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- Mercer, Kristin L.; Jordan, Nicholas R.; Wyse, Donald L.; Shaw, Ruth G.
- Weed science 2002 v.50 no.5 pp. 677-685
- 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
- ... 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 ...
- Liu, Zhuojing; Clay, Sharon A.; Clay, David E.
- Weed science 2002 v.50 no.5 pp. 662-671
- Zea mays; alachlor; atrazine; biomass; corn; correlation; half life; landscapes; mineralization; soil heterogeneity; sorption; weed control; weeds; South Dakota
- ... Landscape-induced differences in soil variability and other parameters have potential effects on herbicide sorption, persistence, degradation, and, ultimately, efficacy. This study examined the spatial variability of herbicide efficacy across an eastern South Dakota field in continuous corn. Atrazine and alachlor had been applied for the previous 10 yr. The spatial variability observed in weed con ...