Review Article

Involvement of Hormone- and ROS-Signaling Pathways in the Beneficial Action of Humic Substances on Plants Growing under Normal and Stressing Conditions

Figure 6

Root system growth and development in Brachiaria plants upon application of different concentrations of HA (unpublished data). HA were extracted from vermicompost of cattle manure. Images were recorded using the WinRHIZO software packet (Regent Instruments Inc., Quebec, Canada). Images are the representation of bioactivity experiments (nutrient solution) and reflect the first harvest (eight days after the transplant).