Suggested SAS Code for the belowground plots (split-strip plot analysis)

PROC ANOVA;

CLASSES BLK B M N P;

MODEL RESP= BLK B BLK*B M B*M BLK*B*M

N P N*P B*N B*P B*N*P BLK*B*N*P

M*N M*P M*N*P BLK*M*N*P

B*M*N B*M*P B*M*N*P;

TEST H=B E=BLK*B;

TEST H=M B*M E=BLK*B*M;

TEST H=N P N*P B*N B*P B*N*P E=BLK*B*N*P;

TEST H=M*N M*P M*N*P E=BLK*M*N*P;

MEANS B|M|N|P;

*Note: this analysis is not appropriate for missing data, nor does it give correct mean separations for intereaction means in split-plot design. For those analysis, PROC MIXED is the desired tool.

Source: Tim Todd (Plant Pathology, KSU); November 1997