Starting my lasagna beds

[ScottinAtlanta]

Folks, I learned about lasagna beds right on this Forum, and so thank you. I am building 5 raised beds lasagna style, 12 inches high by 25 feet by 3 feet wide.

The method is as follows:

I start with a 4 inch layer of mulched leaves and tree bark that have composted for a year (already black). I wet it thoroughly.
Layer 2 is 3 inches of soil - brown top soil mixed with 30% sand.
Layer 3 is freshly mulched leaves, about 4 inches again.
Layer 4 is soil to the top of the boards - making 12 inches high.

My question - is there anything else I should be adding at this point to get it ready for March planting?

I wanted also to note that composting is amazing. I piled up mulched leaves a week ago, and today the centre of the pile was close to 100 degrees, even after a pouring rain. Those little buggers were really working hard.