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Challenges in Comparing Transgenic and Nontransgenic Soybean Cultivars

The Univ. of Georgia, Griffin Campus, 1109 Experiment St., Griffin, GA 30223

View larger version (20K): [in a new window]   Fig. 1. Adoption of Roundup Ready soybean in the USA, 1996 to 2001. Source: National Agricultural Statistics Service, 2001.

View larger version (29K): [in a new window]   Fig. 2. Frequency distribution of 269 individual comparisons of the seed yield of Roundup Ready (RR) soybean cultivars relative to the test mean. Data are from soybean variety test programs conducted by nine southern states in 1995 and 1996. Each unit on the x-axis represents a difference of 67.19 kg ha-1 (one bushel per acre).

View larger version (18K): [in a new window]   Fig. 3. Schematic representation of the cultivar selection process before and after large scale adoption of Roundup Ready (RR) soybean.