4/9 This is true but not only part of the story. What they found out together with their farmers network is, that sweet potato (Boniato) works very well in the first year, and there's no yield loss with this crop (This is the Boniato part of CarBoniato). Afterwards, a low-N-demanding crop, such as faba-bean is being grown. After roughly a year, the woodchips have been digested by the soil life to a large degree and C/N is significantly lower already while the N in the wood (in 150 tons, there's about 1000 kg of N!) is being converted to stable forms that are accessible in the soil, contributing to the long term #fertility of the soils.