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Hayashi, K and Hayashi, E T and Fatondji, D (2013) Evaluation of the Indigenous Use of the Weed Sida cordifolia L. in the Sahelian Zone of West Africa. Japan Agricultural Research Quarterly, 47 (4). pp. 389-396. ISSN 0021-3551
Hayashi, K and Abdoulaye, T and Matsunaga, R and Tobita, S (2012) Appraisal of Local Farmers’ Practices on Land Management for a Guideline of Agricultural Development in the Sahel Zone of Niger. JARQ - Japan Agricultural Research Quarterly, 43 (1). pp. 63-69. ISSN 0021-3551
Hayashi, K and Matsumoto, N and Hayashi, E T and Abdoulaye, T and Shinjo, H and Tabo, R and Matsunaga, R and Tobita, S (2012) Estimation of nitrogen flow within a village-farm model in Fakara region in Niger, Sahelian zone of West Africa. Nutrient Cycling in Agroecosystems, 92 (3). pp. 289-304. ISSN 1385-1314
Nakamura, S and Hayashi, K and Omae, H and Fatondji, D and Tabo, R and Shinjo, H and Saidou, A K and Tobita, S (2012) Rothamsted carbon model reveals technical options to maintain soil organic carbon under semi-arid climate. Agronomy for Sustainable Development, 32 (4). pp. 865-872. ISSN 1774-0746
Nakamura, S and Hayashi, K and Omae, H and Ramadjita, T and Fatondji, D and Shinjo, H and Saidou, A K and Tobita, S (2011) Validation of soil organic carbon dynamics model in the semi-arid tropics in Niger, West Africa. Nutrient Cycling in Agroecosystems, 89. pp. 375-385.
Hayashi, K and Abdoulaye, T and Wakatsuki, T (2010) Evaluation of the utilization of heated sewage sludge for peri-urban horticulture production in the Sahel of West Africa. Agricultural Systems, 103 (1). pp. 36-40. ISSN 0308-521X
Hayashi, K and Abdoulaye, T and Gerard, B and Bationo, A (2008) Evaluation of application timing in fertilizer micro-dosing technology on millet production in Niger, West Africa. Nutrient Cycling in Agroecosystems, 80 (3). pp. 257-265. ISSN 1385-1314
Tobita, S and Shinjo, H and Hayashi, K and Matsunaga, R and et al, . (2011) Identification of plant genetic resources with high potential contribution to soil fertility enhancement in the Sahel, with special interest in fallow vegetation. In: Innovations as Key to the Green Revolution in Africa. Exploring the Scientific Facts . Springer, Netherlands, pp. 701-706. ISBN 978-90-481-2541-8