2002 Annual Report

Agronomy Section

Dickinson Research Extension Center
1089 State Avenue
Dickinson, ND 58601

Tillage and Seeding Rate Effects on Wheat Cultivars
II. Yield Components

Patrick M. Carr1, Richard D. Horsley2, and Woodrow W. Poland1
North Dakota State University
Dickinson Research Extension Center1
Department of Plant Sciences2

Research Summary

Tillage is declining in wheat production systems. Our objectives were to determine if tillage x cultivar, seeding rate x cultivar, and tillage x seeding rate x cultivar interactions occurred for the yield components of hard red spring wheat (Triticum aestivum L. emend. Thell.) in a wheat-fallow monoculture. The cultivars AC Minto, Amidon, Bergen, Grandin, and Norm were seeded at 123, 247, and 371 kernels m-2 in conventional-till (CT), reduced-till (RT), and no-till (NT) systems in a randomized complete block in a split split-plot arrangement during 1994-1998. Tillage x cultivar and tillage x seeding rate x cultivar interactions did not occur for any yield component. A seeding rate x cultivar interaction occurred for both plant stand and tiller production, but the interaction resulted from a change in the magnitude of response and not in the ranking of cultivars to seeding rate adjustments for either yield component. Plant stand and the number of tillers plant-1 were not affected by tillage systems consistently, but the number of spike-bearing tillers increased from 411 m-2 under CT to 457 m-2 under NT (P < 0.05). Tillage systems did not affect the number of kernels spike-1. Kernel weight declined as tillage was reduced in two of four years. More spike-bearing tillers m-2 occurred as the seeding rate increased, but there was a negative quadratic response in the number of tillers plant-1 and a decrease in the number of kernels spike-1. Results of this study indicate that the ranking of contrasting hard red spring wheat cultivars for yield components is unchanged by reductions in tillage in a wheat-fallow monoculture.

This paper has been submitted for publication in a scientific journal and will be summarized in future press releases.

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