Figure 1

Phenotypic parameters of the lettuce plants grow under the different organic fertilizers, including control without fertilization (C) and control with chemical fertilization (CF) (n = 5). Different letters between treatments in the plots indicate statistical differences (p < 0.05). Pictures of the lettuce plants grown on the different organic fertilizers, including C and CF, and the following organic amendments. SS: sewage sludge; OFMSW: organic fraction of municipal solid waste; and SM: swine manure. Plot was created with Microsoft Excel (version16.6.6, https://www.microsoft.com/).