Flemish Inter-university Council (VLIR) and the Belgian Administration for Development
Cooperation (BADC). The first author is seconded to the Mekong Delta Farming Systems
R&D Institute by the Flemish Office for Development Cooperation and Technical
Assistance (VVOB). The authors wish to thank H.C. Linh, N.T.H. Chau, V.T.M. Huong,
V.T.T. Huong and N.V. Nhat for their assistance during the sampling.