Use and efficiency of soil herbicides in controling common ragweed (Ambrosia artemisiifolia L.) in spruce seedlings (Picea abies L. Karst) production
2012
Milijeviš, Ilija (PFE Šume Republike Srpske – Center for seed and nursery production, Doboj (Bosnia and Herzegovina)) | Isajev, Vasilije (Faculty of Forestry, Belgrade (Serbia)) | Mataruga, Milan (Faculty of Forestry, Banja Luka (Bosnia and Herzegovina)) | Janjić, Vaskrsija (Institute of Pesticides and the Environment, Belgrade (Serbia)) | Delić, Slobodan (PD Erosion, Valjevo (Serbia))
: Common Ragweed (Ambrosia artemisiifolia L.) is a weed very difficult to suppress due to its aggressiveness, strength and adaptability and in that respect it is one of the most dangerous weeds. The research was conducted during 2007 and 2008 on the sample plot set in a nursery (where two year- old spruce seedlings were transplanted) in the nursery "Stanovi" Doboj. The following herbicides were used: (1) Lasso-atrazine (a.s. alachlor+atrazine) with a dose of 3.5 +1.5 l/ha and concentration of 0.83% (2) Goal (a.s. Oxyfluorfen) with a dose of 3 l/ha and concentration of 0.5% and (3) Racer 25-EC (a.s. Flurohloridon) with a dose of 2.5 l/ha and concentration of 0.31%. The number of plants is determined by counting the total plants 75 days (in 2007) and 60 days (in 2008) after the completion of the treatment. Based on the obtained data, the efficiency coefficient (CE) was calculated for certain herbicides, which represents the relative ratio between the destroyed Ambrosia plants in relation to their number on the control plot. The number of Ambrosia plants on the control plots in the first and second year of production was 108, i.e. 72 per square meter. In experimental fields, where Lasso-atrazine treatment was performed, the efficiency ratio in the first year was 76%, while in the second year it was 86%. In the plots where Goal was applied, the efficiency ratio was 77%, while in the second year it was 89%. In the plots where Racer was applied, the efficiency coefficient was 94%, and in the second year it was 96%. According to the presented results we can conclude that the treatment against Ambrosia plants with Racer was the most efficient one, both in the first and in the second year of study in the nursery, while Lasso-atrazine treatment had the least effect in both years.
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