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Identifying Isoyield Environments for Field Pea Production

^a Alberta Agriculture, Food and Rural Development, Room 300, 7000–113 Street, Edmonton, AB, Canada T6H 5T6, and Dep. of Agricultural, Food and Nutritional Science, Univ. of Alberta, Edmonton, AB, Canada T6G 2P5
^b Crop Diversification Centre North, Alberta Agriculture, Food and Rural Development, RR6, 17507 Fort Road, Edmonton, AB, Canada T5B 4K3
^c Biometrics and Statistics Unit, International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Mexico D.F., México
^d Crop Diversification Centre South, S.S. #4, Alberta Agriculture, Food and Rural Development, Brooks, AB, Canada T1R 1E6

View larger version (27K): [in a new window]   Fig. 1. Geographic regions and test sites for field pea variety trials in Alberta during 1997 to 2001. The numbers in italics are average yields of sites in Mg ha–1.

View larger version (32K): [in a new window]   Fig. 2. Dendrogram for clustering 34 sites used for testing field pea varieties in 1997 through 2001. The numbers in parenthesis after site names identify different geographic regions (cf. Fig. 1): 1d, South Alberta (dryland); 1i, South Alberta (irrigated); 2, East Central Alberta; 3, West Central Alberta; and 4, Peace River Region. The dashed line is the cutoff point for identifying isoyield groups. The regression lines of sites within an isoyield group do not differ significantly at the 0.05 probability level.