Abstract: New Allium fistulosum L. var. giganteam Makino varieties （‘H1316’ and ‘Neicong2’） were taken as materials,which breeding by Inner Mongolia academy of agricultural and animal husbandry sciences,and 3 different planting densities（80 cm×5 cm,80 cm×6 cm and 80 cm×7 cm ） were set to study their effects on agronomic traits and yield of Allium fistulosum L. var. giganteam Makino.The results showed that there was no significant difference in the bolting rate,plant height,pseudo stem length,and pseudostem diameter of the onion varieties with increasing planting density.The plant height,pseudo stem length and pseudostem diameters of ‘Neicong 2’ were better than ‘H1316’,which were 129.43 cm,55.80 cm and 3.53 cm,respectively.The density of B3 （80 cm×7 cm） was the best,and plant weight of ‘Neicong 2’ was better than H1316,which was 526.27 g.With the increase of density,the yield of ‘H1316’ and ‘Neicong 2’ was the highest,108 238.35 kg/hm² and 125 412.60 kg/hm²,respectively.Therefore,‘Neicong 2’ is recommended as the preferential variety in Inner Mongolia Allium fistulosum L. var. giganteam Makino production with the planting density of 80 cm×5 cm.

Key words: Allium fistulosum L. var. giganteam Makino, Planting density, Agronomic traits, Yield