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Crop Mineral Nutrient and Yield Responses to Aphids or Barley Yellow Dwarf Virus in Spring Wheat and Oat

^a USDA-ARS, North Central Agric. Res. Lab., 2923 Medary Ave., Brookings, SD
^b USDA-ARS, North Central Soil Conservation Res. Lab., 803 Iowa Ave., Morris, MN

View larger version (28K): [in this window] [in a new window]   Figure 1. Treatment effects on leaf concentrations of chlorophyll, N, Ca, and Mg across years (1997 and 1998) and crops (wheat and oat). Error bars represent standard error of the mean. (BCOA, bird cherry-oat aphids; BYDV, barley yellow dwarf virus; Cont., control; GB, greenbug; RWA, Russian wheat aphids.)

View larger version (21K): [in this window] [in a new window]   Figure 2. Plot of the crop x treatment interaction averaged over 2 yr for the seed m–1 dependent variable. Error bars represent standard error of the mean. (BCOA, bird cherry-oat aphids; BYDV, barley yellow dwarf virus; Cont., control; GB, greenbug; RWA, Russian wheat aphids.)

View larger version (21K): [in this window] [in a new window]   Figure 3. Plot of the crop x treatment interaction averaged over 2 yr for the thousand kernel weight dependent variable. Error bars represent standard error of the mean. (BCOA, bird cherry-oat aphids; BYDV, barley yellow dwarf virus; Cont., control; GB, greenbug; RWA, Russian wheat aphids.)

View larger version (20K): [in this window] [in a new window]   Figure 4. Grain yield deviation (kg ha–1) from the control due to crop x treatment interaction averaged over 2 yr. Error bars represent standard error of the mean. (BCOA, bird cherry-oat aphids; BYDV, barley yellow dwarf virus; GB, greenbug; RWA, Russian wheat aphids.)

View larger version (20K): [in this window] [in a new window]   Figure 5. Grain yield deviation (kg ha–1) from the control due to year x treatment interaction averaged over two crops. Error bars represent standard error of the mean. (BCOA, bird cherry-oat aphids; BYDV, barley yellow dwarf virus; GB, greenbug; RWA, Russian wheat aphids.)

View larger version (21K): [in this window] [in a new window]   Figure 6. Scatter plot of 10 crop–treatment combinations over three replications and 2 yr (1997 and 1998) as a function of the first canonical root derived from agronomic traits (x axis) and chemical nutrients (y axis). The dotted lines mark the origin of each of the canonical roots. The solid vertical line delineates the boundary between the two growing seasons (1997 and 1998). (O, oat; W, wheat; BCOA, bird cherry-oat aphids; BYDV, barley yellow dwarf virus; GB, greenbug; RWA, Russian wheat aphids; LAI, leaf area index; dT, midday differential canopy temperature deviation from control; LA, leaf area; GY, grain yield.)