Abstract: Weeds were, are and will be a big problem for crops, they affect and act in all conditions in all areas of the globe. The most significant sources of weed infestation of crops include weeds seeds deposited in soil and agricultural practices applied (Gruber and Clauplein, 2009). Tillage, or the absence of tillage, can affect weed population. The experimental factors were: factor A - the experimental years: A1-2014, A2-2015, A3- 2016; factor B - Tillage system: B1-Conventional tillage system included ploughing at 25 cm depth after harvest of the previous crop and processing with rotary harrow before sowing; B2-Minimum tillage system involved the use of a chisel at 25 cm depth after harvest of the previous crop and processing with rotary harrow before sowing; B3-No tillage system included the direct sowing. The experiment was conducted in the period 2014-2016 at the Agricultural Research-Development Station Turda. Immediately after sowing it was made one treatment with Gliphosate (4l/ha) in the three systems. Monocotyledonous and dicotyledonous weeds control was made after emergence of the crop with Tender (1.5 l/ha), Pulsar (1.0 l/ha) and Agil (1.0 l/ha) herbicide in a weeds rosette phenophase. After emergence of the crop in all three years, were recorded, by numerical method, 12 weed species, of which only 4 were found in all three years (Chenopodium album, Polygonum convolvulus, Setaria glauca, Xanthium strumarium). Before harvesting the crop in 2014-2016 period, were recorded 13 weed species, of which only 3 were found in all three years (Chenopodium album, Setaria glauca, Xanthium strumarium). Every year most species were found in the minimum tillage system, with 13 weeds/m2 compared to the conventional tillage system, the difference being very significant. The pea yield obtained in 2016 is higher and lower in 2015 with very significant differences compared to average years. In minimum tillage system weed seeds get in the top layer of soil, where to find germination conditions, resulting in a high degree of weeding.

Key words: peas, tillage system, weed, yield.

Presentation: poster