Strategier til ukrudtsbekæmpelse i sukkerroer
Konklusion
I tre forsøg undersøges strategier til bekæmpelse af ukrudt. Der har i år generelt været en meget god effekt af alle ukrudtsstrategier med Betanal, og de største forskelle blev observeret når man udelader Betanal i en strategi. Sæsonen 2024 var kendetegnet ved et meget vådt forår – og deraf følgende sen såning i stort set alle forsøg. Den sene såning efterfulgtes af varme og fugtige forhold, hvilket generelt set var gunstigt for en hurtig fremspiring af både roer og ukrudt. Vejrbetingelserne i sprøjteperioden var præget af både vind og regn, hvilket udfordrede rettidigheden. Vejret anses dog ikke at have påvirket resultaterne fra forsøgsserien negativt. Der er udført forskellige strategier med og uden clomazon (Centium) – de fytotoksiske skader fra clomazonbehandlingerne har igen i år været tydelige – og det har resulteret i begrænsede udbyttetab i de parceller der har fået clomazon efter fremspiring. På effektdelen synes Centium efter fremspiring at kunne forøge effekten overfor ukrudtet – specielt vejpileurt har været vanskelig at bekæmpe i et af forsøgene – og her har Centium givet et væsentligt løft af effekten. I ledene 11-15 er fire biostimulanter afprøvet mht. om de kan hjælpe planterne imod fytotoksiske skader fra herbicidbehandlingerne. Vi har for overskuelighedens skyld i år valgt at skille konklusionerne omkring biostimulanterne ud i en særskilt rapport som du også kan finde her i beretningen (tallene for disse led indgår dog i tabeller m.m. i denne rapport).
Conclusion
In three trials, weed control strategies are being investigated. This year, all weed control strategies with Betanal have generally had a very good effect, and the largest differences were observed when Betanal is excluded from a strategy. The 2024 season was characterized by a very wet spring – and consequently late sowing in almost all trials. The late sowing was followed by warm and humid conditions, which were generally favorable for rapid germination of both beets and weeds. The weather conditions during the spraying period were characterized by both wind and rain, which challenged timeliness. However, the weather is not considered to have negatively affected the results from the series of trials. Different strategies have been carried out with and without clomazone (Centium) – the phytotoxic damage from the Centium treatments has again been evident this year – and this has resulted in limited yield losses in the plots that have received Centium after germination. In terms of efficacy, Centium seems to be able to increase the effect against weeds after germination – especially common knotgrass (POLAV) has been difficult to control in one of the trials – and here Centium has given a significant boost to the effect. In sections 11-15, four biostimulants were tested to see if they can help the plants against phytotoxic damage from herbicide treatments. For the sake of clarity, this year we have chosen to separate the conclusions about the biostimulants into a separate report, which you can also find here (the figures for these entries are included in tables etc. in this report).