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a North Dakota State Univ., Dickinson Res. Ext. Ctr., 1089 State Ave., Dickinson, ND 58601
b Dep. Plant Sci., North Dakota State Univ., Fargo, ND 58105
* Corresponding author (pcarr{at}ndsuext.nodak.edu)
Tillage is declining in wheat production systems in the Great Plains. Our objective was to determine if a tillage x cultivar interaction occurred for grain yield, protein concentration, kernel weight, and test weight for hard red spring wheat (Triticum aestivum L. emend. Thell.) in a wheat–fallow monoculture. We also wanted to know if seeding rate x cultivar and tillage x seeding rate x cultivar interactions occurred for these grain traits. The cultivars AC Minto, Amidon, Bergen, Grandin, and Norm were seeded at 123, 247, and 371 live kernels m-2 in conventional-till (CONT), reduced-till (RT), and no-till (NT) systems in a randomized complete block with a split split-plot arrangement in southwestern North Dakota during 1995–1998. Tillage x cultivar, seeding rate x cultivar, and tillage x seeding rate x cultivar interactions did not occur for any grain trait (P > 0.05). Grain yield, protein concentration, kernel weight, and test weight were unaffected by tillage system. A positive quadratic response in grain yield occurred as the seeding rate was increased. Grain test weight increased from 577 to 586 g m-3 as the seeding rate increased from 123 to 371 kernels m-2, but grain protein concentration and kernel weight were unaffected. Grain yield ranged from 2473 to 3063 kg ha-1, crude protein from 141 to 154 g kg-1, kernel weight from 30 to 32 g (1000 kernels)-1, and test weight from 572 to 590 g m-3 among the five cultivars. Results of this study suggest that cultivar recommendations under CONT can be extended to RT and NT systems in a wheat-fallow monoculture.
Abbreviations: HRSW, hard red spring wheat • CONT, conventional-till • RT, reduced-till • NT, no-till
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