Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 1993-1995
3 Fluid Journal Spring 1994 Figure 1. Reduced risk of pesticide movement, Dana Hoag, Colorado State University. approach to pesticide usage has reduced the risk of pesticide movement from its acreage to surface and ground water. Battling weed resistance The use of sulfonylurea herbicides at Open Grounds (Classic and Pinnacle in soybeans, Harmony Extra in winter wheat, and Accent in corn) has raised concern about targeted weeds developing resistance to these herbicides. One preventative measure used by Open Grounds is to rotate crops annually. Another uses sulfonylurea herbicides only in tank mixes or in sequence with other herbi-cides possessing a different mode of action. The farm's mid-February use of sub-lethal, preplant Roundup rates to control winter vegetation has expedited implementation of a herbicide rotation strategy while reducing herbicide and tillage costs. Efforts to prevent the rise of herbicide-resistant weeds have been further assisted by the short half-life of sulfonylurea herbicides in acid soils (typically pH 5.0), as well as the farm's use of economic thresholds that encourage a favorable ratio of susceptible to potentially resistant weeds. Opportunity The search continues for new technologies, environmental improvements, cost culling, and improved profits. Contrary to conventional wisdom, Open Grounds successfully no-tills approximately half its corn acreage, even into soils classified as poorly drained. Improved N and P placement has contributed significantly to the farm's emergence as a regional leader in conservation tillage. Cotton was recently evaluated in a 500-acre experiment. It was dropped because weeds could not be managed economically on organic soils. Being considered are new ditch bank management techniques that reduce mowing costs and enhance wildlife populations. Ongoing are efforts to find ways of slowing fresh water movement from farmlands to estuaries following spring rains. Open Grounds cooperates with North Carolina State University, Duke University, the University of Minnesota, the University of North Carolina and the Environmental Protection Agency. Dr. Anderson is professor of Crop Science at North Carolina State University in Raleigh, NC, and Gabriele Onorato is pest management coordinator at Open Grounds Farms, Inc. of Beaufort, NC.
Fluid Journal 1996-1998