In order to feed a growing global population projected to increase to 9 billion by 2050, food production will need to increase from its current level. The bulk of this growth will need to come from smallholder farmers who rely on generational knowledge in their farming practices and who live in locations where weather patterns and seasons are becoming less predictable due to climate change. The expansion of internet-connected devices is increasing opportunities to apply digital tools and services on smallholder farms, including monitoring soil and plants in horticulture, water quality in aquaculture, and ambient environments in greenhouses. In combination with other food security efforts, internet of things (IoT)-enabled precision smallholder farming has the potential to improve livelihoods and accelerate low- and middle-income countries’ journey to self-reliance. Using a combination of interviews, surveys and site visits to gather information, this research presents a review of the current state of the IoT for on-farm measurement, cases of successful IoT implementation in low- and middle-income countries, challenges associated with implementing the IoT on smallholder farms, and recommendations for practitioners.

Naturally-occurring membranes in the xylem tissue of gymnosperm sapwood enable its use as an abundantly-available material to construct filters, with potential to facilitate access to safe drinking water in resource-constrained settings. However, the material’s behavior as a filter is poorly understood, and challenges such as short shelf life have not been addressed. Here, we characterize the operational attributes of xylem filters and show that the material exhibits a highly non-linear dependence of flow resistance on thickness upon drying, and a tendency for self-blocking. We develop guidelines for the design and fabrication of xylem filters, demonstrate gravity-operated filters with shelf life >2 years, and show that the filters can provide >3 log removal of E. coli, MS-2 phage, and rotavirus from synthetic test waters and coliform bacteria from contaminated spring, tap, and ground waters. Through interviews and workshops in India, we use a user-centric approach to design a prototype filtration device with daily- to weekly-replaceable xylem filters, and uncover indicators of social acceptance of xylem as a natural water filter. Our work enhances the understanding of xylem as a filtration material, and opens opportunities for engineering a diverse range of low-cost, biodegradable xylem-based filtration products on a global scale.

Interdisciplinary scholarly literature considers how research processes may adversely affect their participants. Building on this work, this article addresses the processes and practices of applied research in contexts in which imbalances of power exist between researchers and those being researched. We argue that research activities in international development and humanitarian work that are typically operational, such as needs assessments, baseline studies, and monitoring and evaluation, represent interventions in the lives of participants, with the potential to create value or harm, delight or distress. The ethical and methodological dilemmas of this intervention have received less attention than purely academic discussions of human subject research. How can applied researchers meaningfully reckon with the effects of the research process on both those conducting it and those participating in it throughout the research cycle? In response, we introduce an approach co-developed over seven years through engagement with applied researchers across sectors. We discuss four interrelated principles—relevance, respect, right-sizing, and rigor—intended to invite a commitment to ongoing process improvement in the conduct of applied research. We also propose a framework to guide the implementation of these principles and illustrate the tensions that may arise in the process of its application. These contributions extend conversations about research ethics and methods to the operational research realm, as well as provide concrete tools for reflecting on the processes of operational research as sites of power that ought to be considered as seriously as the findings of data collection activities.

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