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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
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
Sivakumar, M V K and Salaam, S A (1999) Effect of year and fertilizer on water-use efficiency of pearl millet (Pennisetum glaucum) in Niger. Journal of Agricultural Science, 132 (2). pp. 139-148. ISSN 0021-8596