Great stuff! I'm trying to move along similar lines, too: when I took over my land it was covered in 6 feet tall grass which I cut and stacked in piles along the edges of each field. I then cut it up as fine as possible with my brushcutter (if you pile up the grass so the fibres all lay in the same direction, it's relatively easy) and move it onto the newly formed beds which I then cover with black tarps to help it decompose. What's left over I either spread around as mulch or have been trying to get to compost on site by adding nitrogen. Either way, I'm convinced that I don't need outside nutrients: if I can just get the exchange right, all I should have to do is move nutrients around, letting them balance out where needed and speeding up their natural decomposition.