沼液对莴笋和生菜硝酸盐含量及营养品质的影响

Effect of application of biogas slurry on nitrate content and nutrition quality of lettuce and romaine lettuce

采用盆栽试验 ,研究了不同沼液用量对莴笋、生菜硝酸盐含量和营养品质的影响。结果表明 ,施用沼液提高了莴笋、生菜株高和产量 ,降低了莴笋茎和生菜硝酸盐含量 ,有利于增加莴笋茎、叶及生菜含水量和氨基酸含量 ,生菜维生素C含量略高于对照。在施用氮磷钾化肥 (N 12 0mg·kg-1、P2 O580mg·kg-1、K2 O 10 0mg·kg-1)基础上 ,每钵增施沼液 5 0 0ml,可改善蔬菜营养品质 ,使莴笋叶和生菜硝酸盐含量分别降低 5 3.5 %和 4 5 .5 % ,同时还可使 2种蔬菜分别增产 5 1.0 %和 5 6 .7% ,为本试验条件下莴笋、生菜最佳施肥组合。

A pot experiment was conducted to study effect of application of biogas slurry on nitrate content and nutrition quality in romaine lettuce and lettuce. The results show that the application of biogas slurry increased plant height and yield of the crops, which had lower nitrate contents but higher water and amino acid contents (in lettuce) and higher vitamin C content (in romaine lettuce). On the basis of N,P,K fertilization (N∶P∶K=120∶80∶100 mg·kg -1 ), additional application of biogas slurry at 500 ml·pot -1 improved nutrition quality of the vegetables by decreasing nitrate content in the leaves of lettuce and romaine lettuce by 53.5% and 45.5% respectively, and also increased yield by 51.0% and 56.7% , respectively.Under this experiment conditions, the fertilization recommendation is the best for the two crops.