The samples in the form of a film cut into rectangles (110 mm �� 100 mm) were weighted before being placed in the wire-type cages to protect them from mechanical damage and animal invasions, and thereafter buried in the field soil dug about 10 cm below

The samples in the form of a film cut into rectangles (110 mm �� 100 mm) were weighted before being placed in the wire-type cages to protect them from mechanical damage and animal invasions, and thereafter buried in the field soil dug about 10 cm below the soil surface.