After 14 days of Al treatment, the shoots and roots of the
soybean plants were separated for data collection. After roots were
thoroughly washed with demineralized water, the root length was
measured using the software WinRHIZO image analysis (STD
1600þ). The scanner was set to 21 29 cm for standardization of
the scanner area. The total length and total volume of the root were
measured, and the root dry weight (DW) was recorded after the
roots had been dried for 24 h at 60 C.