Abstract
A field study was conducted in Gurabo, P.R., to examine the potential of drip-applied herbicides for weed control in polyethylene-mulched tomato. The herbicide treatments were a) metolachlor at a rate of 1.1 kg a.i./ha; b) napropamide at 2.2 kg a.i./ha; c) pebulate at 4.5 kg a.i./ha; and d) trifluralin at 0.8 kg a.i./ha. A nontreated control was added. Each herbicide plot was split in two application methods: preemergence application and through the drip lines with 100 m3 water. In both cases, herbicides were delivered three weeks before tomato transplanting. There was no significant difference between the two delivery methods. Metolachlor showed the best control of broadleaf weeds (>80%) and highest tomato fruit yield. Applying herbicides through the drip lines is a viable alternative in mulched tomato.
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