Marie Grace Ntezimana

Forest, wild, and exotic fruits are integral yet often overlooked components of agricultural landscapes in East and Southern Africa. These “hidden harvests” contribute to food and nutrition security, livelihoods, biodiversity conservation, and climate resilience, but remain marginal in dominant food system narratives and policy frameworks. This study aims to systematically synthesise existing evidence on the roles of forest, wild, and exotic fruits within agricultural landscapes of Tanzania, Uganda, Zambia, and Rwanda, with a focus on their nutritional, economic, environmental, and social contributions. A systematic review was conducted in accordance with PRISMA guidelines, drawing on peer-reviewed and selected grey literature published since 2000. Relevant studies were identified through major academic databases and screened using predefined eligibility criteria. The results indicate that fruits significantly enhance dietary diversity and micronutrient intake, provide seasonal food buffers during lean periods, and support income diversification, particularly for women and marginalised groups. Environmentally, fruit trees contribute to ecosystem services, biodiversity conservation, and climate adaptation through agroforestry and landscape-based systems. However, their potential is constrained by governance challenges, tenure insecurity, weak value chains, and policy fragmentation. The study concludes that recognising forest, wild, and exotic fruits as integral components of multifunctional agricultural landscapes is essential for advancing resilient, nutrition-sensitive, and sustainable food systems in the region.

Conflicts between crop farmers and herdsmen in Nigeria have intensified in recent decades, posing a danger to agricultural sustainability, rural livelihoods, and food security. This study investigated coping strategies that arable crop farmers have adopted in Enugu State, Nigeria, against herders’ incursions. Data were collected through the use of a structured questionnaire. According to the result, herders’ activities, including crop destruction, assaults on women, and intimidation, have severely affected livelihoods, which has resulted in reduced income and declining productivity. In response, most farmers applied some measures such as fencing, group farming, and cultivating small plots near homesteads to avoid clashing with the marauding Fulani pastoralists. Among all the measures adopted by the farmers, results reveal that only collective strategies, such as group farming and cultivating small plots close to homesteads, were sustainable. The study pointed out the limited capacity of rural households to cope alone and suggested the need for government assistance, such as the provision of less expensive protective infrastructure and stronger community security arrangements. The study recommends that the government should ensure and employ conflict management strategies through empowering traditional institutions with delegated legislation to ameliorate further occurrences. The research contributes to the body of literature by revealing the farmers’ viewpoints and strategies within the broader discourse on farmer–herder conflicts in Nigeria.

Wheat is an important crop in Rwanda; however, rapid population growth, urbanization, and shifting dietary preferences have driven demand far beyond domestic production capacity, resulting in a steady increase in imports. Closing this gap requires a variety of management strategies that jointly optimise yield, processing quality, and sustainability. This study evaluated ten widely cultivated wheat (Triticum aestivum L.) varieties in Rwanda through an integrated assessment of grain yield, quality traits, and rheological properties. Yields ranged from 4.3 to 6.3 t ha⁻¹, with Nyaruka and Gihundo achieving the highest productivity. Quality attributes, including protein content (PC), wet gluten (WG), gluten index (GI), falling number (FN), and Zeleny sedimentation value (ZSV), varied significantly, with Cyumba and Reberaho showing superior protein levels. Mixolab-based rheological analyses revealed marked diversity in dough development time, torque, and water absorption, with Keza and Nyangufi exhibiting favorable baking profiles. Statistical analyses highlighted trade-offs between yield and quality, as high-yielding varieties such as Nyaruka showed weaker baking characteristics. These findings demonstrate that linking agronomic performance with grain and dough quality traits provides a pathway towards targeted breeding, sustainable intensification, and enhanced food security. Integrating genetic selection with tailored management and processing strategies can improve both productivity and product value, strengthening the resilience and economic viability of Rwanda’s wheat sector.

Heavy metals represent long-lasting contaminants that pose significant risks to both human health and ecosystem integrity. Originating from both natural and anthropogenic activities, they bioaccumulate in organisms through the food web, leading to widespread and long-lasting contamination. Industrialization, agriculture, and urbanization have exacerbated soil and water contamination through activities such as mining, industrial production, and wastewater use. In response to this challenge, biochar produced from waste materials such as sewage sludge has emerged as a promising remediation strategy, offering a cost-effective and sustainable means to immobilize heavy metals and reduce their bioavailability in contaminated environments. Here we explore the potential of phosphate-enriched biochar, derived from sewage sludge, to adsorb and stabilize heavy metals in polluted soils. Sewage sludge was pyrolyzed at various temperatures to produce biochar. A soil incubation experiment was conducted by adding phosphate-amended biochar to contaminated soil and maintaining it for one month. Heavy metals were extracted using a CaCl₂ extraction method and analyzed using atomic absorption spectrophotometry. Results demonstrated that phosphate amendment significantly enhanced the biochar’s capacity to immobilize heavy metals. Amending soils with 2.5 wt% phosphate-enriched sewage sludge biochar led to reductions in bioavailable Cd (by 65–82%), Zn (40–75%), and Pb (52–88%) across varying pyrolysis temperatures. Specifically, phosphate-amended biochar reduced the mobility of Cd and Zn more effectively than unamended biochar, with a significant decrease in their concentrations in soil extracts. For Cu and Pb, the effectiveness varied with pyrolysis temperature and phosphate amendment, highlighting the importance of optimization for specific metal contaminants. Biochar generated from elevated pyrolysis temperatures (500 °C) showed an increase in ash content and pH, which improved their ability to retain heavy metals and limit their mobility. These findings suggest that phosphate-amended biochar reduces heavy metal bioavailability, minimizing their entry into the food chain. This supports a sustainable approach for managing hazardous waste and remediating contaminated soils, safeguarding ecosystem health, and mitigating public health risks.