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Pennsylvania Smartweed (Polygonum pensylvanicum) Interference in Soybeans (Glycine max)

  • H. D. Coble (a1) and R. L. Ritter (a1)

The effects of Pennsylvania smartweed (Polygonum pensylvanicum L.) interference in soybeans [Glycine max (L.) Merr. ‘Pickett 71’] were studied in the field under a naturally occurring weed population. Soybean seed yield was reduced an average of 13% by a density of eight Pennsylvania smartweed plants per 10 m of row. Greater yield reductions of 21, 37, and 62% resulted from full-season interference by densities of 16, 32, and 240 weeds per 10 m of row, respectively. Fewer than five weeds per 10 m of row did not significantly reduce crop yield. A natural population of 240 weeds per 10 m of row did not reduce soybean yield if the period of interference was limited to 6 weeks or less after crop emergence. However, more than 6 weeks of weed interference resulted in significant yield reduction. Conversely, if the crop was kept weed-free for a period of 4 weeks or more after emergence, seed yield was not reduced. No allelopathic interaction between the two species was observed in greenhouse studies using a recirculating nutrient solution and alternate pots of soybeans and Pennsylvania smartweed.

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1. Anderson, J. M. and McWhorter, C. G. 1976. The economics of common cocklebur control in soybean production. Weed Sci. 24:397400.
2. Barrentine, W. L. 1974. Common cocklebur competition in soybeans. Weed Sci. 22:600603.
3. Bell, D. T. and Koeppe, D. E. 1972. Noncompetitive effects of giant foxtail on the growth of corn. Agron. J. 64:321325.
4. Creel, J. M. Jr., Hoveland, C. S., and Buchanan, G. A. 1968. Germination, growth, and ecology of sicklepod. Weeds 16:396400.
5. Eaton, B. J., Feltner, K. C., and Russ, O. G. 1973. Venice mallow competition in soybeans. Weed Sci. 21:8994.
6. Hoagland, D. R. and Arnon, D. I. 1950. The water culture method for growing plants without soil. California Agric. Exp. Stn. Cir. 347. 32 pp.
7. Knake, E. L. and Slife, F. W. 1962. Competition of Setaria faberi with corn and soybeans. Weeds 10:2629.
8. Staniforth, D. W. 1965. Competitive effects of three foxtail species on soybeans. Weeds 13:191193.
9. Thurlow, D. L. and Buchanan, G. A. 1972. Competition of sicklepod with soybeans. Weed Sci. 20:379384.
10. Waldrep, T. W. and McLaughlin, R. D. 1969. Cocklebur competition and control. Soybean Farmer 3:2627, 30.
11. Weber, C. R. and Staniforth, D. W. 1957. Competitive relationships in variable weed and soybean stands. Agron. J. 49:440444.
12. Wilson, H. P. and Cole, R. H. 1966. Morningglory competition in soybeans. Weeds 14:4951.
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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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