A. G. de Jager

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• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the(More)
About NUTNET NUTNET is a network that aims to improve the management of soil fertility in Africa. It is a partnership of fifteen organisations from six African and two European countries: About Enhancing soil fertility in Africa: from field to policy-maker (NAGREF) from Greece. It is funded by the International Cooperation for Development (INCO) programme(More)
Nutrients are transported all over the world through fertilizer imports, exports of agricultural commodities, massive erosion in some places and gross volatilization and leaching in high-input/high-output agricultural systems. In other words, more or less balanced natural ecosystems have turned into highly unbalanced agricultural systems. Figure 20.1 shows(More)
Re-use of nutrients within farming systems contributes to sustainable food production in nutrient limited production systems. Re-use is established when nutrients pass through several farm compartments before they leave the farm via marketable products. In this paper re-use of nitrogen is examined as an indicator for sustainable soil fertility management.(More)
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