Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 1
Written by Nicolaie IONESCU, Diana Maria POPESCU, Mariana Cristina NICOLAE, Cristina GHIORGHE, Maria Magdalena PODEA, Ilie Cătălin DINUȚĂ, Robert Marian GHEORGHE
Having a more developed leaf system, one might think that the sunflower can fight much better with weed species during the growing season. Young plants, however, are the most vulnerable, as in the case of other cultivated plants. Weed biomass currently exceeds 10-12 t/ha, and their spectrum is diverse. On average, production losses due to weeding exceed 1.0-1.5 t/ha of seeds. As a structure, MA constituted on average 8.6 t/ha, DA 2.6 t/ha, and DP 1.0 t/ha. Weeding as often as needed has proven somewhat more effective than in the case of other cultivated plants. Herbicide with specific products contributed year after year to obtaining obvious increases in production. In the case of the application of single herbicides, the increases were below 1.0 t/ha, and in the case of the combined and associated ones, the increase in production was around 1.5 t/ha. Today, reducing herbicide doses still requires adequate research.
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