Chemical control of weeds in transplanted rice (Oryza sativa L. cv, INTI) with granulated herbicides.
In a field trial at Guadalupe with transplanted rice, the granulated herbicides (a) oxyfluorfen A and (b) oxyfluorfen B, (c) penoxalin [pendimethalin], (d) benthiocarb [thiobencarb], (e) benthio-simetryne, (f) dimethametryn-piperophos and oxadiazon at different rates were evaluated. The most aggressive weeds were Echinochloa crus-galli, E. colonum and Ischaemum rugosum. The most efficient herbicides for grasses were (a), (b) and (c) with mean percentage control of 87.1, 81.2 and 73.2, resp. and for broad leaved weeds, (a), (e) and (f). Without weed control, grain yield was 1.14 t, and the highest grain yields were obtained with (a), (b) and (c) at 6.88, 5.53 and 5.53 t, resp. compared with 8.43 t/ha with hand weeding.