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In the years 2015–2017 the field experiments were carried out in the region of Eastern Poland. The aim of the experiment was to determine the impact of potato crop management methods using growth bioregulators and herbicide on air-dry weed mass, that was determined prior row closure of potatoes and before harvesting tubers. The experiment was established on light soil, in a split-plot design in three replications. The following factors were investigated: I. three early potato varieties – Bellarosa, Owacja, Vineta, II. methods of applications of growth biostimulators: GreenOK Universal – PRO and Asahi SL and their combination with the herbicide Avatar 293 ZC. The aerial dry weight of weeds, both at the beginning of potato vegetation, as well as before the harvest of tubers, significantly differentiated varietal properties, methods of care and weather conditions prevailing in the years of research. The smallest value of the air-dry matter of weeds in both dates of the determinations was found in the Bellarosa cultivar on the following sites: 5. for mechanically treated emergence, and after the final shape of ridge just before the emergence of potato plants sprayed with herbicide Avatar 293 ZC at a dose of 1.5 dm3/ha. The significant influence of weather factors on the value of the discussed feature was also proved.

The weed infestation of the potato (Solanum tuberosum L.) field under the conditions of growth biostymulators and herbicide applications