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Seed bank characterization and emergence of a weed community in a moldboard plow system

Published online by Cambridge University Press:  12 June 2017

Dawit Mulugeta  and
David E. Stoltenberg
Dawit Mulugeta
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
David E. Stoltenberg
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI; [email protected]
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Abstract

Field experiments were conducted in 1992 and 1993 to characterize the weed seed bank, to determine the influence of moldboard plowing and secondary soil disturbance on the emergence pattern of weeds, and to measure weed seed bank depletion by emergence in a long-term moldboard plow corn cropping system. Viable seeds of common lambsquarters, redroot pigweed, and each of 10 other species accounted for about 85, about 9, and less than 1%, respectively, of the total weed species in the seed bank. A negative binomial distribution described the spatial distribution of viable seeds of 10 species, but not of common lambsquarters or of redroot pigweed. Decreased density of seeds among species was associated with increased aggregation. Secondary soil disturbance increased the rate and magnitude of common lambs quarters emergence in 1992 but did not influence emergence in 1993. Secondary soil disturbance did not influence the magnitude and rate of emergence of redroot pigweed or velvetleaf. Whereas cumulative growing degree days from April through July were similar between years, the amount of rainfall was about 50% less in 1992 than in 1993. Secondary soil disturbance may have increased common lambsquarters emergence by increasing the availability of soil moisture and improving conditions for seed germination during the dry year. Even though seed bank depletion by seedling emergence was relatively low for all species, secondary soil disturbance in creased seed bank depletion of common lambsquarters and redroot pigweed about 7- and 3-fold, respectively, in 1992. Seasonal variation in the amount of rainfall may have influenced the effect of soil disturbance on emergence and seed bank depletion of common lambsquarters, which is the most abundant species in the weed community.

Keywords

Dispersion indicesgrowing degree daysnegative binomialrainfallsecondary soil disturbanceseed distributionABUTHAMARECHEALCommon lambsquarters, Chenopodium album L. CHEALredroot pigweed, Amaranthus retroflexus L. AMAREvelvetleaf, Abutilon theophrasti Medicus ABUTHcorn, Zea mays L. ‘Pioneer 3417’
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 1 , February 1997 , pp. 54 - 60
Copyright
Copyright © 1997 by the Weed Science Society of America 

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