Plamen Marinov-Serafimov, Irena Golubinova
Agricultural Academy, Institute of Forage Crops, Pleven 5800, Bulgaria
Marinov-Serafimov, P. & Golubinova, I. (2019). The influence of some herbicides on seed production in standard wheatgrass (Agropyron desertorum (Fisch.) Schultes). Bulgarian Journal of Agricultural Science, 25 (6), 1191–1197
A study was conducted in the experimental field of the Institute of Forage Crops – Pleven during the 2015-2017 on a slightly leached chernozem soil under non-irrigating conditions to determine the selectivity of some herbicides to standard wheatgrass (Agropyron desertorum (Fisch.) Schultes) seed production year (second year of stand growing). It was established that Аccurate 60 WG (600 g/kg metsulfuron methyl) – 10 g/ha, Аlly Max (143 g/kg metsulfuron + 143 g/kg tribenuron methyl) – 30 g/ha, Arat (250 g/kg tritosulfuron + 500 g/kg dicamba) – 150 g/ha, Biathlon 4D (54 g/kg florasulam + 714 g/kg tritosulfuron) + Adjuvant Dash– 40 + 1000 ml/ha, Buctril Universal (280 g/l bromoxynil + 280 g/l 2,4-D) – 800 ml/ha and Granstar Super 50 SG (250 g/kg tribenuron methyl + 250 g/kg thifensulfuron methyl) – 40 g/ha applied to the growth stage BBCH 22-23 for the control of broadleaf weeds in the seed production year are highly selective to standard wheatgrass variety Morava and do not affect the yield and quality of the seeds. At the mixed weed infestance (monocotyledonous and dicotyledonous weeds) during the seed production year (second year of stand growing) of standard wheatgrass, two-component selective herbicides can be used – Merlin flex (240 g/l isoxaflutole + 240 g/l cyprotsulfamide) 420 ml/ha and Pacifica WG (30 g/kg mesosulfuron, 10 g/kg iodosulfuron-methyl sodium, 90 g/kg mefenpyr-diethyl) + Adjuvant Biopower – 350 + 700 ml/ha. Herbicides Axial one (45 g/l pinoxadene + 5 g/l florasulam) – 1000 ml/ha cause a phytotoxic effect, reduce seed yield and degrade quality of standard wheatgrass seed. The herbicide tolerance of standard wheatgrass to key herbicides with complex action (for weed control against annual monocotyledonous and dicotyledonous weeds) has been determined, which could serve as a means of increasing the efficiency of the breeding process.