Skip to main content Accessibility help

Canola (Brassica rapa) Plant Density Influences Tartary Buckwheat (Fagopyrum tataricum) Interference, Biomass, and Seed Yield

  • John T. O'Donovan (a1)


Field experiments were conducted at Vegreville, Alberta, in 1990, 1991, and 1992 to investigate the influence of canola plant density and row spacing (1991 and 1992 only) on interference from Tartary buckwheat. Nonlinear regression equations incorporating both canola and Tartary buckwheat density provided good descriptions of the data. Parameter estimates for both weed and crop density were significant (P < 0.05) but did not differ between row spacings. Where no Tartary buckwheat plants were present, canola yield was little affected by canola plant density. At a given Tartary buckwheat density, canola seed yield increased as canola plant density increased, while Tartary buckwheat shoot weight and seed yield decreased. None of the factors significantly affected canola 1000-seed weight, or oil or protein levels in the canola seed. The results suggest that seeding canola to achieve a density of approximately 200 plants m–2 will significantly reduce the impact of weeds on canola yield, as well as reduce weed biomass and seed yield.



Hide All
1. Andersson, B. 1986. Influence of crop density and spacing on weed competition and grain yield in wheat and barley. Pages 121128 in Proc. Eur. Weed Res. Symp.
2. Anonymous. 1985. Canola production in Alberta. Agdex 149/20–1 31 pp.
3. Barton, D. L., Thill, D. C., and Bahman, S. 1992. Integrated wild oat (Avena fatua) management affects spring barley (Hordeum vulgare) yield and economics. Weed Technol. 6:129135.
4. Carlson, H. L. and Hill, J. E. 1985. Wild oat (Avena fatua) competition in spring wheat: Plant density effects. Weed Sci. 33:176181.
5. Christensen, J. V. and Drabble, J. C. 1984. Effect of row spacing and seeding rate on rapeseed yield in Northwest Alberta. Can. J. Plant Sci. 64:10111013.
6. Clarke, J. M., Clarke, F. R., and Simpson, G. M. 1978. Effect of method and rate of seeding on yield of Brassica napus . Can. J. Plant Sci. 58:549550.
7. Clarke, J. M. and Simpson, G. M., 1978. Influence of irrigation and seeding rates on yield and yield components of Brassica napus cv. Tower. Can. J. Plant Sci. 58:731737.
8. Cousens, R. 1985. An empirical model relating crop yield to weed and crop density and a statistical comparison with other models. J. Agric. Sci. (Camb.) 105:513521.
9. Cudney, D. W., Jordan, L. S., Holt, J. S., and Reints, J. S. 1989. Competitive interactions of wheat (Triticum aestivum) and wild oats (Avena fatua) grown at different densities. Weed Sci. 37:538543.
10. Degenhardt, D. F. and Kondra, Z. P. 1981. The influence of seeding date and seeding rate on seed yield and yield components of five genotypes of Brassica napus . Can. J. Plant Sci. 61:185190.
11. de St. Remy, E. A., O'Donovan, J. T., Tong, A. K. W., O'Sullivan, P. A., Sharma, M. P., and Dew, D. A. 1985. Influence of Tartary buckwheat (Fagopyrum tataricum) density on yield loss of barley (Hordeum vulgare) and wheat (Triticum aestivum). Weed Sci. 33:521523.
12. de St. Remy, E. A. and O'Sullivan, P. A. 1986. Duration of Tartary buckwheat (Fagopyrum tataricum) interference in several crops. Weed Sci. 34:281286.
13. Evans, R. M., Thill, D. C., Thapia, L. S., Shafii, B., and Lish, J. M. 1991. Wild oat (Avena fatua) and spring barley (Hordeum vulgare) density affect spring barley grain yield. Weed Technol. 5:3339.
14. Hume, L. 1985. Crop losses in wheat (Triticum aestivum) as determined using weeded and nonweeded quadrats. Weed Sci. 33:734740.
15. Kondra, Z. P. 1977. Effect of planted seed size and seeding rate on rapeseed. Can. J. Plant Sci. 57:277280.
16. Kondra, Z. P. 1975. Effect of row spacing and seeding rate on rapeseed. Can. J. Plant Sci. 55:339341.
17. Koutsoyiannis, A. 1977. Pages 8191 in Theory of Econometrics. 2nd ed. MacMillan Education, Ltd., London, U.K.
18. Lawson, H. M. 1983. Competition between annual weeds and vining peas grown at a range of population densities. Weed Res. 22:2738.
19. McGregor, D. I. 1987. Effect of plant density on development and yield of rapeseed and its significance to recovery from hail injury. Can. J. Plant Sci. 67:4351.
20. Morrison, M. J., McVetty, P. B. E., and Scarth, R. 1990. Effect of row spacing and seeding rate on summer rape in southern Manitoba. Can. J. Plant. Sci. 70:127137.
21. O'Donovan, J. T., Kirkland, K. J., and Sharma, A. K. 1989. Canola yield and profitability as influenced by volunteer wheat infestations. Can. J. Plant Sci. 69:12351244.
22. O'Donovan, J. T., Sharma, A. K., Kirkland, K. J., and de St. Remy, E. A. 1988. Volunteer barley interference in canola (Brassica campestris and B. napus). Weed Sci. 36:734739.
23. Orwick, P. L. and Schreiber, M. M. 1979. Interference of redroot pigweed (Amaranthus retroflexus) and robust foxtail (Setaria viridis var. robustaalba or var. robusta-purpurea) in soybeans (Glycine max). Weed Sci. 27:665674.
24. Robertson, J. A. and Morrison, W. H. III. 1974. Analysis of oil content of sunflower seed by wide line NMR. JAOCS 56:911964.
25. Sims, R. E. H. 1976. Effects of planting pattern and sowing method on the seed yield of safflower, oilseed rape and lupin. N.Z. J. Exp. Agric. 4:185189.
26. Statistical Analysis System Institute, Inc. 1987. SAS/STA™ guide for personal computers. Version 6 ed. SAS Inst., Inc., Cary, NC. 1028 pp.
27. Teasdale, J. R. and Frank, J. R. 1983. Effect of row spacing on weed competition with snap beans (Phaseolus vulgaris). Weed Sci. 31:8185.
28. Thomas, P. 1984. Pages 811812 in Canola Growers Manual. Canola Council of Canada Publ., Winnipeg, Manitoba, Canada.


Canola (Brassica rapa) Plant Density Influences Tartary Buckwheat (Fagopyrum tataricum) Interference, Biomass, and Seed Yield

  • John T. O'Donovan (a1)


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