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Yamoah, C F and Bationo, A and Shapiro, B and Koala, S (2011) Use of rainfall indices to analyze the effects of phosphate rocks on millet in the Sahel. African Journal of Agricultural Research, 6 (3). pp. 586-593. ISSN 1991-637X
Fatondji, D and Martius, C and Zougmore, R B and Vlek, P L G and Bielders, C L and Koala, S (2009) Decomposition of organic amendment and nutrient release under the zai technique in the Sahel. Nutrient Cycling in Agroecosystems, 85 (3). pp. 225-239.
Yamoah, C F and Bationo, A and Wyatt, T J and Shapiro, B and Koala, S (2003) Simulated weather variables effects on millet fertilized with phosphate rock in the Sahel. Nutrient Cycling in Agroecosystems, 67 (2). pp. 167-176. ISSN 1385-1314
Yamoah, C F and Bationo, A and Shapiro, B and Koala, S (2003) Soil management practices to improve nutrient-use efficiencies and reduce risk in millet-based cropping systems in the Sahel. Tropicultura, 21 (2). pp. 66-72. ISSN 0771-3312
Yamoah, C F and Bationo, A and Shapiro, B and Koala, S (2002) Trend and stability analyses of millet yields treated with fertilizer and crop residues in the Sahel. Field Crops Research, 75 (1). pp. 53-62.
Bationo, A and Lompo, F and Koala, S (1998) Research on nutrient flows and balances in west Africa: state-of-the-art. Agriculture, Ecosystems and Environment, 71 (1-3). pp. 19-35. ISSN 0167-8809
Shapiro, B I and Winslow, M and Traore, P C S and Balaji, V and Cooper, P and Rao, K P C and Wani, S P and Koala, S (2007) Climate applications and agriculture: CGIAR efforts, capacities and partner opportunities. In: Climate Prediction and Agriculture. Advances and Challenges . Springer Berlin Heidelberg, New York, pp. 63-70. ISBN 978-3-540-44649-1
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
Bationo, A and Nandwa, S M and Kimetu, J M and Kinyangi, J M and Bado, B V and Lompo, F and Kimani, S and Kihanda, F and Koala, S (2001) Sustainable intensification of crop– livestock systems through manure management in eastern and western Africa: Lessons learned and emerging research opportunities. In: Sustainable crop–livestock production for improved livelihoods and natural resource management in West Africa, Proceedings of an International onference, 19–22 November 2001, Ibadan, Nigeria.
Koala, S and Bielders, C L (1997) Extent and Severity of Wind Erosion in West and Central Africa. In: Wind Erosion in Africa and West Asia: Problems and Control Strategies, 22-25 April 1997, Cairo, Egypt.
Bielders, C L and Rajot, J L and Koala, S (1997) Wind Erosion Research in Niger: The Experience of ICRISAT and Advanced Research Organizations. In: Wind Erosion in Africa and West Asia: Problems and Control Strategies, 22-25 April 1997, Cairo, Egypt.