scholarly journals Quantifying the prevalence of (non)-response to fertilizers in sub-Saharan Africa using on-farm trial data

Author(s):  
Generose Nziguheba ◽  
Joost van Heerwaarden ◽  
Bernard Vanlauwe

AbstractPoor and variable crop responses to fertilizer applications constitute a production risk and may pose a barrier to fertilizer adoption in sub-Saharan Africa (SSA). Attempts to measure response variability and quantify the prevalence of non-response empirically are complicated by the fact that data from on-farm fertilizer trials generally include diverse nutrients and do not include on-site replications. The first aspect limits the extent to which different studies can be combined and compared, while the second does not allow to distinguish actual field-level response variability from experimental error and other residual variations. In this study, we assembled datasets from 41 on-farm fertilizer response trials on cereals and legumes across 11 countries, representing different nutrient applications, to assess response variability and quantify the frequency of occurrence of non-response to fertilizers. Using two approaches to account for residual variation, we estimated non-response, defined here as a zero agronomic response to fertilizer in a given year, to be relatively rare, affecting 0–1 and 7–16% of fields on average for cereals and legumes respectively. The magnitude of response could not be explained by climatic and selected topsoil variables, suggesting that much of the observed variation may relate to unpredictable seasonal and/or local conditions. This implies that, despite demonstrable spatial bias in our sample of trials, the estimated proportion of non-response may be representative for other agro-ecologies across SSA. Under the latter assumption, we estimated that roughly 260,000 ha of cereals and 3,240,000 ha of legumes could be expected to be non-responsive in any particular year.

2017 ◽  
Vol 85 ◽  
pp. 1-11 ◽  
Author(s):  
Atsuko Tanaka ◽  
Jean-Martial Johnson ◽  
Kalimuthu Senthilkumar ◽  
Cyriaque Akakpo ◽  
Zacharie Segda ◽  
...  

2009 ◽  
Vol 45 (1) ◽  
pp. 35-46 ◽  
Author(s):  
J. ACHALEKE ◽  
M. VAISSAYRE ◽  
T. BREVAULT

SUMMARYIn sub-Saharan Africa, the bollworm complex, including Helicoverpa armigera, Diparopsis watersi and Earias spp., threatens the continued success of cotton production. Pyrethroid resistance in H. armigera led to serious crop losses while endosulfan, a suitable alternative to pyrethroids, was banned for cotton pest management. Five candidates with no cross-resistance to pyrethroids were evaluated in both on-station and on-farm trials from 2002 to 2006. Two applications were made at the early peak of H. armigera infestation in September, the period when pyrethroid use should be restricted for resistance management purposes. Results showed that, as expected, bollworm infestation consistently peaked from mid-September to mid-October. Spinosad, thiodicarb and emamectin-benzoate were the most suitable alternatives to reduce damage, regardless of the cotton bollworm species. Indoxacarb and lufenuron were less effective in controlling D. watersi. On-farm experiments confirmed the suitability of spinosad for control of pyrethroid-resistant H. armigera, particularly on late sown fields. These new chemistries offer control of bollworms which justify their relevance for pyrethroid resistance management in Cameroon and sub-Saharan Africa.


2022 ◽  
Vol 12 (2) ◽  
pp. 792
Author(s):  
Christin Baumgärtel ◽  
Thea Lautenschläger ◽  
Mazekana H. G. Panzo ◽  
Francisco Afonso ◽  
Christoph Neinhuis ◽  
...  

High metal contents of acidic soils from sub-Saharan Africa often prevent the cultivation of crops and lead to a low livestock yield. The carbohydrate rich diet of the Angolan population is low in minerals and vitamins, resulting in various deficiency syndromes and a high child mortality rate. Eight traditionally utilized plants (Anisophyllea quangensis, Annona stenophylla subsp. cuneata, Canarium schweinfurthii, Eugenia malangensis, Landolphia lanceolata, Raphionacme madiensis, Tristemma mauritianum, Vitex madiensis subsp. madiensis) with nutritional value for the Angolan population were analyzed for their soil and growing conditions. The species are adapted to the local conditions and can serve as crops for the unfavorable soils of the province Uíge. Chemical and physical characteristics of the uppermost soil (0–5 cm) and in 30 cm depth were analyzed. The plant-available macro-and micronutrients were determined using Mehlich 3 extraction. Data are completed with leaf tissue analyses, examining the uptake of minerals. As aluminum (Al) and manganese (Mn) are plant-available in high amounts, local plants evolved mechanisms dealing with those metals. These Al accumulators with foliar contents above 1000 mg/kg are Anisophyllea quangensis (7884 mg/kg), Landolphia lanceolata (6809 mg/kg), Tristemma mauritianum (4674 mg/kg), and Eugenia malangensis (13,989 mg/kg). All four species bear edible fruits with nutritional potential. The domestication and commercialization of those plants seem to be promising, utilizing local soils without expensive amelioration techniques.


Author(s):  
Rhys Jenkins

The growth of China and its re-emergence as a major economic power has been a key feature of globalization in the twenty-first century. China has become an increasingly significant actor in the global economy, and this is likely to continue in the foreseeable future. The implications of this for Sub-Saharan Africa (SSA) and Latin America and the Caribbean (LAC) have been a source of major debate. This book examines the arguments drawing on a growing body of research on China’s economic involvement in SSA and LAC. It begins by considering the process of economic reform in China from the late 1970s that provided the basis for China’s growing integration with the global economy. It considers four aspects of this integration: the growth of China as a global manufacturing centre, its impact on global commodity markets, the overseas expansion of Chinese firms as part of the ‘Go Global’ policy, and the increased role of China in global capital flows. Discussion of China’s impact on SSA and LAC is characterized by disagreements over both the extent of its presence and the underlying drivers. The book documents the different forms of Chinese economic involvement and clarifies some of the confusion that has arisen over the extent of China’s presence. It then analyzes the economic, social, political, and environmental impacts of China on both regions, to show a much more varied picture than the one that is often presented. These impacts depend to a significant extent on local conditions and actors, and cannot simply be read off as a consequence of Chinese expansion.


