Nutrient recycling and balance in cropping systems

Managing residues and nitrogen in intensive cropping systems. New understanding for efficient recovery by crops.
Author: Gilles Lemaire1, Sylvie Recousand Bruno Mary2

Progress in lifting soil fertility in Southern Africa
Author: Stephen R Waddington1the late Webster D Sakala2 and Mulugetta Mekuria1

Nutrients in Organic Farming – Are there advantages from the exclusive use of organic manures and untreated minerals? 
Author: Holger Kirchmann1 and Megan H. Ryan2