Abstract
The investigation was conducted in the 2019–2020 agricultural season in the Al-Thaghr area, north of Basrah Governorate, Iraq (latitude 31.145288N and longitude 47.431334E), in clay soil. Two factors were used in the investigation. The first factor was the three tillage systems (heavy tillage by the mouldboard plow, low tillage by the chisel plow, and the no-till system). The second factor was three concentrations of the biocide Trichozon (4 g m-2, 2 g m-2, and without adding pesticide). The experiment was laid out in randomized complete block design (RCBD) with three replications. The results showed that the chisel plow recorded the lowest number and dry weight of weeds per square meter (16 plants m-2 and 0.24 g m-2 respectively). In contrast, the moldboard plow recorded the highest number and dry weight of weeds per square meter (79.6 plant m-2 and 14.17 g m-2, respectively).
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