Skip to main content Accessibility help

Competitive Interactions of Wheat (Triticum aestivum) and Wild Oats (Avena fatua) Grown at Different Densities

  • David W. Cudney (a1), Lowell S. Jordan (a1), Jodie S. Holt (a1) and John S. Reints (a1)


Competitive interactions of wheat and wild oats in relation to variations in plant density of both species were investigated in field studies under irrigation and added fertilizer. Competition studies included comparisons by both additive and replacement series. The additive series was used to study plant responses to competition under fixed density of wheat and increasing density of wild oats. The replacement series was used to study plant responses to competition under constant total plant density with differing proportions of wheat and wild oats. On a per plant basis, shoot dry weight and leaf area index of wild oats were less than those of wheat at anthesis. However, the replacement series experiment indicated that wheat and wild oats were equivalent in competitiveness. Relative density of wild oats gave a better regression fit for wheat yield than did absolute wild oats density (r2 values of 0.83 and 0.61, respectively). Yield of wheat grain was linearly proportional to relative density of wild oats.



Hide All
1. Blackman, G. E. and Templeman, W. G. 1938. The nature of competition between cereal crops and annual weeds. J. Agric. Sci. 28:247271.
2. Carlson, H. L. and Hill, J. E. 1985. Wild oat (Avena fatua) competition with spring wheat: plant density effects. Weed Sci. 33:176181.
3. Dew, D. A. 1972. An index of competition for estimating crop loss due to weeds. Can. J. Plant Sci. 52:921927.
4. Hamman, W. H. 1979. Field conformation of an index for predicting yield loss of wheat and barley due to wild oat competition. Can. J. Plant Sci. 59:243244.
5. Harper, J. L. 1977. The Population Biology of Plants. Academic Press, London. 892 pp.
6. Martin, M. P., Field, L. D., and Field, R. J. 1987. Competition between plants of wild oat (Avena fatua) and wheat (Triticum aestivum). Weed Res. 27:119124.
7. Martin, R. J., Cullis, B. R., and McNamara, D. W. 1987. Prediction of wheat loss due to competition by wild oat (Avena spp.). Aust. J. Agric. Res. 38:487499.
8. McGilchrist, C. A. and Trenbath, B. R. 1971. A revised analysis of plant competition experiments. Biometrics 27:659671.
9. Potter, J. R. and Jones, J. W. 1977. Leaf partitioning as an important factor in growth. Plant Physiol. 59:1014.
10. Radosevich, S. R. 1987. Methods to study interactions among crops and weeds. Weed Technol. 1:190198.
11. Radosevich, S. R. and Holt, J. S. 1984. Weed Ecology Implications for Vegetation Management. John Wiley and Sons, New York. 265 pp.
12. Willey, R. W. and Rao, M. R. 1980. A competitive ratio for quantifying competition between intercrops. Expl. Agric. 16:117125.



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed