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Seed Yield, Oil, and Fatty Acids of Cuphea in the Northwestern Corn Belt

USDA-ARS, North Central Soil Conservation Research Lab., 803 Iowa Avenue, Morris, MN 56267, and USDA-ARS, National Center for Agricultural Utilization Research, Peoria, IL 61604

View larger version (21K): [in a new window]   Fig. 1. Seed yields of dryland cuphea averaged across sowing dates for seven locations in Iowa and Minnesota during 2002 and 2003. Within years, differing letters indicate differences in seed yields (p < 0.05). Data for Roseau in 2002 are missing (M) because of regional flooding that destroyed all plots. Locations are arranged from south (Lewis) to north (Roseau).

View larger version (21K): [in a new window]   Fig. 2. Effect of irrigation on seed yield of cuphea at three sites during 2003. Differing letters atop columns indicate differences in seed yields (p < 0.05).

View larger version (21K): [in a new window]   Fig. 3. Harvest index is the ratio of seed yield to aboveground dry weight, and was calculated from regression equations (slopes) to be 0.05 for cuphea grown in Iowa (IA), and 0.14 for cuphea grown in Minnesota (MN). Extremely low dry weights (<3000 kg ha–1) and yields in Iowa were due to drought conditions. Closed symbols represent dryland plants (dry), and open symbols indicate irrigated plants (wet).

View larger version (32K): [in a new window]   Fig. 4. Effect of planting date on seed yield of irrigated and dryland cuphea during 2003. Within each watering regime, letters atop columns that are not in common indicate differences in seed yields (p < 0.05).