RESPONSE OF BAR-TRANSFORMED RICE (ORYZA-SATIVA) AND RED RICE (ORYZA-SATIVA) TO GLUFOSINATE APPLICATION TIMING

Glufosinate at 2.2 kg ai/ha injured rice transformed with the BAR gene more when applied to one- to two-leaf (23 to 26%) than to three- to f our-leaf (13 to 19%) plants. Visible injury was least when application s were made at boot stage (3 to 14%). However, applications at boot st age caused an average grain yield reduction of 16%. Most treatments di d not influence rice plant height. Among single applications (0.3, 0.4 , 0.6, 0.8, and 1.1 kg/ha), 1.1 kg/ha glufosinate at three- to four-le af stage of red rice resulted in greater control (91%) than at panicle initiation (74%) or at boot stage (77%). Injury to red rice was two t o 11 times greater than the injury to BAR-transformed rice depending o n glufosinate rate and application timing.