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Ito, O and Johansen, C and Adu-Gyamfi, J J and Katayama, K and Kumar Rao, J V D K and Rego, T J, eds. (1996) Roots and nitrogen in cropping systems of the semi-arid tropics. Proceedings of the International Workshop: Dynamics of Roots and Nitrogen in Cropping Systems of the Semi-Arid Tropics, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, India, 21-25 November 1994. JIRCAS International Agriculture Series (3). Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki, Japan.. ISBN 4-906635-01-6