Objective:       

To evaluate winter wheat varieties and experimental lines for agronomic performance in environments and cropping systems representative of northwestern Montana.    

Results:           

Winter wheat yields averaged 115.0 bu/A, and ranged from to 59.5 bu/A for Jerry to 154.6 bu/A for MT1354 (Table 2). Stripe rust was prevalent in the nursery, with an average infection level of 40.7% and ranged from 3.7% for MT0978 to 96.7% for WB4059CLP. Days to fifty percent heading averaged 153 days (June 2) and ranged from 147 days (May 27) for Freeman and T158 to 157 days (June 6) for WB3768. Height averaged 38.2 inches and ranged from 28.8 inches for WB4059CLP to 50.6 inches for MTF1232. No lodging was observed in the entire nursery.  Percent protein averaged 9.9% and ranged from 9.0% for MT 1332 and MT1286 to 11.4% for Brawl CL Plus.

Summary:       

Despite unseasonably low levels of precipitation, significant stripe rust pressure was prevalent. In conclusion an inverse relationship exists between percent yield loss as a function of percent stripe rust infection (Graph 1).

 

Table 1. Materials and Methods
Seeding Date: 9/29/2014 Harvest Date: 7/29/2015
Julian Date: 272 Julian Date: 210
Seeding Rate: 100 lb/A Soil Type: Creston SiL
Previous Crop: Canola Soil Test: 29-10-158
Tillage: Conventional Fertilizer: 9-40-70, 130-0-0 TD
Irrigation: None Herbicide: Huskie 11 oz/A

 

Scatter plot showing the yield loss as a function of stripe rust infection

 

Table 2. Agronomic data
  HD SR HT YLD¹ PRO² TWT¹
Cultivar Julian % in bu/A % lb/bu
MT1354 154 14.3 40.1 154.6 10.0 63.0
Colter 155 20.0 41.6 151.2 9.9 62.3
CDC Chase 155 28.3 41.2 149.7 10.1 62.3
MT1332 154 13.7 39.4 144.8 9.0 62.0
MTS1224 154 6.7 36.9 144.7 9.7 62.4
MT1257 153 22.7 39.9 144.3 10.1 61.9
MT1138 154 23.3 40.6 143.5 9.5 62.3
MTCL1131 155 18.7 42.1 140.6 10.2 62.9
Yellowstone 153 21.3 40.7 140.5 9.7 62.3
MT1265 155 21.0 41.4 139.9 9.3 61.3
MT1078 153 31.7 37.7 139.0 9.2 61.3
MT1117 154 17.7 40.3 138.8 9.8 62.7
WB3768 157 16.7 43.5 135.8 9.6 62.7
MT1348 152 16.0 36.1 132.9 9.7 63.4
Warhorse 154 4.0 38.7 132.4 11.0 62.3
SY Clearstone 2CL 154 16.3 40.2 132.0 10.4 62.3
MT0978 154 3.7 38.9 130.8 10.5 62.1
WB-Quake 153 10.0 37.7 127.5 9.6 62.8
MTCL1329 152 32.0 36.3 126.3 10.0 63.0
MTS0826-63 155 12.7 41.5 126.1 10.1 63.4
Judee 153 9.0 37.8 125.4 9.9 63.0
MT1361 155 16.7 34.5 123.7 9.8 62.1
Keldin 153 33.0 35.6 122.3 9.8 63.1
SY Monument 151 19.7 37.0 121.5 9.2 61.6
Freeman 147 51.7 38.4 120.3 9.4 61.2
LCS Mint 150 25.0 38.2 119.4 9.7 63.9
T158 147 21.3 35.2 119.0 10.1 63.2
WB4623CLP 153 13.3 35.4 115.9 10.9 63.2
MT1286 155 77.7 39.2 113.5 9.0 62.0
06BC796#68 150 32.7 31.8 111.3 9.9 63.6
MTF1232 156 52.7 50.6 109.4 10.1 63.1
MTCS1204 155 46.7 38.6 108.2 10.4 62.4
WB4614 153 44.3 33.2 106.9 9.8 62.4
SY Wolf 151 20.7 32.7 105.7 9.6 62.6
Ledger 153 67.3 36.0 104.6 9.9 63.4
Rampart 153 61.3 41.8 101.0 9.5 62.6
MTS1305 152 32.3 34.0 100.7 9.5 62.6
Denali 152 82.7 38.9 94.2 10.1 60.8
Cowboy 152 91.7 35.2 91.7 10.1 59.5
Brawl CL Plus 148 74.3 35.6 90.5 11.4 60.9
CDC Falcon 153 60.3 32.1 89.2 9.9 61.3
Byrd 150 87.3 36.6 86.0 9.1 59.8
Bearpaw 153 75.7 37.4 81.2 10.4 58.7
LCH 10-13 151 93.0 39.9 76.7 10.5 61.7
Decade 152 90.3 36.1 69.3 9.5 58.7
Broadview 154 86.0 36.4 67.3 11.2 56.5
Genou 154 91.3 43.1 65.0 10.1 60.9
WB4059CLP 148 96.7 28.8 61.6 10.9 60.4
Jerry 154 91.3 44.8 59.5 9.5 57.4
Mean 153 40.7 38.2 115.0 9.9 61.9
LSD 1.5 17.0 3.2 12.4 . .
HD: heading, SR: stripe rust ,HT: height, YLD: yield, PRO: protein, TWT: test weight
¹YLD and TWT adjusted to 13% moisture, ²PRO adjusted to 12%