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Velvetleaf (Abutilon theophrasti) Seed Populations in Six Continuous-Corn (Zea mays) Fields

Published online by Cambridge University Press:  12 June 2017

K. D. Khedir  and
Fred W. Roeth
K. D. Khedir
Affiliation:
Dep. Agron., University of Nebraska South Central Station, Clay Center, NE 68933
Fred W. Roeth
Affiliation:
Dep. Agron., University of Nebraska South Central Station, Clay Center, NE 68933
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Abstract

To assess velvetleaf (Abutilon theophrasti Medic.) seed populations and trends in continuous corn (Zea mays L.), six fields were selected and sampled in August and November of 1977 and 1978 at the 0- to 10- and 10- to 20-cm depths, and at the 20- to 30-cm depth in August of both years. The overall population mean was 51 million viable velvetleaf seeds/ha in the top 20 cm of soil. Means of individual fields ranged from 34 to 88 million seeds/ha. The population mean increased 13 million (28%) from 1977 to 1978. Individual fields had increases ranging from 8 million (14%) to 24 million (112%) seeds/ha. The seed population increased 16 million (37%) from August to November in these 2 yr, and 70% of the seeds were found in the top 10 cm of soil. The 20- to 30-cm depth contained 7% (3 million) of the seed extracted in the August sampling. A comparison of techniques for estimating the number of velvetleaf seeds in a soil sample showed that wet sieving was more efficient and accurate than were soaking and sieving, dry sieving, or direct incubation and germination. Seed immersion in water at 70 C for 5 min increased velvetleaf germination from 11% to 84%, compared to 52% for sulfuric acid, 48% for scarification, and 62% for seed-coat puncture. In the greenhouse, velvetleaf control with atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] and metribuzin [4-amino-6-ten-butyl-3-(methylthio)-as-triazin-5(4H)-one] declined as the seed population increased.

Keywords

Seed samplingseed dormancyatrazinemetribuzin
Type
Research Article
Information
Weed Science , Volume 29 , Issue 4 , July 1981 , pp. 485 - 490
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

Literature Cited

1. Chandler, J. M. 1977. Competition of spurred anoda, velvetleaf, prickly sida, and Venice mallow in cotton. Weed Sci. 25:151–153.CrossRefGoogle Scholar
2. Eaton, B. J., Russ, O. G., and Feltner, K. C. 1976. Competition of velvetleaf, prickly sida, and Venice mallow in soybean. Weed Sci. 24:224–228.Google Scholar
3. Everson, L. 1974. Preliminary studies to establish laboratory methods for germination of weed seed. Proc. Assoc. Off. Seed Anal. 39:447–456.Google Scholar
4. Herr, D. E. and Stroube, E. W. 1970. Velvetleaf control as influenced by herbicide placement and seed depth. Weed Sci. 18: 459–461.Google Scholar
5. Hoffman, D. W. and Lavy, T. L. 1978. Plant competition for atrazine. Weed Sci. 26:94–99.Google Scholar
6. Lacroix, L. J. and Staniforth, D. W. 1963. Seed dormancy in velvetleaf. Weeds 12:171–174.Google Scholar
7. Lueschen, W. E. and Andersen, R. N. 1980. Longevity of velvetleaf (Abutilon theophrasti) seeds in soil under agricultural practices. Weed Sci. 28:341–346.Google Scholar
8. Mulliken, J. A. and Kust, C. A. 1970. Germination of velvetleaf. Weed Sci. 18:561–564.Google Scholar
9. Roeth, F. W. 1977. Velvetleaf control in corn with postemergence herbicides in Hamilton County, Nebraska. North Central Weed Control Conf. Res. Rep. 34:166–167.Google Scholar
10. Stoller, E. W. and Wax, L. M. 1974. Dormancy changes in fate of some annual weed seeds in the soil. Weed Sci. 22:151–154.Google Scholar
11. Toole, E. H. and Brown, E. 1946. Final results of the buried seed experiment. J. Agric. Res. (Washington, DC) 72:201–210.Google Scholar
12. Wax, L. M. 1977. Incorporation depth and rainfall on weed control in soybeans with metribuzin. Agron. J. 69:107–109.Google Scholar