This publication provides comprehensive step by step guidance in the application of fallout radionuclides (FRNs) for investigating soil erosion and soil redistribution affecting agro-ecosystems, it is written for scientists and technicians from disciplines such as soil science, ecology, and agronomy, as well as undergraduate and graduate students, and staff of non-governmental organizations involved in agricultural development at local, national, regional and international level. The publication concludes with a paper which presents current and future trends and opportunities in the use of FRNs to document agricultural soil redistribution from field to landscape scales across the short, medium and long term. The publication is also available in CD-ROM format.