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Adamou, A and Bationo, A and Tabo, R and Koala, S (2007) Improving soil fertility through the use of organic and inorganic plant nutrient and crop rotation in Niger. In: Advances in Integrated Soil Fertility Management in sub-Saharan Africa: Challenges and Opportunities. Springer, Netherlands, pp. 589-598. ISBN 978-1-4020-5759-5