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Adu-Gyamfi, J J (1999) Food Security in Nutrient-Stressed Environments: Exploiting Plants' Genetic Capabilities, Summary and Recommendations of an International Workshop 27-30 Sep 1999. Manual. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India.
Adu-Gyamfi, J J and Ito, O and Yoneyama, T and Devi, G and Katayama, K (1997) Timing of N fertilization on N2 fixation, N recovery and soil profile nitrate dynamics on sorghum/pigeonpea intercrops on Alfisols on the semi-arid tropics. Nutrient Cycling in Agroecosystems, 48 (3). pp. 197-208.
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.
Yamamoto, A and Nakamura, T and Adu-Gyamfi, J J and Saigusa, M (2002) Relationship between chlorophyll content in leaves of sorghum and pigeonpea determined by extraction method and by chlorophyll meter (SPAD-502). Journal of Plant Nutrition, 25 (10). pp. 2295-2301.