Long term Biochar Trials in Kenya

In this project, we report findings from the 15 years of meta-replicated trials, which are assessing the effect of biochar addition on maize and soybean rotations in smallholder farmers’ fields at three sites in two sub-humid regions of Kenya. Specific objectives were to analyse the effects of biochar input on: i) the yield of maize and soybean without and with inorganic fertiliser, ii) yield reliability, i.e. random variation among seasons, and iii) soil C and N stocks, extractable phosphorus (P) and potassium (K) content, acidity, water-holding capacity and bulk density.