berseem clover (Trifolium alexandrium), corn (Zea mays), crop rotation, narrow strip intercropping, oat (Avena sativa), ridge-till, seedbank, soybean (Glycine max), weed emergence
Weed populations in agronomic settings are, in part, a reflection of the cropping system utilized. The goal of this project was to gain an understanding of the weed population dynamics in a narrow strip intercropping (NSI) rotation by assessing the weed seedbank, weed emergence, and seedling establishment over the growing season for a corn-soybean (two-crop), and a corn-soybean-oat+berseem clover (three-crop) system. Field research was conducted in 1994 and 1995, near Nashua, IA, and each crop was grown m 4.6 m wide strips. Giant foxtail and total weed seed densities were significantly lower in the three-crop NSI rotation system than in the two-crop system. NSI rotation system affected total preplant weed emergence. Preplant density ranged from 103 to 433 weeds m-2 in the two-crop system, while density ranged from 3 to 99 weeds m-2 in the three-crop system. There were no consistently significant differences in weed seedling emergence after crop planting due to NSI rotation system when individual species were examined. Changes in Iowa cropping systems may result from a better understanding of these system dynamics.
Journal of the Iowa Academy of Science
© Copyright 2000 by the Iowa Academy of Science, Inc.
Wright, Shawn R.; Buhler, Douglas D.; Kohler, Keith A.; and Cruse, Richard M.
"Weed Seedbanks and Seedling Emergence in a Two and Three Crop Narrow Strip Intercropping/Rotation System,"
The Journal of the Iowa Academy of Science: JIAS: Vol. 107:
, Article 5.
Available at: http://scholarworks.uni.edu/jias/vol107/iss1/5