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Canopy Nitrogen Reserves: Impact on Soybean Yield and Seed Quality Traits in Northern Latitudes

Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Cir., St. Paul, MN 55108. Research supported in part by the Minnesota Agricultural Experiment Station

View larger version (30K): [in this window] [in a new window]   Fig. 1. Rainfall and average ambient temperature profiles for 10 environments in Minnesota. Solid or broken-line curves represent mean temperature profiles for environments within each year [2003 (STP03, BECK03, and MORR03); 2004 (RSMT04, STP04, BECK04, MORR04); 2005 (RSMT05, STP05, and MORR05)]. Bars represent rainfall distribution shown as totals for early-, mid-, and late-season precipitation by environment. These seasonal totals represent 15 May through 30 June (Days 135–181), 1 July through 14 Aug (Days 182–226), and 15 August through 30 September (Days 227–273). Two environments, BECK03 and BECK04, are not shown due to bi-weekly irrigation from 1 June through 15 September.

View larger version (22K): [in this window] [in a new window]   Fig. 2. Relationship between R5.5 canopy N and seed yield in 10 environments in Minnesota. Linear regressions are provided for visualizing separation of individual environments; dotted lines do not imply relationships between canopy N and seed yield. For RSMT04 and MORR04, solid regression lines indicate a significant correlation between traits (P < 0.05). Regression equations and coefficients of determination are noted.

View larger version (11K): [in this window] [in a new window]   Fig. 3. Trait x environment biplot describing the G + G x E (genotype + genotype x environment interaction) of 10 environments and nine traits for six cultivars. This plot is based on nontransformed, scaled (by dividing values by the standard deviation of their corresponding environment), environment-centered, and environment-focused single value partitioned data. The biplot explained 75.3% of the total G + G x E.