Investigation of the selectivity and effectiveness of different herbicides on the production of white lupin (Lupinus albus L.)

Sofiya Petrova, Svetlin Ivanov, Blagoy Andonov, Desislava Angelova

Abstract: The white lupine in the initial stages of its development has a weak competitive ability with the weed flora, which makes weed control effective and even necessary, but there are not many registered herbicides. The aim of the present study is to investigate the effectiveness and selectivity of the herbicides used in the practice against the weed flora spread on white lupine, as well as to evaluate their effect on grain yield. The experiment was conducted on the experimental field of IRGR - Sadovo in 2022-2023 in two repetitions and experimental plot of 10 m2 per each variant and sub-variant. The experiment was set up with eight variants: six herbicides with one treatment dose, one herbicide in two doses and one untreated, control variant. In order to investigate the effect of the biostimulant Kaishi, seven subvariants were included in which the biostimulant was added to each herbicide. High selectivity towards white lupine and high efficiency towards weed flora was found in the herbicides Cycloxidim and Fuazifop-P-butyl, applied in doses of 200 ml/da and 130 ml/da, respectively. The multi-component herbicide Florasulam+ Clokintout – Messehill+ Piroxulam at a dose of 26.5 ml/da and the single-component ArylexTM – at a dose of 5 ml/da, applied together with Kaishi (200 ml/da), showed better selectivity than applied alone. The established significant interaction between herbicide x weed by the two-way analysis of variance proved that the tested herbicides acted effectively on weeds (especially Polygonum convolvulus and Convolvulus arvensis) and had a positive effect on the yield of forage white lupin compared to the control. The obtained results proved the achievement of good weed control in forage white lupin by tested herbicides that are currently not registered for use in lupin production in Bulgaria, such as Cycloxidim, Fluazifop-P-butyl and Imazamox.

Keywords: grain yield; herbicide; Lupinus albus L.; phytotoxicity; selectivity

Citation: Petrova, S., Ivanov, S., Andonov, B. & Angelova, D. (2025). Investigation of the selectivity and effectiveness of different herbicides on the production of white lupin (Lupinus albus L.). Bulg. J. Agric. Sci., 31(3), 517–521.

Date published: 2025-06-24