ABSTRACT
This research was carried out during 1998 to agronomicaly and phenologicaly evaluate four Bt cotton varieties and one conventional cotton variety in Delicias, Chih., México. Weeds and insect (except pinkworm and bud/bollworm) control, fertilizer management, and furrow irrigation were given as needed according to Delicias Region cotton production recommendations. In general, all varieties had similar behavior in plant height, main-stem nodes number, and fully-extended leaves number. DP-33B, DP-90B, and DP-32B obtained the highest yield because they accumulated high numbers of squares and bolls before boll weevil incidence. In contrast, DP-35B and DP-5690 concentrated most of their squares and bolls during boll weevil incidence.
|