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C:N ratio in after-harvest residues (including straw) decides on speed and intensity of decomposition. In one-year field small-plot experiment, there were included these variants: (1) monoculture of winter wheat fertilized with 140 kg N/ha; (2) monoculture of winter pea not fertilized with nitrogen; (3) mixed culture of both these crops in 1:1 ratio fertilized with 112 kg N/ha; (4) mixed culture of the crops in 1:1 ratio fertilized with 70 kg N/ha; (5) mixed culture of both crops in 1:1 ratio not fertilized with n...