Information about the influence of growing winter wheat as a monoculture is limited. Therefore a study of winter wheat in five consecutive vegetation seasons (2015/2016, 2016/2017, 2017/2018, 2018/2019, and 2019/2020) was performed. The experiment was situated in the experimental field of „Agriculture and herbology” Department at the Agricultural University of Plovdiv, Bulgaria. The Bulgarian winter wheat variety “Enola” was under evaluation. All evaluated parameters of the crop such as the plant height before harvest, ear length, seed yield, absolute seed mass, as well as the hectoliter seed mass were influenced by the monoculture growing. The highest results of the studied indicators for winter wheat were recorded in the first two growing seasons. The studied parameters in the next growing periods were decreased by the monoculture, and the lowest results were recorded for the last experimental season.
Keywords: winter wheat, monoculture, development, seed yield