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AbstractThree studies were performed in two different geographical areas in Graham County in 1998. A Bt hybrid comparison and a non-Bt hybrid comparison were grown in the Bonita area and a mixed (Bt and non-Bt) study was grown in the Eden area. Results of these three field studies are reported in this paper. Pioneer 33A14 was the leading cultivar in the Bonita Bt study with a yield of 13426 pounds per acre. Pioneer 32J55 had the highest yield in the non-Bt study in Bonita with a yield of 14630 pounds per acre. Novartis N7639 produced the highest yield in the Eden study but with a yield considerably lower than those seen in the Bonita area.