split plot repeated measures.

[Naweena]

I have a year long data on with 4 seasons as whole plot and 6 treatments. each season has 3 rows as replication per season and in each row 6 treatments are applied (10 trees per treatment). data were taken just before treatments and each month after treatment for 3 months. now I have to compare among the treatments winth each season as well as among seasons too. how do proceed with such data?

P.S. I am new to SAS so this will help me learn SAS too.