School of Agriculture
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Item The potential for index-based crop insurance to stabilize smallholder farmers' gross margins in Northern Ghana(Agricultural Systems, 2024) Adelesi,O.O.; Kim,Y.U.; Schuler,J.; Zander,P.; Njoroge,M.M.; Waithaka,L.; Abdulai,A.L.; MacCarthy,D.S.; Webber,H.Context: Smallholder farmers in semi-arid West Africa face challenges such as weather variability, soil infertility, and inadequate market infrastructure, hindering their adoption of improved farming practices. Economic risks associated with uncertain weather, production and market conditions often result in measures such as selling assets and withdrawing children from school, resulting in long-term impoverishment. To break these poverty traps, there is a need for affordable and sustainable risk management approaches at the farm level. Proposed strategies include risk reduction through stress-resistant crop varieties and diversification, additional investments transfer options like crop insurance and contract farming. Despite experimentation with insurance products in sub-Saharan Africa, low adoption persists due to many factors including high premiums, imperfect indices, and cognitive factors.Item Optimization of cassava (Manihot esculenta Crantz) grafting technique to enhance its adoption in cassava cultivation(MethodsX, 2024) Opoku-Agyemang, F.; Amissah, J.N.; Owusu-Nketia, S.; Ofori, P.A.; Notaguchi, M.Grafting techniques have been successfully adopted to improve resistance to biotic and abiotic stresses, increase yields, fruit quality and study systemic signaling in plants. This technique has not been fully explored in cassava and there is currently no standardized grafting method for this species published especially in Africa. This is the first report on cassava grafting protocol in Africa with valuable advantages including utilizing a cost-effective and environmentally friendly wooden healing chamber. In this study, we describe an optimized cleft grafting protocol for cas sava utilizing a wooden healing chamber and outline the step-by-step procedure with optimum conditions to generate a high grafting success rate. Using a top wedge grafting technique with high reproducibility and success rates, we developed a straightforward and robust grafting protocol for cassava (M. esculenta) cultivars. Grafting success was recorded and this protocol produced a high grafting success of 90 % and its reproducibility makes it suitable for mass production thereby addressing the need for efficient cassava propagation. This grafting protocol requires less special ized equipment and expertise making it more accessible to farmers and researchers with limited resources to promote the use of grafting for cassava growth, yield improvement and advanced studies such as systemic long-distance signaling in plants. • Optimization of cleft grafting method obtains a high success grafting rate of cassava. • A wooden healing chamber provides a controlled environment for graft healing. • Promoting cassava grafting; a priority to produce new cultivars and explore breeding research prospects.Item The African Plant Breeders of Tomorrow(African Journal of Food, Agriculture, Nutrition and Development, 2019) Mumm, R.H.; Danquah, E.Y.Advances in agricultural productivity in Africa have lagged, as reflected by the fact that varieties have often popular with farmers for more than 14 years (Walker et al. 2015). The distribution and adoption of improved crop varieties has been stymied in part by an insufficient number of plant breeders on the continent. Would-be plant breeders often chose to pursue MS- and PhD-degree programs in the USA or Europe, and more than half of these did not return to Africa to practice their profession once graduated (Ali et al. 2007). The University of Ghana determined to change this by establishing the West Africa Centre for Crop Improvement (WACCI) in 2007, in partnership with Cornell University, to offer quality education and training in Genetics and Plant Breeding to African students. Supported by the Alliance for a Green Revolution in Africa (AGRA) as part of a strategy to launch a Green Revolution in Africa, WACCI aimed to create a sizeable, innovative workforce to increase agricultural productivity and ensure food security, especially for the people of west and central Africa. Professor Eric Yirenkyi Danquah, a visionary leader, was appointed to establish and direct WACCI. He determined to create a pathway from BS to MS to PhD in plant breeding at the University of Ghana to serve students from both English-speaking and French-speaking countries and to attract both men and women into the program, to establish WACCI as a leading institution for plant breeding education on the global stage.Item organ histology(Journal of Applied Poultry Research, 2024) Agbehadzi, R. K .; Adjei-Mensah, B.; Sasu, P.; Bilalissi, A.; Kpomasse, C.C.; N’nanle, O.; Hamidu, J. A.; Tona, K.This study examines how the combination of layer breeder age and oxygen concentration in the incubator impacts Chorioallantoic (CAM) vascularization, embryo and chick organs, blood profiles, and organ histology at hatch. Nine hundred (900) eggs from 33 to 50 wk ISA breeders were incubated at different O2 levels (15%, 17%, and 21%). Results showed signifi cant interactions between breeder age and oxygen levels, affecting liver and heart weights, blood indices, and CAM vascularity. Hypoxic conditions led to adaptive changes in embryonic organs, with notable differences between breeder age groups, suggesting that mild hypoxia can influence compensatory growth, depending on exposure