Time is running short and I have to get some seeds in the SBs. My trials to date have been; In the following photo the SB on the left is 50/50 CS/compost. The one on the right is 100% compost.
After drying for a couple of days, I split the blocks like you would a ripe Georgia peach. This photo shows the 50/50 block split in half with little fragmentation. I think much too dense for seed starting.
The 100% compost block, split but did not just fall apart. I think it would be acceptable for starting seeds.
In this photo the block on the left is the two blocks from the first photos crumbled and a third block made from that material. It would be about 25% casing. The block on the wright, has more compost added bringing the casting down to about 15%.
This block is about 25% casing.
And this block is about 15% casings.
At this point, I think that since the top several ins of my RBs are compost, the percentage of casings are irrelevant. The seedlings will be growing through 100% compost before reaching any worm casings. On my next go around, I am going to use 100% compost, you probably knew this is where I was headed. As usual all comments are welcome. John