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1. Crop rotation and tillage system effects on weed seedbanks

Author:
Cardina, John; Herms, Catherine P.; Doohan, Douglas J.
Source:
Weed science 2002 v.50 no.4 pp. 448-460
ISSN:
0043-1745
Subject:
no-tillage; Oxalis; Persicaria pensylvanica; Veronica; Capsella bursa-pastoris; hay; Euphorbia maculata; Setaria faberi; Zea mays; Glycine max; seeds; Chenopodium album; corn; species diversity; weeds; crop rotation; plant communities; oats; herbicides; soybeans; growing season; plows; Avena sativa; Amaranthus retroflexus; crops; Ohio; Pennsylvania
Abstract:
... We characterized the size and species composition of the weed seedbank after 35 yr of continuous crop rotation and tillage system treatments at two locations in Ohio. Spring seedbanks were monitored during 1997, 1998, and 1999 in continuous corn (CCC), corn––soybean (CS), and corn––oats––hay (COH) rotations in moldboard plow (MP), chisel plow (CP), and no-tillage (NT) plots where the same herbicid ...
DOI:
10.1614/0043-1745(2002)050[0448:CRATSE]2.0.CO;2

2. Multivariate differentiation of quackgrass (Elytrigia repens) from three farming systems

Author:
Mercer, Kristin L.; Jordan, Nicholas R.; Wyse, Donald L.; Shaw, Ruth G.
Source:
Weed science 2002 v.50 no.5 pp. 677-685
ISSN:
0043-1745
Subject:
Avena sativa; Elymus repens subsp. repens; Glycine max; Zea mays; arable soils; control methods; corn; evolution; farming systems; genetic variation; hay; oats; pastures; perennials; principal component analysis; risk; soybeans; weed control; weeds; Minnesota
Abstract:
... The genetic variation of quackgrass as a species and the array of environments in which it is found indicate that selection in these different environments could lead to differentiation among quackgrass populations. Yet, a highly diverse environment might not promote the genetic divergence of quackgrass if it poses contradictory selection pressures. To assess the extent of divergence among quackgr ...
DOI:
10.1614/0043-1745(2002)050[0677:MDOQER]2.0.CO;2