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Summary The field experiment was carried out in the years 2008–2012 at the Research and Education Unit in Swadzim, at present a part of the Poznan University of Life Sciences. The aim of the study was to analyze influence of ploughing and ploughing with simultaneous ploughing-in a full dose of manure, conducted only once after many years of reduced tillage and direct sowing, on secondary weed infestation of maize cultivated in many-year monoculture. It was demonstrated that interruption of many-year no-tillage cultivation system and direct sowing with one-time deep autumn ploughing with ploughing in a full dose of manure resulted in a significant increase in the number of weeds in the year of the measure. The number and fresh matter of weeds were affected by effectiveness of used herbicides and thermal and humidity conditions during vegetation seasons. Barnyard grass and couch grass were the most troublesome and long-lasting weed secondary infestation species in the maize monoculture.

progress in plant protection

Secondary weed infestation of maize cultivated in monoculture after single ploughing and manure fertilization after many-year no-tillage cultivation and direct seeding