The goal of our research was to monitor the effect of the foliar bio-fertiliser Bionat Plus on potato yield and the increase of plant resistance to the attack by the Colorado beetle (Leptinotarsa decemlineata) as a result of stimulating plant vegetative growth and of the repellent effect of the preparation. This is just the beginning of such research in the field, through which we try to apply simultaneously warned phyto-sanitary treatments and foliar bio-fertiliser complexes. The trial was set on a potato crop – the Ostara cultivar from the Almaj Valley (Caras-Severin County) – in two variants and a control. In variant I we used the foliar bio- fertiliser Bionat Plus together with pesticides in doses of 2 l/ha in the first treatment and 3 l/ha in the second treatment. In variant II, we applied all 3 warned chemical treatments with no bio-fertiliser. The yield increase in the first variant was 3500 kg/ha compared to the second variant (treated with pesticides only), and the percentage of chemical treatment reduction was 33.3%. In the first treatment we no longer applied treatment 3, since by applying the two chemical treatments together with the foliar bio-fertiliser Bionat Plus, the attack by the Colorado beetle was below the economic damage threshold.

foliar bio-fertiliser; treatments; production; effect

Presentation: oral