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Nitrogen Fertility Effects on Bt -Endotoxin and Nitrogen Concentrations of Maize during Early Growth

^a USDA-ARS, Crop Genet. and Prod. Res. Unit, Box 345, Stoneville, MS 38776
^b USDA-ARS, Southern Insect Manage. Res. Unit, Box 346, Stoneville, MS 38776

View larger version (12K): [in a new window]   Fig. 1. Whole-plant N concentration averaged over two Bacillus thuringiensis (Bt) maize hybrids (Pioneer 33V08 and Dekalb 626Bt) at growth stage V5 grown with varying rates of N fertility. *Significant at the 0.05 level.

View larger version (10K): [in a new window]   Fig. 2. Endotoxin concentrations averaged two Bacillus thuringiensis (Bt) maize hybrids (Pioneer 33V08 and Dekalb 626Bt) at growth stage V5 grown with varying rates of N fertility. *Significant at the 0.05 level.

View larger version (9K): [in a new window]   Fig. 3. Relationship of whole-plant N concentration and endotoxin concentration of two Bt maize hybrids (Pioneer 33V08 and Dekalb 626Bt) at growth stage V5 grown under N fertility rates of 0, 112, 224, and 336 kg ha-1. **Significant at the 0.01 level.