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Weed seedbank dynamics in post conservation reserve program land

Published online by Cambridge University Press:  20 January 2017

Joel Felix  and
Micheal D. K. Owen
Micheal D. K. Owen
Affiliation:
Department of Agronomy, Iowa State University, Ames, IA 50011-1101
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Abstract

The influence of tillage, crop rotation, and weed management regimes on the weed seedbank in land previously under the conservation reserve program (CRP) for 8 yr was determined from 1994 through 1997. The study was a split-plot design with four replications, two tillage systems, two crop rotations, and three weed management treatments. Eleven weed species were recorded in 1994 and 1995, and 13 in 1996 and 1997. The weed seedbank was dominated by broadleaf species. In 1994, the first year after CRP, the seed population density in the top 15 cm of the soil profile was 51,480 seeds m−2, of which 60 and 20% were pigweed and common lambsquarters. The population density of pigweed seeds in the seedbank increased over time and reached 51,670 seeds m−2 in 1996. In contrast, the seed population density for foxtail species was only 417 seeds m−2 in 1994, but it increased to 7,820 seeds m−2 in 1997. The large increase in foxtail species seed population density in the 4-yr period was mainly in the no-herbicide weed management treatment. The weed seedbank was reduced similarly by band and broadcast herbicide treatments. Tillage and crop rotation did not influence the weed seedbank or Shannon's diversity index, nor did they interact with the weed management treatments in any of the years. The weed seedbank population density varied with the years and time of soil sampling. Weed seed population densities tended to be greater in the fall but declined significantly by time of the spring sampling. The no-herbicide treatment had a more diverse weed seedbank compared with band and broadcast herbicide weed management treatments. An average of one grass and three broadleaf weed species were identified in the three weed management treatments. Band and broadcast herbicide treatments reduced the weed seedbank population density but did not affect the number of broadleaf weed species observed.

Keywords

Common lambsquartersChenopodium album L. CHEALfoxtail speciesSetaria spp.pigweed speciesAmaranthus spp.Seedbank diversityShannon's diversity indexMargalef's D MGconservation reserve program
Type
Research Article
Information
Weed Science , Volume 49 , Issue 6 , December 2001 , pp. 780 - 787
Copyright
Copyright © Weed Science Society of America 

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