Submitted to: North Central Weed Science Society US Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: December 5, 2002
Publication Date: December 5, 2002
Citation: PETERSON, D.H., SCURSONI, J., FORCELLA, F. WEED DIVERSITY AND YIELD IN GLYPHOSATE-TOLERANT SOYBEAN FROM MINNESOTA TO LOUISIANA. NORTH CENTRAL WEED SCIENCE SOCIETY. 2002. V. 57: ABSTRACT P. 129. Technical Abstract: The use of genetically modified crops in agricultural production is of great concern, particularly in Europe. The concern is the use of this technology and its impact on species biodiversity, not only in weeds, but also in the animal communities that utilize these plant species. Our objectives were to examine trends in yield and weed diversity (alpha, beta and gamma diversity) along an environmental/ latitudinal transect from Minnesota to Louisiana and to compare several herbicide management treatments in glyphosate-tolerant soybean production. Herbicide treatments included: (a) weedy check, (b) one-pass glyphosate, (c) two-pass glyphosate, (d) standard Pre + glyphosate, and (e) standard Pre + Post. Yield data suggest that farmers can maintain high yields and high species biodiversity better with a one-pass glyphosate treatment, but only at high latitudes. Once below 40 deg N latitude, yields in one-pass glyphosate decrease by about 10% and continue to decrease by about 2% for each degree of latitude. Analyses of effective species richness for the years 2001 and 2002 indicate that rankings of weed diversity across treatments did not change substantially among locations.