Agrobiodiversity endangered by sugarcane farming in Mumias and Nzoia Sugarbelts of Western Kenya

Commercial sugarcane farming has been practised in western Kenya for nearly forty years. This monocultural land use is associated with loss of natural vegetation and cropland, thus undermining food security status of a place. Further, sugarcane farming is a major contributor to loss of biodiversity in western Kenya. This study was therefore aimed at determining the long-term effects of sugarcane farming on indigenous food crops and vegetables in Mumias and Nzoia sugarbelts of western Kenya. Up to 188 respondents in three divisions of Mumias and 178 respondents of three divisions in Nzoia were purposively selected. These included small-scale and large-scale farmers. Data were collected using questionnaires, Participatory Rural Appraisal tool, interviews and field observations. Secondary data were obtained from documented materials. Land under indigenous food crops and vegetable has been declining since the introduction of sugarcane. Indigenous food crops and vegetable cultivation by farmers in the sugarbelts has been declining. Furthermore, some farmers have abandoned the growing of these crops altogether. Our results imply that sugarcane farming is a major contributor to agrobiodiversity erosion, but that there are also other important reasons such as change of consumer preference, land fragmentation, climate variability among others. In order to curb further loss of biodiversity, efforts should particularly focus on food crops and livelihood diversification and adoption of farming technologies such as agroforestry.Key words: Biodiversity, farming, indigenous crops, monoculture, Western Kenya

Heavy Metal Concentrations in Vegetables Cultivated and Sold in Machakos Municipality, Kenya

Heavy metal contamination of vegetables is a key aspect of food quality assurance since vegetables form a substantial proportion of the daily human diet. Health risks in urban populations due to exposure to heavy metals are on the increase because of the consumption of vegetables irrigated with wastewater. This study analyzed the concentration of Cd, Cu, Pb, Zn and Cr in spinach and kales grown using contaminated water of the Mitheu urban stream and those sold within Machakos municipality. Vegetable samples were collected once per month for a period of four months starting from June to September 2019. The mean heavy metal concentrations obtained were0.013 \u2013 3.19 mg/kg, 0.468 \u2013 1.706 mg/kg, 0.02 \u2013 0.368 mg/kg, 5.78 \u2013 26.7 mg/kg, and 0.104 \u2013 14.0 mg/kg for Cd, Cu, Pb, Zn and Cr respectively in kale samples from the different sampling sites. The heavy metal mean concentrations in spinach were 0.055 \u2013 0.575 mg/kg, 3.79 \u2013 5.55 mg/kg, 0.098 \u2013 1.49 mg/kg, 8.32 \u2013 20.7 mg/kg and 0.368 \u2013 4.43 mg/kg for Cd, Cu, Pb, Zn and Cr respectively. The mean concentrations of Cd, Pb, Zn and Cr in both spinach and kales in some of the sampling sites were above WHO permissible levels for heavy metals in vegetables for human consumption. However, the mean concentration of Cu was below WHO recommended levels. Consumption of these vegetables therefore poses a health risk to the consumers. There is need to create public awareness on the dangers of consuming contaminated vegetables. Additionally, measures to curb heavy metal pollution in Mitheu stream should be taken by the County Government of Machakos

Impact of type of child growth intervention program on caregivers’ child feeding knowledge and practices: A comparative study in Ga West Municipality, Ghana

