ABSTRACT

The performance of Bollgard and non-bollgard varieties based on lint yield/ha was examined in variety trials conducted from 1998-2002 in Chihuahua, Méx. A total of 126 comparisons between Bollgard or Bollgard Roundup Ready varieties and their recurrent parents were made using the variety trial data. The data set was acquired from FCAyF trials, county extension trials and consultant trials. All trials were grown using conventional management for insect and weed control. Comparisons were made across and within years for Delicias-Meoqui, Jiménez, and Ascención-Nuevo Casas Grandes regions. A dollar return per ha for the Bollgard varieties over and above the non-Bollgard varieties was figured using the base loan rate of $0.5165. Bollgard varieties produced a 91-lb yield increase over the non-Bollgard varieties when averaged across all years and location. Yield differences within years for the entire region varied from a low of 18-lb/ha in 1999 to high of 196-lbs/ha in 2000. The dollar returns per ha for the Bollgard varieties over and above the non-Bollgard varieties varied from a low of $9.30/ha in 1999 to high of $101.24/ha in 2000 with an average dollar return per ha of $47.10.