Study of the effects of mixed sowing of different alfalfa varieties in the Dongting Lake area

In order to investigate the effects of mixed sowing of different alfalfa varieties on their yield, quality, root system, and height, a mixed sowing experiment was conducted using WL712, WL903, WL656, and WL525, which was widely cultivated in the southern region. The results showed that although the amount of crude protein of the mixed sowing alfalfa did not exceed that of the unicast WL525, which was also used in mixed sowing, it was better than that of other unicast varieties also used in mixed sowing. Although plant height showed no significant increase, fiber content showed a decreasing trend with the increase of mowing times. The number of root neck branche and root neck diameter were better in mixed sowing than in unicast sowing. The total hay yields of WL656∶WL525=1∶4 and WL712∶WL525=1∶2 were the highest in all mixed sowing combinations, up to 14.67 t·ha-1, and the nutritive quality reached the premium alfalfa hay standard. Their annual growth was better than that of others, and it was possible to further trace the interspecific combination of research. In general, mixed sowing of alfalfa varieties with different proportions can improve forage quality and promote root growth.