The dataset inventories and compares experiments regarding on field application of biochar for agronomic purposes and its environmental effects (e.g. carbon sequestration) over a significative timeframe. Remediation of polluted soils is not in scope. The field experiments shall take place under dynamically, meteorologically and biologically complex conditions. We are mapping activities across Europe, North Africa and the Middle East (see the Highlights box here below). The LTEP project is an ICHAR initiative implemented and managed by the EMRG group of the University of Bologna.