Abstract: In this study，‘Jinxiang White Garlic’was cultivated with nutrient solution to investigate the effects of potassium in nutrient solution on physiological and quality of garlic. Five different K+ concentrations at 0，3.0，6.0，9.0 and 12.0 mmol · L-1 were designed. The results indicated that pigment content，net photosynthesis rate，fresh and dry weight of garlic sprout and bulb increased with K+ concentration ranging from 0–9.0 mmol · L-1，while decreased in the treatment of 12.0 mmol · L-1 K+ Compared with 0 mmol · L-1 K+ ，the treatment of 9.0 mmol · L-1 K+ enhanced the contents of soluble sugars，vitamin C，soluble proteins and allicin by 67.0%，31.22%，79.38% and 76.38%，respectively，in garlic sprout，while these indexes increased by 91.51%，45.61%，91.47% and 99.26%，respectively，in bulb.

Key words: garlic, potassium, nutrient solution, photosynthetic rate, bulb, nutrient quality