Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 1
Written by Atanas SEVOV, Nesho NESHEV, Mariyan YANEV, Anyo MITKOV
In a study, conducted during the period 2023-24, it was found that weed control in alfalfa is difficult to achieve with a single herbicide application. The efficacy varies depending on the species composition of the weeds. The highest efficacy against Eastern groundsel, Prickly lettuce and Shepherd's purse was reported when Corum - 125 ml/da is applied, against Field pennycress and Flixweed with Pulsar Plus - 160 ml/da, against Milk thistle with Cleranda SC - 200 ml/da. The highest phytotoxicity was registrated at variant treated with Onix - 100 ml/da - score 4, and it is not completely overcome and remains visible until the first swath. At all other other variants, the phytotoxicity is weaker and is overcome by the plants. The highest chlorophyll index was recorded with untreated control, and the lowest with Onyx treatment – 100 ml/da at the first reporting, with the values of the indicator increasing at subsequent reading dates. Foliar herbicides treatments does not unidirectionally affect the plants height, as well as the yield of green and dry mass.
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