So, if that is what you call hay, what do you call....

[Ottinmeg]

pad of hay, pad of straw

 

[Chex]

It would be a leaf again. But don't often say it because I either use round bales, or just chuck the whole bale in.

 

[Pennyhp]

I have always used the term section for both.

Here in Canada I have only heard it called flakes.

 

[asbo]

section of hay , bale of straw