Split-split-Plot analysis: means comparison

Hi everyone, currently I am working with a Split-split-Plot experiment (2x3x2 Factorial) and
I used ssp.plot() function on agricolae package to analyze my data set, but I have some interaction between factors (Factor B: Factor C), and I can't do a comparison of means.

Someone know a script to make LSD or Tukey tests?
I am grateful, thank you!