It is anything but a high scientifical experiment, did you read PlantBiologists post? Did you read Ray Bensons post?
What you are doing.....what you are calling an experiment!! is far from an experiment....As it has been said there are many things wrong with that setup, to name a few;
horizontal pine block with man made holes, that block is not a living organism, you drilled the holes!!!! thus glazing the side walls, there is no natural decay, no microorganisms, etc..etc.. your results honestly will prove nothing & you will probably end up with a heavier block of wood!!
It would be like me taking a plastic bowl(a suggestion mentioned) putting a lid on it after filling it with water, drilling a hole in the lid with a keyhole saw & waiting to see what happens, my guess the plastic bowl cracks because of an expansion deformity thus popping the lid off..............or worse!!
My wife kicks the sh## out of me for ruining one of her tupperware bowls!!!
seriously neither scenario would prove anything, this is something I wish would be a topicin one of the industry Mag`s: inclusion cavities/failures regarding ice freeze/thaw.
LXT....................