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Field experiments were carried out in 2008–2009 at the Research Station of the Department of Agronomy in Chylice. The objective of this study was weed control efficacy of two preparations DPX-CDQ 74 (metsulfuron methyl + tifensulfuron methyl) and Granstar 75 WG (tribenuron methyl) in winter wheat (cv. Ludwig and Smuga), triticale (cv. Magnat and Grenado), rye (cv. Warko and Dańkowskie Diament) and spring wheat (cv. Monsun and Żura), barley (cv. Nagradowicki and Justina). The herbicides were applied in the spring at tillering of cereals (BBCH 24–29) while weeds were controlled at the stage in BBCH 14–16/22–23. Herbicides were applied at the doses: DPX-CDQ 74 60 g/ha and 75 g/ha and Granstar 75 WG – 20 g/ha with adiuvant Trend 90 EC in dose 0.05%. Weed infestation in cereals depended on plant species and cultivars. In cereals the dominant weed species were: Papaver rhoeas, Viola arvensis, Veronica agrestis, Galium aparine, Lamium amplexicaule, Matricaria inodora, Stellaria media, Capsella bursa-pastoris (winter) and Chenopodium album, Amaranthus retroflexus and Polygonum spp. (spring). The results of presented research revealed a high level of efficacy (86–100%) of new herbicide DPX-CDQ 74 against dicotyledonous weeds.
Field experiments were carried out in 200–2009 at the Research Station of Department of Agronomy in Chylice. The objective of the study was the effectiveness of growth regulator BAS 12 208 W, used alone and with ammonium sulphate and retardant Cycocel 750 SL. Growth regulators were applied at 2 node of winter barley (BBCH 32) and at 3–4 node of spring barley (BBCH 33–34) in different doses. The best retardant effect was observed for BAS 12 208 W + Cycocel 750 SL in spring barley and for BAS 12 208 W + ammonium sulphate at the highest dose in winter barley. In field experiments barley logging was not recorded, and the yield value was comparable in all experimental objects.
Field experiments were carried out in 2007–2009 in a long-term rye monoculture, at the faculty Research Station SGGW in Skierniewice. They were performed in 5 objects: Ca, CaNPK, NPK, Ca + FYM every year, CaNPK + FYM every 4 years. In the autumn in rye monoculture herbicide Expert Met 56 WG was applied at the dose 0.35 kg/ha. The highest efficacy of this herbicide was observed in treatments CaNPK, CaNPK + FYM every 4 years, and NPK. The mean level of weed control (> 70%) was obtained in Ca and Ca + FYM treatments every year. The investigated herbicide in all fertilized objects was very effective against: Lithospermum arvense, Anthemis arvensis and Matricaria inodora. Viola arvensis and Galium aparine were characterized by a low susceptibility to metribuzin + flufenacet.
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