THE INFLUENCE OF PREEMERGENCE APPLIED HERBICIDES ON KENAF STAND, HEIGHT, AND YIELD

Herbicide trials were conducted in 1990 and 1992 to evaluate several h erbicides applied preemergence (PRE) for their effects on kenaf (Hibis cus cannabinus L.) stand, height, and yield. Herbicides evaluated were alachlor (3.36 kg al ha(-1)), atrazine (2.68 kg al ha(-1)), chlorimur on + metribuzin (0.67 kg al ha(-1)), clomazone (1.68 kg al ha(-1)), cy anazine (2.00 kg al ha(-1)), diuron (1.34 kg al ha(-1)), ethalfluralin (1.00 kg al ha(-1)), fluometuron (2.00 kg al ha(-1)), imazaquin (0.17 kg al ha(-1)), imazethapyr (0.09 kg al ha(-1)), metolachlor (3.00 kg al ha(-1)), metribuzin (0.50 kg al ha(-1)), norflurazon (1.70 kg al ha (-1)), or pendimethalin (1.34 kg al ha(-1)). Plant stand was reduced i n 1990 by alachlor, fluometuron, imazethapyr, or norflurazon. Stand wa s reduced both years by atrazine, chlorimuron + metribuzin, clomazone, cyanazine, diuron, imazaquin or metribuzin when compared to the untre ated control. Stand was not affected either year by ethalfluralin, met olachlor, or pendimethalin. All treatments caused significant kenaf in jury expressed as phytotoxicity with the exception of alachlor, ethalf luralin, imazethapyr, metolachlor, and pendimethalin. Kenaf height was not affected by alachlor, ethalfluralin, imazethapyr, metolachlor, no rflurazon, or pendimethalin. The only herbicides that did not result i n kenaf yield loss were alachlor, ethalfluralin, imazethapyr, metolach lor, or pendimethalin.