The article discusses how different types of fallows (clear, borrowed, and green manure) affect the productivity of winter rye, soil fertility, and economic efficiency in crop rotations. The researchers found that clover and vetch-oat fallows were the best predecessors for winter rye in different periods. Grain crop saturation reduced winter rye productivity, but green manure vetch-oat fallow increased it. Introducing low doses of fertilizers improved winter rye productivity without significant differences in predecessors. Borrowed and green manure fallows increased crop rotation efficiency and soil fertility. The humus balance was negative with high grain crop saturation but became positive with green mass ploughing. The humus content in winter rye fields increased over 8 years of rotation. Crop rotations with green manure fallows were the most profitable. To improve crop rotation efficiency and soil fertility, it is recommended to use crop rotations with borrowed and green manure fallows with legumes and crucifers crops.