The Efficiency of Foramsulfuron, Sulfosulfuron, Metribuzin and Aclonifen Herbicides on Weed Control in Tomato (Lcopersicon esculentum L.)

To investigate the efficiency of herbicides on weed control in tomato, an experiment was conducted on randomize complete block design with three replications in Chenaran - Khorasan Razavi - in 2010. The treatments included of herbicide dosage Sulfosulfuron (20, 40, 60 and 80 g ha-1), Aclonifen (1, 2, 3 and 4 L ha-1), Foramsulfuron (1, 1.5, 2 and 2.5 L ha-1) and Metribuzin (100, 200, 300 and 600 g ha-1).The control plots were consisted as weed free and weedy check, respectively. In order to measure weed density, dry matter, weed control percentage and evaluating herbicide effect on tomato based on EWRC, sampling was taken before herbicide application and 20 days after herbicide treatments. At the end of growing season, traits such as tomato per plant dry matter, per plant yield and total tomato yield was measured. Metribuzin, Sulfosulfuron, Foramsulfuron and Aclonifen provided weak to satisfactory level of weed control, respectively. On the other hand, the lowest weed dry matter and weed density was found at high doses of herbicides that was associated with damage to tomato. Foramsulfuron, Sulfosulfuron and Metribuzin/ resulted the highest tomato dry matter. the highest tomato plant yield, gained by Metribuzin and Aclonifen herbicides, respectively. Totally, Aclonifen (2 and 3 L ha-1), Foramsulfuron (1.5 L ha-1), Metribuzin (300 g ha-1) and Sulfosulfuron (20 g ha-1) not only provided optimal weed control, but also high tomato yield with minimal damage to crop.