This is the peer reviewed version of the following article: Agbozo, F., Colecraft, E., & Ellahi, B. (2015 - in press). Impact of type of child growth intervention programme on caregivers’ child feeding knowledge and practices: A comparative study in Ga West Municipality, Ghana Food Science & Nutrition. Food Science and Nutrition. DOI: 10.1002/fsn3.318, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/fsn3.318/abstract.Community-Based Growth Promotion (CBGP) delivered by community volunteers aims at enhancing the traditional Growth Monitoring and Promotion (GMP) programme delivered by community health nurses through the promotion of optimum infant and young child feeding (IYCF) leading to improved child growth. This study compared IYCF knowledge and practices among caregiver-child pairs (0-24 months) receiving child welfare services from CBGP (n=124) and GMP (n=108) programmes. Semi-structured questionnaires were used to interview caregivers on IYCF knowledge/practices and validated food frequency questionnaire used to record infants’ food intakes. Group differences were determined using Chi-square and independent samples t-tests (p<0.05; 95% CI). Mean IYCF knowledge scores were similar (CBGP:10.84±1.69 vs. GMP:10.23±1.38, p=0.062). However, more CBGP caregivers (17%) were highly knowledgeable than their GMP counterparts (5%) (p=0.011). Early breastfeeding initiation (CBGP:54% vs. GMP:28%, p<0.0001), exclusive breastfeeding (CBGP:73% vs. GMP:56%, p=0.001) and timely complementary feeding (CBGP:72% vs. GMP:49%, p=0.014) were reportedly higher among CBGP caregivers. Underweight was 11% (CBGP:8% vs. GMP:14%, p=0.154. Mean dietary diversity scores (10 food groups) were similar (CBGP:4.49±1.89 vs. GMP:3.87±1.89, p=0.057) but more CBGP caregivers (77%) achieved minimum dietary diversity than their GMP counterparts (61%) (p=0.035). Few caregivers achieved minimum meal frequency (CBGP:31% vs. GMP:29%, p=0.486) and minimum acceptable diet (CBGP:23% vs. GMP:21%, p=0.464) indicators. Number of children under 5 years owned by caregiver (AOR: 0.405; 95% CI: 1.13-78.53, p=0.038), her educational level (AOR: 0.112; 95% CI: 0.02-0.90, p=0.040) and IYCF knowledge (AOR: 0.140; 95% CI: 0.03-0.79, p=0.026) significantly predicted optimum child feeding. Nutrition education on optimum complementary feeding and birth spacing strategies should intensify

Integrated Nutrient Management: Concepts and Experience from Sub-Saharan Africa

In Africa, 28 percent of its landmass, 874 Mha, is potentially suitable for agricultural production. Of the potentially suitable agricultural land, 34 percent comprises arid and semiarid lands (ASAL) that are too dry for rainfed agriculture. The semiarid regions have a shortened length of growing period (75-129 days) compared to the subhumid (180-269 days), and the humid (>270 days) zones. The dynamics of agroecosystems show that the farming systems practiced have gone through diverse changes from traditional shifting farming systems to permanent and intensified arable and mixed farming systems. The changes are coping strategies to respond to the environment, and its changing biophysical and socioeconomic circumstances..

Predicting intercrop competition, facilitation, and productivity from simple functional traits

Open Access ArticleContext Recent meta-analyses demonstrate that intercropping can increase the land use efficiency of crop production by 20–30 % on average, indicating a strong potential contribution to sustainable intensification. However, there is substantial variability around this average: individual studies range from half to double the land productivity of monocrops. Legume-cereal intercrops and intercrops with high temporal niche separation tend to be more productive than the average, but these two combination types are not always suitable. There is a need to explore other possibilities to achieve productive intercrops. Research question We explored whether two simple functional traits involved in radiation use, plant vegetative height and specific leaf area (SLA), could be used to predict intercrop productivity. Height and SLA together are associated with key plant life-history and resource economy strategies determining competitiveness and tolerance of competition, especially with regard to light, and could therefore be expected to underpin overyielding in intercrops. Methods In the first year of our study, we grew crops as monocrops at one site in Kenya and measured their height and SLA. In the second year, we grew crops in monocrop, intercrop, and single plant treatments at two sites in Kenya and one site in Nigeria. Together, these treatments allowed us to identify whether each intercrop combination overyielded or underyielded, and whether any overyielding was driven by facilitation and/or differences in inter- vs intraspecific competition. We then related the strength of these interactions to the two traits. Results We found that intercrop grain yields varied in relation to the height and SLA of each species in the intercrop, but together these traits explained less than a third of variation in intercrop land equivalence ratios (LER). More variation could be explained by allowing for the effect of site, suggesting that the two traits interact with site conditions to determine yield. Biomass LERs responded differently to grain LERs, suggesting that plasticity in resource allocation in response to intercropping conditions may further influence yields. Conclusions Our study found some evidence that combining species with traits indicating contrasting responses to competition (an avoidant species with a tolerant species) could increase resource use complementarity and thus intercrop overyielding. However, it was clear that other factors (such as additional traits, or the trait by site interaction) are needed to refine our understanding of intercrop productivity. Implications A trait-based framework has potential to predict intercrop productivity, but simple measures of height and SLA alone are insufficient

