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Lee, K K and Wani, S P and Yoneyama, T and Trimurtulu, N and Harikrishnan, R (1994) Associative N2-fixation in pearl millet and sorghum: levels and response to inoculation. Soil Science and Plant Nutrition, 40 (3). pp. 477-484. ISSN 0038-0768
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.
Adu-Gyamfi, J J and Ito, O and Yoneyama, T and Katayama, K (1997) Nitrogen management and biological nitrogen fixation in sorghum / pigeonpea intercropping on Alfisols of the semi-arid tropics. Soil Science and Plant Nutrition, 43. pp. 1061-1066.