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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