Wednesday, 9 November 2005
7

Yield Response of Varying Seeding Rates and Mixtures of Traditional and Herbicide Resistant Soybeans.

Maria Labreveux, Delaware State University, 1200 North Dupont Highway, Dover, DE 19901, Richard Taylor, University of Delaware, Univ of DE-Dept of Plnt & Soil Sci, 531 South College Ave, Newark, DE 19716-2170, and Robert Kratochvil, University of Maryland, 1112B, H. J. Patterson Hall, College Park, MD 20742.

The search for alternatives to reduce soybean production costs has led researchers and farmers to propose the use of traditional and herbicide resistant seed blends at planting. In addition to reducing seed costs, increasing plant densities may help improve weed suppression in early crop stages. Experiments comparing 17 blends of traditional and herbicide resistant seeds were conducted at four sites in the Delmarva Peninsula. Sites were located near the Maryland eastern shore, and an additional three were distributed from Northern to Southern Delaware. Blends consisted of densities between one half and double the recommended final plant densities, with increasing proportions of traditional seeds. Sites were seeded with a plot drill in May and harvested in October 2004. Yield and yield components data were collected. Weather conditions in the year of experiment were atypical both in terms of precipitation and radiation levels. Yield results suggest that the common practice of increasing the recommended seeding rate from 155k to 222k seeds acre-1 does not provide an advantage in yield, even during a year when rainfall is not limiting. Additionally, there are indications that an initial seeding rate of 155K composed of 10 percent traditional seed could produce similar yields to that obtained with 100 percent herbicide resistant seed. Utilizing such a blend could reduce costs by $5.5 per acre. Additional replications over time are being conducted to ensure repeatability of results with varying weather conditions.

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