Contents include: Variation in Time of Seedling Emergence within Populations, LR Benjamin. Forage Tree Legumes: Their Management and Contribution to the Nitrogen Economy of Wet and Humid Tropical Environments, G Blair, D Catchpoole & P Horne. Evaluation & Documentation of Genetic Resources in Cereals, A Damiana. Modelling Crop Growth & Function, B Klepper & R Rickman. Nitrogen Fixation by Legumes in Tropical and Subtropical Agriculture, M Peoples & D Herridge.