Fatondji, D and Martius, C and Vlek, P L G and Bielders, C L and Bationo, A (2011) Effect of Zai Soil and Water Conservation Technique on Water Balance and the Fate of Nitrate from Organic Amendments Applied: A Case of Degraded Crusted Soils in Niger. In: Innovations as Key to the Green Revolution in Africa. Springer, Netherlands, pp. 1125-1135. ISBN 978-90-481-2543-2