Evaluation of Herbicides for Control of Annual Weeds in Asparagus (Asparagus officinalis)
This research was conducted under field conditions in 1993 with a cooperative farmer with the aim of evaluating the effects of herbicides for the control of annual weeds (pre-emergence). The herbicides and rates (a.i./ha) applied were: Diuron 2.4 and 1.2 L, Linuron 1.5 and 0.7 L, Metribuzin 1.4 and 0.7 L, Simazina 1.5 L, Trifluralin 1 L and Naptalam+ Bensulide 4+3 L and 2+2 L. Two check plots were also included, one free of weeds and the other with weeds. A randomized block design was used with four replicates. The experimental units were 4.5 × 10-m plots. Trifluralin showed 56% of control and Naptalam+ Bensulide exhibited 24% at both rates, while Diuron (97% to 100%), Linuron (87% to 96%), Metribuzin (96% to 100%), and Simazina (96%) showed the best controls with either doses; of these, Linuron at 0.7 L/ha registered the lowest control (87%). None of the herbicides evaluated showed any plant toxicity.