关键词: 大蒜, 钙, 光合特性, 品质

Abstract: In this experiment，the effects of calcium in nutrient solution on calcium content，photosynthetic characteristics and qualities of garlic were studied. Six different Ca²⁺ concentrations at 0，1.0，2.0，3.0，4.0，5.0 mmol · L^-1 were designed. The results indicated that the calcium contents of garlic bolt and bulb were increased with the increase of calcium concentrations. When the calcium concentrations were in the range of 0–3.0 mmol · L^-1，the pigment contents and photosynthetic parameters（P_n，E，G_s）of garlic leaves were enhanced with the increase of calcium concentrations，then they were decreased with the increase of calcium concentrations. The fresh weight of bolt and bulb，the bolt diameter，the bolting rate and the transverse diameter of bulb were increased at first and then decreased with the increase of calcium concentrations，these shape indexes under 3.0 mmol · L^-1 treatment were the highest. At the same time，the contents of allicin，soluble sugar，vitamin C，free amino acid and soluble protein in bolt and bulb were also improved with the increase of calcium concentrations ranging from 0 to 3.0 mmol · L^-1，these  indexes under 3.0 mmol · L^-1 treatment were increased by 54.7% and 72.1%，33.9% and 33.9%，11.5% and 5.2%，19.3% and 21.5%，32.6% and 29.6% compared to the treatment of 1.0 mmol · L^-1 calcium concentration，then they were minished with the increase of calcium concentrations greater than 3.0 mmol · L^-1. Thus it can be seen that，the 3.0 mmol · L^-1 calcium concentration was the best treatment to garlic under hydroponic condition.

Key words: garlic, calcium, photosynthetic characteristic, quality