Base on the farming experiment of the state-owned grasslands in Songnen Plain,2008~2010.In this paper,the three different rows spacing of alfalfa seed production has been studied,the results showed that: Public 1,the appropriate spacing of the Alfalfa planting is 30cm-45cm,in western Jilin.We also conducted the Rhizobium inoculation.After investigation,in the vaccination area,the average plant height of alfalfa and hay production increased by 14.6% and 32.4%,the Crop yields increased significantly,this is a...