营养液浓度对水培生菜生长和硝酸盐积累的影响

Effects of different nutrient solution concentrations on the growth and nitrate accumulation of hydroponic lettuce

该文研究了4种营养液浓度处理(山崎生菜配方的1/4(1/4s)、1/2(1/2s)、1(1s)和2(2s)单位)对水培生菜(品种为“弘农”和“绿领”)生长、硝酸盐积累和品质的影响。结果表明,1/2单位营养液浓度处理下生菜地上部和根的鲜重、叶长和叶宽最大,而2个单位营养液浓度处理下上述指标最小。不同营养液浓度处理下叶片硝酸盐积累的高低顺序为2s>1s>1/2s>1/4s,2个单位营养液浓度处理下生菜生长发育后期叶片中的SOD活性和M DA含量最高。对采收时生菜品质的分析表明,生菜体内的硝酸盐含量随着营养液浓度的增加而迅速上升,2个单位营养液浓度处理下生菜叶片中硝酸盐、可溶性糖和可溶性蛋白质R含量最高。综合考虑产量和品质,采用1/2单位的山崎生菜配方是适合生菜水培的营养液配方。

Effects of four different nutrient solution concentration treatments(1/4,1/2,1 and 2 units of Yamasaki lettuce nutrient solution formula) on the growth and nitrate accumulation of lettuce(cv.Hongnong and Lvling) were investigated.The results showed that shoot and root fresh weights,leaf length and width were the biggest in the 1/2 unit nutrient solution treatment,whereas they were the least in the treatment of 2 unit nutrient(solution).The accumulation of nitrate in the lettuce leaves in different nutrient solution treatments was 2s>1s>1/2s>1/4s,and the SOD activity and MDA content in lettuce leaves were the highest in the treatment of 2 unit nutrient solution.The nitrate content in the leaves increased significantly with the concentration of nutrient(solution),and the highest nitrate content,soluble protein content and soluble sugar content were in the treatment of 2 unit nutrient solution.It was suggested that 1/2 unit of Yamasaki lettuce nutrient solution formula was the most economic nutrient solution formula suited for lettuce hydroponic production.