TRIAL DESCRIPTION AND SUMMARY
The 1994 Uniform Regional Hard Red Spring Wheat Performance
Nursery was planted at 22 locations and harvested at all
locations in Minnesota, North Dakota, South Dakota, Montana,
Idaho, Wyoming, Wisconsin, Washington, and Canada (Table 1).
The nursery contained 32 entries, 5 checks and 27
experimentals including one sawfly resistant line. Trials
were conducted as randomized complete blocks with three
replicates. Yield data obtained from Aberdeen, Idaho, were
not used in any of the over location averages nor in the
stability parameter analysis. Data from each of 21
locations are given in Tables 2-1 to 2-21.
The highest average yielding location was Aberdeen, Idaho,
with 108 bu/A and the lowest yielding location was 27 bu/A
at Tetonia, Idaho. The average yield of all locations was
47 bu/A and four experimentals lines were in the first LSD
unit when 20 locations were combined (Table 2-22). Canadian
entries were not distributed in time to allow planting in
several western locations, and separate 18 and 15 locations
combined are also presented (Tables 2-23 and 2-24). Severe
scab attacked four locations and combined data from these
locations are presented in Table 2-25. Ten entries were in
the first LSD unit for yield when scab epidemics occurred,
but several lines, Stoa and N90-0671 had below average test
weight. Large switches in ranking among the entries were
not as obvious in the overall locations vs the scab epidemic
locations as in 1993. Apparently many of the susceptible
entries were discarded last year.
Two entries, SD3156 and SD3151, were earliest to head at 23
days after June 1, while Era and Marquis were latest to head
at 34 days. Experimentals with the highest test weight were
SD3156 followed by MN92006. Data for experimentals and
checks grown for two years are given in Table 3-1. N90-
0671, SD0010, and N90-0666 were in the first LSD unit. The
highest test weight entries were ND678 and ND674, both at 59
lb/bu or higher.
Stability parameters for entries in 1994 are given in Table
3-2. A lower b value probably indicated less loss of yield
in the lower yielding environments, several which had scab.
High deviations were noted for BW174, BW688, SD3151, Era,
and Chris. Several other entries with higher deviations
were BW173, N89-0562, SBE0050, SD3156, and Marquis.
Greenhouse seedling and adult plant field reactions to stem
and leaf rust are shown in Tables 4-1 through 4-3. Scab
reaction from field inoculation is given in Table 4-4.
Table 1. Locations and comparative plot management for 1994.
Date Date Area Area Yield Yield
seeded harvested planted harvested CV% Mean
Minnesota
St. Paul Apr 18 Jul 29 48 32 10.9 45.1
Morris - - 48 32 14.7 29.9
Crookston Apr 18 48 16 11.7 36.1
North Dakota
Prosper May 9 Aug 18 36 36 11.8 27.8
Langdon Apr 29 Aug 22 56 16 9.3 53.0
Carrington May 2 Aug 19 88 54 6.3 55.6
Dickinson Apr 22 Aug 15 56 56 14.6 46.5
Williston May 5 Aug 15 - 56 5.0 47.3
Minot Apr 20 - 36 36 5.3 58.0
South Dakota
Brookings Apr 21 Aug 6 80 70 6.6 35.0
Selby Apr 13 Aug 3 80 70 3.9 54.1
Groton Apr 18 Aug 4 80 70 5.7 48.3
Montana
Havre May 3 Aug 11 - 48 7.6 29.4
Sidney Apr 21 Aug 9 - 20 8.3 61.6
Bozeman Apr 21 Aug 16 - 32 8.1 72.3
Wyoming
Powell Apr 14 Aug 26 29.25 29.25 10.8 79.6
Wisconsin
Madison Apr 21 Aug 4 40 16 11.6 32.7
Idaho
Tetonia May 4 Aug 22 - 43.3 13.4 26.9
Aberdeen Mar 29 Aug 19 - 34.4 19.8 107.7*
Washington
Pullman Apr 4 Aug 4 90 72 8.0 56.2
Canada
Swift Current May 9 - - 29.52 7.8 45.4
Winnipeg *
* Locations not included in the over-location analysis.