title: SPATIAL STRUCTURE OF WEED CONTENSION OF GRAIN-GRASS-ROW CROP ROTATION IN THE NORTH-WEST OF RUSSIA
abstract: The study was carried out to analyze the spatial distribution of weeds in grain-grass-row crop rotation in the North-West region of the Russian Federation. Based on calculations of the index of pairwise species similarity and the coefficient of commonality of specific abundance, it was revealed, on the one hand, a high similarity in the species composition of weeds within the studied crop rotation (0.81...0.94), on the other hand, significant differences in the structure of weediness in fields (
journal: Vestnik of Kazan state agrarin university