The effects of some herbicides and depth of planting on seed germination.
Six herbicides were applied at various concns. to seeds of Imperata cylindrica, Pennisetum pedicellatum and Oryza sativa. In general, germination decreased as herbicide concn. increased. Paraquat was the most effective herbicide tested; at 1000 ppm. it completely inhibited germination of I. cylindrica and O. sativa. In a depth of sowing study, emergence of seedlings decreased with increasing depth of sowing. Seeds of I. cylindrica were the most affected with no emergence occurring at or below 4 cm. The percentage germination of P. pedicellatum was 45 and 19.2 at depths of 2 cm and 6 cm, respectively, while O. sativa germination decreased from 82.5% at 2 cm to 50.8% at 12 cm.