iodine number of linseed oil;Dillman;U. S. Dept. Agr. Tech. Bull.,1943

3. Reaction of small grains to various densities of wild mustard and the results obtained after their removal with 2,4-D or by hand. II. Experiments with flax;Burrows;Can. J. Agr. Sci.,1955

4. Shebeski, L. H. 1965. Report on weed research. Div. of Plant Sci., Univ. of Manitoba.

5. A COMPARATIVE STUDY OF THE GROWTH OF WILD OATS (AVENA FATUA L. AND A. LUDOVICIANA DUR.) AND OF CULTIVATED CEREALS WITH VARIED NITROGEN SUPPLY

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