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Abekoe, M K and Sahrawat, K L (2003) Long-Term Cropping Effect on Phosphorus Fractions in an Ultisol of the Humid Forest Zone in West Africa. Communications in Soil Science and Plant Analysis, 34 (3 & 4). pp. 427-437. ISSN 0010-3624
Sahrawat, K L and Jones, M P and Diatta, S and Sika, M (2003) Long-Term Phosphorus Fertilizer Effects on Phosphorus Uptake, Efficiency, and Recovery by Upland Rice on an Ultisol. Communications in Soil Science and Plant Analysis, 34 (7-8). pp. 999-1011. ISSN 0010-3624
Wani, S P and Pathak, P and Jangawad, L S and Eswaran, H and Singh, P (2003) Improved management of Vertisols in the semiarid tropics for increased productivity and soil carbon sequestration. Soil Use and Management, 19 (3). pp. 217-222. ISSN 1475-2743
Wani, S P and Rego, T J (2003) Macro benefits from Micronutrients. Documentation. International Crops Research Institute for the Semi-Arid Tropics , Patancheru, Andhra Pradesh, India.