Cultivation method for high-yield oat forage grass sown in winter

The invention relates to the technical field of forage grass cultivation, in particular to a cultivation method for high-yield oat forage grass sown in winter. The method comprises the following steps: (1) selecting sowing time, that is, choosing an early sowing mode, and sowing within the last ten days of September to the middle ten days of October; (2) controlling a sowing density at 4 kg/mu; (2) controlling a fertilizer amount within 40 kg/mu. Due to early sowing, water-fertilizer heat in the natural environment can be well utilized, the nutrition time is sufficient, accumulation of dry substances is facilitated, and the yield can be increased. Within a certain sowing density range, sufficient natural resources and spaces are available for colonies to grow and develop, the sowing amountcan be increased, the number of individuals in the colonies can be increased, and the hay yield of the oat forage grass can be also increased. The amount of a nitrogenous fertilizer and the hay yieldare in a parabolic relati