Keywords: 
• 缓释复合肥、莴笋、光合特性、品质性状

Abstract: A pot experiment was conducted to study the effect of chemical fertilizer and slow‐release com‐pound fertilizer at the appropriate and high levels on photosynthetic characteristics ;yield and quality of two varieties lettuce called Dabaijia and twin‐tip lettuce ,aiming to seek suitable management measures for the high yield and fine quality of lettuce production by using widely slow‐release compound fertilizers in Chongqing region .It studied the effect law of common chemical fertilizer and slow‐release compound fertil‐izer at appropriate (150-50-100) and high (225 -75-150) levels on yield ,photosynthetic characteris‐tics ,nitrate ,vitamin C ,sugar and amino of two varieties lettuce in the research .Results showed that the stomatal conductance (Gs) ,internal CO2 concentration (Ci) and transpiration rate (Tr) of two varieties lettuce in slow‐release compound fertilizer treatments (SRFO and SRFH ) increased by 43.3% -115% , 6.9% -24.4% and 54.6% -143% respectively compared to chemical fertilizers treatments (CFO and CFH) .The yield of two varieties lettuce increased in slow‐release compound fertilizer treatments by 8.1%-25.4% in stem and 8.1% -32.1% in leaf compared to chemical fertilizers treatments .Meanwhile ,ni‐trate content in slow‐release compound fertilizer treatments decreased by 11.7% -18.1% in stem and 5.0% -17.0% in leaf .In both varieties of lettuce ,the contents of Vc ,sucrose ,total sugar ,sweet and fla‐vor amino in slow‐release compound fertilizer treatments were higher than that in chemical fertilizers treat‐ments .Therefore ,compared to chemical fertilizers ,slow‐release compound fertilizer could enhance photo‐synthetic characteristics ,increase yield and improve quality of the two cultivars lettuce .