Compost, vermicompost and biochar amendments are thought to improve soil quality and plant yield. However,
little is known about their long-term impact on crop yield and the environment in tropical agro-ecosystems. In
this study we investigated the effect of organic amendments (buffalo manure, compost and vermicompost)
and biochar (applied alone or with vermicompost) on plant yield, soil fertility, soil erosion and water dynamics
in a degraded Acrisol in Vietnam. Maize growth and yield, as well as weed growth, were examined for three years
in terrestrial mesocosms under natural rainfall.