Usually you will want to look at simple effects of the factors when there is
interaction.  Please look at the WoodEnergy demos in the HH package.
These examples use glht.

install.packages("HH")  ## if you don't currently have HH
library(HH)
demo("MMC.WoodEnergy-aov")
demo("MMC.WoodEnergy")

Rich

	[[alternative HTML version deleted]]

