2001 Annual Report Agronomy Section

Dickinson Research Extension Center 1089 State Avenue Dickinson, ND 58601

Tillage and Seeding Rate Effects on Wheat Varieties

Patrick M. Carr, Richard D. Horsley, Woodrow W. Poland, and G. B. Martin
North Dakota State University
Dickinson Research Extension Center
Dickinson, ND
Department of Plant Science
Fargo, ND

Summary

Conservation systems are expanding in major wheat producing regions. Variety recommendations generally are based on adaptation trials in conventional-tillage systems. Our objectives were to determine if tillage affected vegetative and reproductive growth of hard red spring wheat (Triticum aestivum L. emend. Thell.) varieties in a wheat-fallow monoculture, and to determine if planting rate adjustments were needed for optimum reproductive growth as tillage was reduced. Five varieties each were seeded at 11, 22, and 33 PLS/ft² in conventional-, reduced-, and no-tillage plots over a 4-yr period at Dickinson, North Dakota. A randomized and replicated experimental design was used to evaluate varieties, planting rates, and tillage treatments. Tillage x variety, tillage x seeding rate, and tillage x seeding rate x variety interactions did not occur for most growth parameter measured (P < .05). Results of this study suggest that variety recommendations based on trials in conventional-tillage systems may be appropriate for variety selection in conservation-tillage systems.

Three papers describing this study are under preparation or review for publication in scientific journals and will be summarized in future press releases.

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