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Weed Seed Decline in Irrigated Soil after Six Years of Continuous Corn (Zea mays) and Herbicides

Published online by Cambridge University Press:  12 June 2017

Edward E. Schweizer  and
Robert L. Zimdahl
Edward E. Schweizer
Affiliation:
U.S. Dep. Agric., Crops Res. Lab., and Prof., Dep. Bot. and Plant Pathol., Colorado State Univ., Fort Collins, CO 80523
Robert L. Zimdahl
Affiliation:
U.S. Dep. Agric., Crops Res. Lab., and Prof., Dep. Bot. and Plant Pathol., Colorado State Univ., Fort Collins, CO 80523
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Abstract

The impact of two weed management systems on the weed seed reserves of the soil, on the yearly weed problem, and on corn (Zea mays L.) production was assessed where corn was grown under furrow irrigation for 6 consecutive years. In one system, 2.2 kg/ha of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] was applied annually to the same plots as a preemergence treatment. In the other system, a mixture of 1.7 kg/ha of atrazine plus 2.2 kg/ha of alachlor [2-chloro-2′,6′-diethyl-N-(methoxymethyl)acetanilide] was applied preemergence, followed by a postemergence application of 0.6 kg/ha of the alkanolamine salts of 2,4-D [(2,4-dichlorophenoxy)acetic acid]. The response of weeds and corn is presented only where atrazine was applied annually because the results were similar between both weed management systems. Weed seeds from eight annual species were identified, with redroot pigweed (Amaranthus retroflexus L. ♯ AMARE) and common lambsquarters (Chenopodium album ♯ CHEAL) comprising 82 and 12%, respectively, of the initial 1.3 billion weed seeds/ha that were present in the upper 25 cm of the soil profile. After the sixth cropping year, the overall decline in the total number of redroot pigweed and common lambsquarters seeds was 99 and 94%, respectively. Very few weeds produced seeds during the first 5 yr, and no weed seeds were produced during the sixth year where atrazine was applied annually. When the use of atrazine was discontinued on one-half of each plot at the beginning of the fourth year, the weed seed reserve in soil began to increase due to an increase in the weed population. After 3 yr of not using atrazine, the weed seed reserve in soil had built up to over 648 million seeds/ha, and was then within 50% of the initial weed seed population. In the fifth and sixth years, grain yields were reduced 39 and 14%, respectively, where atrazine had been discontinued after 3 yr.

Keywords

Weed management systemsseed banksatrazineAmaranthus retroflexus ♯ AMAREChenopodium album ♯ CHEAL
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 32 , Issue 1 , January 1984 , pp. 76 - 83
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

Literature Cited

1. Brenchley, W. E. and Warington, K. 1945. The influence of periodic fallowing on the prevalence of viable weed seeds in arable soil. Ann. Appl. Biol. 32:285–296.CrossRefGoogle Scholar
2. Burnside, O. C., Fenster, C. R., Evetts, L. L., and Mumm, R. F. 1981. Germination of exhumed weed seed in Nebraska. Weed Sci. 29:577–586.CrossRefGoogle Scholar
3. Chancellor, R. J. 1979. The long-term effects of herbicides on weed populations. Ann. Appl. Biol. 91:141–144.Google Scholar
4. Delorit, R. J. 1970. An illustrated taxonomy manual of weed seeds. Agronomy Publications, Riverfalls, WI. 175 pp.Google Scholar
5. Dowler, C. C., Hauser, E. W., and Johnson, A. W. 1974. Cropherbicide sequences on a Southeastern Coastal Plain soil. Weed Sci. 22:500–505.Google Scholar
6. Dunham, R. S., Robinson, R. G., and Andersen, R. N. 1958. Crop rotation and associated tillage practices for controlling annual weeds in flax and reducing the weed seed population of the soil. Minn. Agric. Exp. Stn. Tech. Bull. 230, 20 pp.Google Scholar
7. Lybecker, D. W., King, R. P., Schweizer, E. E., and Zimdahl, R. L. 1983. Economic analysis of two weed management systems for two cropping rotations. Weed Sci. 32:90–95.Google Scholar
8. Malone, C. R. 1967. A rapid method for enumeration of viable seeds in soil. Weeds 15:381–382.Google Scholar
9. Parshall, M. 1961. Meterological Data, 1887–1957. Colo. Agric. Exp. Stn. Bull. 5095, 17 pp.Google Scholar
10. Roberts, H. A. 1962. Studies on the weeds of vegetable crops. II. Effect of six years of cropping on the weed seeds in the soil. J. Ecol. 50:803–813.CrossRefGoogle Scholar
11. Roberts, H. A. 1968. The changing population of viable weed seeds in arable soil. Weed Res. 8:253–256.CrossRefGoogle Scholar
12. Roberts, H. A. and Neilson, J. E. 1981. Changes in the soil seed bank of four long-term crop/herbicide experiments. J. Appl. Ecol. 18:661–668.Google Scholar
13. Robinson, R. G. 1949. Annual weeds, their viable seed population in the soil and their effect on yields of oats, wheat, and flax. Agron. J. 41:513–518.Google Scholar
14. Shaw, W. C. and Jansen, L. L. 1972. Chemical weed control strategies for the future. Pages 197–215 in Pest Control Strategies for the Future. Nat. Acad. Sci., Washington, DC.Google Scholar
15. Stevens, O. A. 1932. The number and weight of seeds produced by weeds. Am. J. Bot. 19:784–794.Google Scholar
16. Wilson, B. J. 1981. The influence of reduced cultivations and direct drilling on the long-term decline of a population of Avena fatua L. in spring barley. Weed Res. 21:23–28.Google Scholar