Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Anyo MITKOV
In 2019 and 2020 two field experiments with two sunflower hybrids (Diamantis CL and Р64LP130 CLP) was conducted. The trial was stated on the experimental field of the Agricultural University of Plovdiv, Bulgaria. The efficacy and selectivity of the herbicide products Pulsar 40 (40 g/l imazamox), Pulsar Plus (25 g/l imazamox) and Viballa CE (3 g/l halauxifen-methyl), applied separately, in combinations as tank mixtures in 10 days interval and separately were evaluated. The dominating weeds on the field were Chenopodium album L., Amaranthus retroflexus L., Xanthium strumarium L., Abutilon theophrasti Medik., Datura stramonium L., Solanum nigrum L., Portulaca oleracea L., Setaria viridis L., Sinapis arvensis L., Sorghum halepense L. (Pers.), and Convolvulus arvensis L. The highest efficacy against Ch. album after the application of Viballa in both years of the study was recorded. For this product, the efficacy against D. stramonium, P. oleracea, and C. arvensis was the lowest. Both sunflower hybrids demonstrated the highest seed yield after the application of Pulsar 40 and Pulsar Plus separately followed by their tank mixture with Viballa in 10 days interval.
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