stages.Item Determinants of livelihood diversification in an integrated agricultural and non-agricultural livelihood system in Ghana(Scientific African, 2024) Kolog, J.D.; Asem, F.E.; Mensah-Bonsu, A.; Atinga, R.A.; et al.The diversification of livelihoods by households has been widely acknowledged as a way to overcome food insecurity and poverty challenges in developing countries. Diversification of livelihoods help spread the risk among multiple livelihoods earning activities to provide house holds with a range of their food needs all year round. By examining the integrated livelihood systems of 405 rural farm households in the Upper East Region of Ghana, empirical evidence is provided in this study using the Sustainable Livelihoods Framework to advance arguments in the literature for the creation of sustainable strategies that improve diversified livelihood systems. The mean diversification indices estimated were 0.45 for agricultural diversification systems, 0.32 for non-agricultural diversification systems and 0.59 for integrated agricultural and nonagricultural diversification systems. With the use of the Cragg two-step regression model, we demonstrate that the decision to diversify and the extent of diversification of rural livelihoods are distinct decisions and are influenced by distinct sets of factors. Similarly, for the three categories of livelihood diversification studied, the effect of these factors also differed. The results emphasize the significance of access to good road network, credit and market information in encouraging rural farm households to diversify their livelihoods. In the short term, improving access to credit and market information through community-based initiatives can provide immediate support to rural households. Communities should also organize local markets and cooperatives to strengthen their economic resilience. While government and stakeholders should focus on long-term infra structure projects, these community actions can complement such efforts and contribute to achieving global and regional goals targeting food insecurity and poverty eradicationItem Determinants of an extended metric of agricultural commercialization in Ghana(Scientific African, 2024) Abu , B.M.; Sarpong, D.B.; Osei-Asare, Y.B.; Okyere, C.Y.; Kim.T.For smallholder farmers in sub-Saharan Africa, increasing productivity and agricultural commercialization are mooted as one of the pillars for agricultural development. However, the measurement of agricultural commercialization has been restricted to the household crop commercialization index (HCCI) that focuses on crops neglecting livestock. This study develops an extended metric of agricultural commercialization named household crop-livestock commer cialization index (HCLCI), which combines crop and livestock commercialization with the argument that it is superior to the overly used HCCI. Fractional regression is used to estimate the determinants of the extended metric using secondary and primary data from Ghana. Results indicate that agricultural commercialization is low when examined with the HCCI and the HCLCI. However, the HCLCI (at 26.44 % and 29.76 %, respectively, for the GLSS7 and primary data) is much lower relative to the HCCI (at 35.20 % and 38.24, respectively) but higher than the live stock commercialization index (10.93 % and 8.21 %, respectively). The underlying simultaneous factors that boost agricultural commercialization are infrastructure variables (i.e., road, market, transport, and bank), institutional variable (i.e., agricultural cooperatives) and scale of produc tion (i.e., land endowment and crop production diversity). These findings imply that Ghana needs to invest in infrastructure and farmer institutional development to boost agricultural commercialization.Item Effect of thermal and non-thermal processing on Technofunctional, nutritional, safety and sensorial attributes of potato powder(Food Chemistry: X, 2024) Waseem, M.; Akhtar, S.; Tutu, C. O.; et al.Potato is a highly nutritious staple food however, it also contains some antinutrients like alkaloids, phytates, tannins, oxalates as well as pesticide residues. Therefore, this study was conducted to reduce the loads of antinutrients and pesticides in potato powder (PP) using thermal and non-thermal processing techniques. Nutritional analysis revealed that the raw PP contained significantly (p < 0.05) higher magnitudes of dietary proteins (10.2 %), fibers (6.3 %), Na (50 mg/100 g), Ca (62 mg/100 g) and K (988 mg/100 g) when compared with the processed PP. The results demonstrated that all thermal and non-thermal processing techniques significantly reduced the antinutrients and pesticide residues. However, microwave heat treatment anticipated the highest reduction in alkaloids, oxalates, tannins and phytates contents from 60 to 14 mg/100 g (76 % reduction), 31–6 mg/100 g (80 % reduction), 91–15 mg/100 g (84 % reduction) and 45–8 mg/100 g (82 % reduction), respectively. Additionally, microwave heat processing also exhibited the highest decline in imidacloprid, cypermethrin, bifenthrin, chlorpyrifos and deltamethrin contents by 87 %, 76 %, 63 %, 79 % and 81 %, respectively. Later, microwave-treated PP (the most effective treatment) was used to develop unleavened flatbreads (i.e., chapatis) @ 2–10 %. Organoleptic evaluation of supplemented flatbreads suggested that 5 % sup plementation with microwave treated PP has the highest overall acceptability. Therefore, it is concluded that thermal and non-thermal processing techniques are effective tools to reduce loads of antinutrients and pesticide burden in potatoes. Moreover, the study also