Experiment on Weed-control in Direct-planting Rice Fields with DE-638

The experiment on weed-control and safety to rice of 2.5%DE-638 OD in direct-planting Rice Fields was conducted during 2002 and 2003.The results showed that 2.5%DE-638 OD had good effect on weed-control. the suitable application period and the residual effect was longer. The herbicide could effedtively control barnyardgrass, at the same time it could effeetively control broad-leaf weeds such as Arrowleaf Monochoria, Bur Beggarticks etc. DE-638 was safe to rice plant. The suitable dosage is DE-638 15~37.5g.ai/hm2 and the suitable method is by spray.