Micronutrients in Tropical Food Crop Production

Management of Nitrogen and Phosphorus Fertilizers in Sub-Saharan Africa: Proceedings of a symposium, held in Lome, Togo, March 25–28, 1985

Managing Organic Matter in Tropical Soils: Scope and Limitations: Proceedings of a Workshop organized by the Center for Development Research at the University of Bonn (ZEF Bonn) — Germany, 7–10 June, 1999