suggests, PP can be efficiently used as natural food supplement for development of value-added foods.Item A process evaluation of a home garden intervention(Agriculture & Food Security, 2024) Ritter, T.; Mockshell, J.; Garrett, J.; Ogutu, S.; Asante‑Addo, C.Background Most reviews of nutrition-sensitive programs assess the evidence base for nutrition outcomes with out considering how programs were delivered. Process evaluations can fill this void by exploring how or why impacts were or were not achieved. This mid-term process evaluation examines a home garden intervention implemented in a large-scale, livelihoods improvement program in Odisha, India. The objectives are to understand whether the intervention was operating as planned (fidelity), investigate potential pathways to achieve greater impact, and provide insights to help design future home garden programs. Methodology Data collection and analysis for this theory-driven process evaluation are based on a program impact pathway that shows the fow of inputs, processes, outputs, outcomes, and impacts. Quantitative and qualitative data from focus group discussions, semi-structured interviews, and a Process Net-Mapping exercise with benefciaries frontline workers, and program management staff. Results Despite a mismatch between the design and implementation (low fidelity), the process evaluation identified positive outputs, outcomes, and impacts on home garden production, consumption, income, health and nutritional outcomes, and women’s empowerment. Flexibility led to greater positive outcomes on nutrition, the adoption of sus‑ tainable agricultural practices and easy-to-understand nutrition models, and the likelihood of the intervention being sustained after the program ends. Conclusions To help food systems in rural settings reduce food insecurity by utilizing more sustainable agricultural practices, we recommend that home garden interventions include instruction on easy-to-understand nutrition models and on how to make natural fertilizer. Finding local solutions like home gardens to help address critical supply issues and food insecurity is paramountItem Differential Impact of Land Use Types on Soil Productivity Components in Two Agro-ecological Zones of Southern Ghana(African Handbook of Climate Change Adaptation, 2021) Owoade, F.M.; Adiku, S.G.K.; MacCarthy, D.S.; et al.The maintenance of soil productivity is important for sustained crop yield in low-input systems in the tropics. This study investigated the impact of four different land use types, namely, maize and cassava cropping, woodlot/plantations, and natural forests on soil productivity components, especially soil carbon accretion, at six sites within two agro-ecological zones of southern Ghana. Soil properties were significantly different between sites and ecological zones. The coastal savanna zone, which is a low rainfall zone had relatively lower soil carbon storage than the high rainfall forest-savanna transition zone. Soil productivity conditions in the latter zone were much more favorable for cropping than the former. Land use types significantly affected the soil carbon (SOC) storage within the two ecological zones. In the low rainfall zone, soil carbon accretion by maize cropping, cassava cropping, and plantations was 48%, 54%, and 60%, respectively, of the forest carbon stock (47,617 kg/ha). In the transition zone, the soil carbon accretion was over 90% of the forest value (48,216 kg/ha) for all land use types. In effect, the use of land use types in maintaining soil productivity must consider the conditions in a given ecological zone.Item Implications of crop yield distributions for multiperil crop insurance rating in Ghana: a lasso model application(Agricultural Finance Review, 2024) Addey, K.A.; Jatoe, J.B.D.Purpose – The objective of this paper is to examine crop yield predictions and their implications on MPCI in Ghana. Farmers in developing countries struggle with their ability to deal with agricultural risks. Providing aid for farmers and their households remains instrumental in combatting poverty in Africa. Several studies have shown that correctly understanding and implementing risk management strategies will help in the poverty alleviation agenda. Design/methodology/approach – This study examines the importance of crop yield distributions in Ghana and its implication on multiperil crop insurance (MPCI) rating using the Lasso regression model. A Bonferroni test was employed to test the independence of crop yields across the regions while the Kruskal-Wallis H test was conducted to examine statistical differences in mean yields of crops across the ten regions. The Bayesian information criteria and k-fold cross-validation methods are used to select an appropriate Lasso regression model for the prediction of crop yields. The study focuses on the variability of the threshold yields across regions based on the chosen model. Findings – It is revealed that threshold yields differ significantly across the regions in the country. This implies that the payment of claims will not be evenly distributed across the regions, and hence regional disparities need to be considered when pricing MPCI products. In other words, policymakers may choose to assign respective weights across regions based on their threshold yields. Research limitations/implications – The primary limitation is the unavailability of regional climate data which could have helped in a better explanation of the variation across the regions. Originality/value – This is the first study to examine the implications of regional crop yield variations on multiperil crop insurance rating in Ghana.