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Ishikawa, S and Adu-Gyamfi, J J and Nakamura, T and Yoshihara, T and Watanabe, T and Wagatsuma, T (2002) Genotypic variability in phosphorus solubilizing activity of root exudates by pigeonpea grown in low-nutrient environments. Plant and Soil, 245 (1). pp. 71-81.
Nakamura, T and Adu-Gyamfi, J J and Yamamoto, A and Ishikawa, S and Nakano, H and Ito, O (2002) Varietal differences in root growth as related to nitrogen uptake by sorghum plants in low-nitrogen environment. Plant and Soil, 245 (1). pp. 17-24.
Subbarao, G V and Sahrawat, K L (2006) Scope and strategies for regulation of nitrification in agricultural systems - challenges and opportunities. Critical Reviews in Plant Sciences, 25 (4). pp. 303-335. ISSN 0735-2689