Like mineral fertilizers, the use of organic residues requires knowledge of its fertilizer properties to be able to provide farmers with sound advice. Hence the TERO project is based on a network of test sites located in various soil-climate conditions on the island. The tests focus on gaining insight into the nitrogen fertilizer value of Mafor when applied in sugarcane crop fields, as nitrogen is a major yield-enhancing nutrient. This research on different types of organic residues, which will be carried out over 14 years at four sites, focuses on:

• knowledge of their apparent nitrogen recovery efficiency (ANR) and nitrogen fertilizer equivalence coefficients
• their direct fertilizer effects and side-effects on sugarcane.