Rapid assessment of sweetpotato seed and root production and markets in Kamuli and Iganga districts, near Eastern Uganda

The International Potato Center (CIP) and National Crops Resources Research Institute (NaCRRI) under the supervision of National Agricultural Research Organization are implementing a three-year project entitled, ‘Sweetpotato Genetic Advances and Innovative Seed Systems (SweetGAINS)’ funded by Bill and Melinda Gates Foundation (BMGF). The project aims to modernize the current Sweetpotato breeding systems and early generation seed production. SweetGAINS project is structured into work packages (WP1 - WP4) for effective and efficient implementation. As part of work package 4, a detailed rapid assessment of the sweetpotato seed system was conducted. The main objective of the study was to generate bench information to support the implementation of the sweetpotato system

Distribution of hyperglycaemia and related cardiovascular disease risk factors in low-income countries: a cross-sectional population-based survey in rural Uganda

Background Data on non-communicable disease (NCD) burden are often limited in developing countries in Africa but crucial for planning and implementation of prevention and control strategies. We assessed the prevalence of related cardiovascular disease risk factors (hyperglycaemia, high blood pressure and obesity) in a longstanding population cohort in rural Uganda

Data resource profile: network for analysing longitudinal population-based HIV/AIDS data on Africa (ALPHA Network)

The Network for Analysing Longitudinal Population-based HIV/AIDS data on Africa (ALPHA Network, http://alpha.lshtm.ac.uk/) brings together ten population-based HIV surveillance sites in eastern and southern Africa, and is coordinated by the London School of Hygiene and Tropical Medicine (LSHTM). It was established in 2005 and aims to (i) broaden the evidence base on HIV epidemiology for informing policy, (ii) strengthen the analytical capacity for HIV research, and (iii) foster collaboration between network members. All study sites, some starting in the late 1980s and early 1990s, conduct demographic surveillance in populations that range from approximately 20 to 220 thousand individuals. In addition, they conduct population-based surveys with HIV testing, and verbal autopsy interviews with relatives of deceased residents. ALPHA Network datasets have been used for studying HIV incidence, sexual behaviour and the effects of HIV on mortality, fertility, and household composition. One of the network’s substantive focus areas is the monitoring of AIDS mortality and HIV services coverage in the era of antiretroviral therapy. Service use data are retrospectively recorded in interviews and supplemented by information from record linkage with medical facilities in the surveillance areas. Data access is at the discretion of each of the participating sites, but can be coordinated by the network

Incident type 2 diabetes attributable to suboptimal diet in 184 countries

The global burden of diet-attributable type 2 diabetes (T2D) is not well established. This risk assessment model estimated T2D incidence among adults attributable to direct and body weight-mediated effects of 11 dietary factors in 184 countries in 1990 and 2018. In 2018, suboptimal intake of these dietary factors was estimated to be attributable to 14.1 million (95% uncertainty interval (UI), 13.814.4 million) incident T2D cases, representing 70.3% (68.871.8%) of new cases globally. Largest T2D burdens were attributable to insufficient whole-grain intake (26.1% (25.027.1%)), excess refined rice and wheat intake (24.6% (22.327.2%)) and excess processed meat intake (20.3% (18.323.5%)). Across regions, highest proportional burdens were in central and eastern Europe and central Asia (85.6% (83.487.7%)) and Latin America and the Caribbean (81.8% (80.183.4%)); and lowest proportional burdens were in South Asia (55.4% (52.160.7%)). Proportions of diet-attributable T2D were generally larger in men than in women and were inversely correlated with age. Diet-attributable T2D was generally larger among urban versus rural residents and higher versus lower educated individuals, except in high-income countries, central and eastern Europe and central Asia, where burdens were larger in rural residents and in lower educated individuals. Compared with 1990, global diet-attributable T2D increased by 2.6 absolute percentage points (8.6 million more cases) in 2018, with variation in these trends by world region and dietary factor. These findings inform nutritional priorities and clinical and public health planning to improve dietary quality and reduce T2D globally. (c) 2023, The Author(s)