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Abdurahman, M D and Seeling, B and Rego, T J and Reddy, B B (1999) Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India. Crop Research (Hisar), 17 (3). pp. 273-281. ISSN 0970-4884
Abdurahman, M D and Seeling, B and Rego, T J and Reddy, B B (1999) The root system and N uptake of a safflower crop (Carthamus tinctorius L.). Crop Research (Hisar) , 17 (1). pp. 22-27. ISSN 0970-4884
Enyong, L A and Debrah, S K and Bationo, A (1999) Farmers’ perceptions and attitudes towards introduced soil-fertility enhancing technologies in western Africa. Nutrient Cycling in Agroecosystems, 53 (2). pp. 177-187. ISSN 1385-1314
Katayama, K and Ito, O and Adu-Gyamfi, J J and Rao, T P and Dacanay, E V and Yoneyama, T (1999) Effects of NPK fertilizer combinations on yield and nitrogen balance in sorghum or pigeonpea on a vertisol in the Semi-Arid Tropics. Soil Science and Plant Nutrition, 45 (1). pp. 143-150. ISSN 0038-0768
Narteh, L T and Sahrawat, K L (1999) Influence of flooding on electrochemical and chemical properties of West African soils. Geoderma, 87 (3-4). pp. 179-207. ISSN 0016-7061
Narteh, L T and Sahrawat, K L (1999) Oxalate and EDTA extractable soil phosphorus and iron in relation to P availability in lowland rice soils of West Africa. Ghana Journal of Agricultural Science, 32 (2). pp. 189-198. ISSN 0855-0042
Phiri, R H and Snapp, S and Kanyama-Phiri, G Y (1999) Soil nitrate dynamics in relation to nitrogen source and landscape position in Malawi. Agroforestry Systems, 47 (1-3). pp. 253-262. ISSN 0167-4366
Powell, J M and Ikpe, F N and Somda, Z C (1999) Crop yield and the fate of nitrogen and phosphorus following application of plant material and feces to soil. Nutrient Cycling in Agroecosystems, 54 (3). pp. 215-226. ISSN 1385-1314
Sahrawat, K L (1999) Phosphate sorption in benchmark Vertisol and Alfisol profiles. Journal of the Indian Sociely of Soil Science, 47 (1). pp. 144-146. ISSN 0019-638X
Lee, K K and Reddy, M V and Balaguravaiah, D and Rao, J V D K K and Wani, S P and Rao, K P C and Trimurtulu, N (1999) Effect of soil management on soil micro-organisms. In: Management of tropical agroecosystems and the beneficial soil biota. Science Publishers, USA, pp. 153-164. ISBN 1-57808-045-2
Wani, S P and Pathak, P and Singh, P and Algarswamy, G (1999) Nutrient and Water Management Strategies for Sustainable Crop Production in the SAT. In: Modern Approaches and Innovations in Soil Management. Rastogi Publications, Meerut, 09-31. ISBN 978-8171332908
van Duivenbooden, N and Pala, M and Studer, C and Bielders, C L, eds. (1999) Efficient soil water use: the key to sustainable crop production in the dry areas of West Asia, and North and Sub-Shararan Africa: proceedings of the Workshop, Niamey, Niger, 26-30 April 1998 and proceedings of the Workhop, Amman, Jordon, 9-13 May 1999. International Center for Agricultural Research in the Dry Areas, Aleppo, Syria. ISBN 9290664003
Pande, S and Johansen, C and Lauren, J and Bantilan, F T, eds. (1999) GIS analysis of cropping systems: proceedings of an International Workshop on Harmonization of Databases for GIS Analysis of Cropping Systems in the Asia Region,18-19 Aug 1997, ICRISAT-Patancheru, India. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India. ISBN 9290664037