573808.fig.003
Figure 3: Grass height under different biosolids rates, methods of application (BioInc: soil-incorporated method; BioSur:  surface-applied method), and dates (year 2006, 2007, or 2008) at a seeded abandoned field in Chihuahua, Mexico. ( ) or quadratic effect ( ), ; , , , ; , , , . , , , ; , , , ; , , , .