The Selectivity, Efficacy and Influence of Five Herbicide Treatments on the Yield and Crop Height in Maize

The use of herbicide treatments is an important method for reducing the competition between crop and weeds. The main objective of this paper is to investigate the degree of selectivity and the effectiveness of five new herbicides applied early post-emergently (stage of development of crop 2-4 leaves; stage of development of weeds 1-3 leaves) in the control of the annual and perennial monocotyledonous and dicotyledonous weed species from the maize crop. The study was performed on cambic chernozem in the experimental) fields of the National Agricultural Research and Development Institute Fundulea in the years 2017 and 2018. The herbicide treatments were: Adengo [isoxaflutol 225 g/l + tiencarbazon-metil 90 g/l + ciprosulfamide (safener) 150 g/l] + Lontrel 300 (300 g/l clopyralid); Adengo [isoxaflutol 225 g/l + tiencarbazon-metil 90 g/l + ciprosulfamide (safener) 150 g/l], Merlin Duo (isoxaflutol 37,5 g/l + terbutilazin 375 g/l), Akris (dimetenamid-P 280 g/l + terbutilazin 250 g/l) and Arigo (nicosulfuron 12% + rimsulfuron 3% + mezotrione 36%) + Adj. (Trend). In this study, best control of annual and perennial weeds was achieved in the experimental variants: Adengo + Lontrel; Arigo + Adj. The herbicides application must be correlated with: the infestation degree of weeds, the spectrum and dominance of weeds, the time of application, the type of soil, the local climatic conditions.