The large scale conversion of extensive swidden agriculture to intensive market oriented production of maize in upland areas of South East Asia is a cause of environmental concern. This study investigates how intensive maize cultivation affects soil quality in an upland area of Northern Thailand by comparing commonly used indicators of soil quality in soils from maize fields used at various intensities. Relations between these indicators and concentration of permanganate oxidizable carbon (Pox‐C) – a low cost proxy for soil quality – are also examined. The extent, type and drivers of land use changes between 2002 and 2012 are investigated by classification of high resolution satellite images, interviews, participatory mapping and questionnaires. We document a widespread change from traditional swidden agriculture to intensive cultivation of maize that is mainly brought about by economcic and political drivers. We show that the concentration of Pox‐C in the top soil of the maize fields is closely related to common indicators of soil quality and to farmers' perceptions of soil quality. Most of the other soil quality indicators are negatively – albeit not significantly – related to intensity of maize cultivation. There is a strong negative correlation between intensity of maize cultivation and concentration of Pox‐C in the upper 5 cm of the soil where the Pox‐C concentration declines with a rate of 40 mg year under maize⁻¹. We conclude that Pox‐C is a sensitive indicator of effects of land use intensity on the soil and a useful integrative measure of soil quality. Copyright © 2016 John Wiley & Sons, Ltd.

The rapid expansion of modern food retail encapsulated in the so-called ‘supermarket revolution’ is often portrayed as a pivotal driving force in the modernization of agri-food systems in the Global South. Based on fieldwork conducted on horticulture value chains in West Java and South Sulawesi, this paper explores this phenomenon and the concerted efforts that government and corporate actors undertake with regard to agri-food value chain interventions and market modernization in Indonesia. The paper argues that after more than 15 years of ‘supermarket revolution’ in Indonesia, traditional food retail appears not to be in complete demise, but rather adaptive and resilient to its modern competitors. The analysis of local manifestations of supermarket-led agricultural development suggests that traditional markets can offer certain advantages for farmers over supermarket-driven value chains. The paper further identifies and discusses two areas that have so far been neglected by research and policymaking and which warrant further investigation: (i) the simultaneous transformations in traditional food value chains and their relation to modern markets, and (ii) the social and environmental performances of modern vis-à-vis traditional food value chains.

This paper addresses the main dynamics in the global agro-industrial value chains for tropical products. It examines new upgrading opportunities for smallholder production in Africa as a consequence of two dominant trends within global agricultural value chains. The first is caused by the dynamics of the co-existing collaboration and intensified rivalry between lead firms within the same chain. The other is caused by new opportunities and challenges stemming from increased requirements on retailer-driven markets in the North and expansion of new markets in the South. The paper points out the need to rectify the heavily biased policy focus on standard compliance with the purpose of strengthening smallholder incorporation and upgrading in retailer-driven strands of global value chains ending in the North. Instead, markets in the South and in emerging economies may function as a training ground for upgrading of African smallholder production via increases in volume and consistency of exports.