Statistical analysis
Di¡erences in treatment means were compared by
Duncan’s Multiple Range Test. The percentage data
were arcsine-square root transformed to ensure a normal
distribution (Zar 1984) and tested for statistical
signi¢cance (Po0.05) byone-wayanalysis of variance.
All statistical analysiswas carried out using Statistical
Package for Social Science (SPSS 2002, version11.5).