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The level of weed infestation directly affects the intensity of competitive relationship between sunflower crops and weeds. The greatest damage is caused by annual, broad-leaf and invasive weeds, such as  Ambrosia artemisiifolia  L.,  Xanthium strumarium  L. and  Datura stramonium  L. Suppression of these weeds is difficult because of deficiency of adequate herbicides and because in years with dry springs, such as in 2009, the use of herbicides gives no results. This two-year study dealt with the observed effects of pre-emergence flurochloridone + s-metolachlor herbicides on the distribution of weeds in different stages of sunflower development. Weed infestation was estimated over the sunflower developmental stages,  i.e. , in the periods when weeds were removed and when the total fresh and dry biomass of the weed species was determined. Simultaneously, in order to monitor the effects of weeds in dependence on herbicides application and the duration of competition, the sunflower plant height was measured. At the end of the life cycle, the yield and the oil content of the sunflower seeds were established.

helia

EFFECTS OF APPLIED HERBICIDES ON CROP PRODUCTIVITY AND ON WEED INFESTATION IN DIFFERENT GROWTH STAGES OF SUNFLOWER (Helianthus annuus L.) / LOS EFECTOS DE LOS HERBICIDAS APLICADOS CONTRA LA INFESTACIÓN POR LAS MALAS HIERBAS DE GIRASOL (Helianthus annuus L.) EN DIFERENTES ESTADIOS DE DESENROLLO Y PRODUCTIVIDAD / EFFETS DE L'APPLICATION D'HERBICIDES SUR L'ENHERBEMENT A DIFFERENTS STADES DE DEVELOPPEMENT DU TOURNESOL (Helianthus annuus L.) ET SUR SA PRODUCTIVITE