Attached are the trials i did with biochar from rice husks and vermicast. I mixed the two together and filled the containers to become my garden.
Some of the lessons i learned
1. vermicast is highly water soluble and quick releasing than compost. Therefore i had to sprinkle a scoop of the vermicast once every week.
2. The vermi cast - biochar mix need a curing time before it can support the plants. Beneficial microorganisms can help cure the mix.
3. The earthworms take up a considerable amount of nutrients from the compost to become their body tissues.
And then do you think we can use the biochar-vermicast mix into the floating gardens? They are much lighter.
Good luck with your project.