Abstract: The aim of this study was to determine optimal conditions for the production of silage from Medicago sativa and Bromus inermis. The two crops were sown at different proportions and both were mowed each year. Silage tests were carried out in the early flowering period and full?bloom period of first stubble, and in the full?bloom period of second stubble in the third year. The results for silage tests conducted at the flowering period of second stubble have been published previously. The nutritional indicators and fermentation indicators of silage made from mixed forages were determined. The forage quality and nutrient quality of silage were determined, and the optimal mixed sowing ratio was determined using grey system theory. We compared the silages produced in the above three periods, and found that the mixed sowing combination E1 (sowing rate: 9 kg?ha-1 M. sativa+30 kg?ha-1 B. inermis) performed best, especially silage produced in the full?bloom period of second stubble (fermentation indicators: pH 4.21, ammonia nitrogen/total nitrogen 3.94%, lactic acid 3.08%; nutritional indicators: crude protein 16.78%, crude fat 3.95%, neutral detergent fiber 61.02%, acidic detergent fiber 48.65%, soluble sugars 0.91%). The dry matter of the mixed forage combination was 6955.73 kg?ha-1. Considering the yield factors, under the production conditions of the E1 mixed forages, the highest yield of silage made in the early flowering period of first stubble+the full?bloom period of second stubble was 16337.13 kg?ha-1.

Key words: Medicago sativa, Bromus inermis, clipping stage, silage quality, mixed proportion