Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Nesho NESHEV, Mariyan YANEV, Anyo MITKOV, Tonyo TONEV
In 2018 a field experiment with the sunflower hybrids SY Bacardi CLP and SY Diamantis CL was conducted. The experiment included the following treatments: 1. Untreated control; 2. Pulsar 40 - 1.25 l ha-1; 3. Pulsar 40 - 2.50 l ha-1; 4. Pulsar Plus - 1.20 l ha-1, 5. Pulsar Plus - 2.40 l ha-1. The herbicides were applied in phenophase 4th-6th true leaf of the crop. The efficacy and the selectivity of the studied herbicides were evaluated. The highest efficacy against S. halepense from rhizomes was recorded for treatment 5 (Pulsar Plus - 2.40 l ha-1). S. halepense developed from seeds, S. viridis, A. retroflexus, Xa. strumarium, S. nigrum and S. arvensis were successfully controlled by application of Pulsar 40 or Pulsar Plus in the low examined rates. Ch. album and A. theophrasti can be controlled by Pulsar Plus at the lower rate - 1.20 l ha-1. The absolute seed mass of 1000 seeds and the yield as well as the seed oil content from the plants treated with the registered and double herbicide rates, independently the herbicide product and studied hybrid, were higher than those of the untreated controls highly infested with weeds.
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