Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 2
Written by Miroslav TITYANOV, Tonyo TONEV, Zarya RANKOVA, Cveta MOSKOVA, Anyo MITKOV, Mariyan YANEV, Nesho NESHEV, Evgenia VELINOVA
Maize is the third most important crop in Bulgaria. Weed infestation is one of the key factors responsible for the lower productivity and poor quality of the maize production. Reduction in grain yield ranges from 33 to 50% or even more depending on the intensity and nature of the weed flora. During 2018 and 2019 cropping seasons field trials were conducted in the region of Plovdiv, Bulgaria. The trials were situated on the base for training and implementation of the Agricultural University - Plovdiv. The experiments were carried out in non-irrigated conditions. The aim of the resent research is to establish the suitability of applying some new herbicide products and to investigate their efficacy in different application timings: pre-emergence (BBCH 00) and early post-emergence (BBCH-13). Several herbicides and mixtures were tested: mezotrione 50 g/l + terbutilazine 326 g/l SC - 180 ml/da; mezotrione 50 g/l + terbutilazine 326 g/l SC - 230 ml/da; mezotrione 75 g/l + terbutilazine 375 g/l + clomazone 40 g/l - 150 ml/da; mezotrione 75 g/l + terbutilazine 375 g/l + clomazone 40 g/l - 200 ml/da; S-metolаchlor 312.5 g/l + terbutilazine 187.5 g/l - 350 ml/da. The obtained data was compared with untreated control. The experimental field was naturally infested with Sorghum halepense (L.) Pers., Setaria viridis L., Chenopodium album L., Xanthium strumarium L., Amaranthus blitoides L., Datura stramonium L., Solanum nigrum L. and Portulaca oleracea L. After evaluating the efficacy of the herbicides we concluded that during the testing period when the soil was very dry the efficacy of the herbicides applied during the early post emergence (BBCH-13) showed higher efficacy against the weeds existing on the field.
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