Author(s):  
Hippolyte Fofack

Although development generally refers to a broad concept, the quest for development in sub-Saharan Africa has been biased by ideological considerations which made abstraction of local conditions and people’s aspirations. The prevalent development models have used increased national income as a sufficient statistics for broad-based development. This chapter argues for an alternative and a more comprehensive and reflexive development framework that harnesses local and global knowledge and advocates generalized balanced growth and structural transformation to move sub-Saharan African countries towards self-reliance—their collectively defined aspirational goal. Analytically, it shows that the potential development outcomes of the region under such an endogenous framework would be superior to the results achieved under the prevailing development models.


2001 ◽  
Vol 17 (suppl) ◽  
pp. S37-S46 ◽  
Author(s):  
Johann Baumgärtner ◽  
Markus Bieri ◽  
Giuseppe Buffoni ◽  
Gianni Gilioli ◽  
Hiremagalur Gopalan ◽  
...  

A concept of an ecosystem approach to human health improvement in Sub-Saharan Africa is presented here. Three factors mainly affect the physical condition of the human body: the abiotic environment, vector-transmitted diseases, and natural resources. Our concept relies on ecological principles embedded in a social context and identifies three sets of subsystems for study and management: human disease subsystems, natural resource subsystems, and decision-support subsystems. To control human diseases and to secure food from resource subsystems including livestock or crops, integrated preventive approaches are preferred over exclusively curative and sectorial approaches. Environmental sustainability - the basis for managing matter and water flows - contributes to a healthy human environment and constitutes the basis for social sustainability. For planning and implementation of the human health improvement scheme, participatory decision-support subsystems adapted to the local conditions need to be designed through institutional arrangements. The applicability of this scheme is demonstrated in urban and rural Ethiopia.


2020 ◽  
Vol 162 (3) ◽  
pp. 1213-1229 ◽  
Author(s):  
Oscar J. Cacho ◽  
Jonathan Moss ◽  
Philip K. Thornton ◽  
Mario Herrero ◽  
Ben Henderson ◽  
...  

Abstract Climate change is threatening food security in many tropical countries, where a large proportion of food is produced by vulnerable smallholder farmers. Interventions are available to offset many of the negative impacts of climate change on agriculture, and they can be tailored to local conditions often through relative modest investments. However, little quantitative information is available to guide investment or policy choices at a time when countries and development agencies are under pressure to implement policies that can help achieve Sustainable Development Goals while coping with climate change. Among smallholder adaptation options, developing seeds resilient to current and future climate shocks expected locally is one of the most important actions available now. In this paper, we used national and local data to estimate the costs of climate change to smallholder farmers in Malawi and Tanzania. We found that the benefits from adopting resilient seeds ranged between 984 million and 2.1 billion USD during 2020–2050. Our analysis demonstrates the benefits of establishing and maintaining a flexible national seed sector with participation by communities in the breeding, delivery, and adoption cycle.


2016 ◽  
Vol 55 (S1) ◽  
pp. 169-190 ◽  
Author(s):  
KATRIEN DESCHEEMAEKER ◽  
ESTHER RONNER ◽  
MARY OLLENBURGER ◽  
ANGELINUS C. FRANKE ◽  
CHARLOTTE J. KLAPWIJK ◽  
...  

SUMMARYThe large diversity of farms and farming systems in sub-Saharan Africa calls for agricultural improvement options that are adapted to the context in which smallholder farmers operate. The socio-ecological niche concept incorporates the agro-ecological, socio-cultural, economic and institutional dimensions and the multiple levels of this context in order to identify which options fit best. In this paper, we illustrate how farming systems analysis, following the DEED cycle of Describe, Explain, Explore and Design, and embedding co-learning amongst researchers, farmers and other stakeholders, helps to operationalize the socio-ecological niche concept. Examples illustrate how farm typologies, detailed farm characterization and on-farm experimental work, in combination with modelling and participatory approaches inform the matching of options to the context at regional, village, farm and field level. Recommendation domains at these gradually finer levels form the basis for gradually more detailed baskets of options from which farmers and other stakeholders may choose, test and adjust to their specific needs. Tailored options identified through the DEED cycle proof to be more relevant, feasible and performant as compared to blanket recommendations in terms of both researcher and farmer-identified criteria. As part of DEED, on-farm experiments are particularly useful in revealing constraints and risks faced by farmers. We show that targeting options to the niches in which they perform best, helps to reduce this risk. Whereas the conclusions of our work about the potential for improving smallholders’ livelihoods are often sobering, farming systems analysis allows substantiating the limitations of technological options, thus highlighting the need for enabling policies and institutions that may improve the larger-scale context and increase the uptake potential of options.


2018 ◽  
Vol 24 (4) ◽  
pp. 414-434 ◽  
Author(s):  
Desmond Tutu Ayentimi ◽  
John Burgess ◽  
Kantha Dayaram

Purpose This study aims to investigate whether the historical and institutional re-construction of Ghana support the transfer of human resource management (HRM) practices and if so, what local conditions support such transfer? Design/methodology/approach The paper draws from an exploratory qualitative study design by assimilating history, culture and institutions (social institutionalist perspective) to explore host-country factors and conditions supporting the transfer of HRM practices in a developing country context. Findings The study finds the colonial history, and the political and economic interests of Ghana to mimic best HRM policies and practices from its colonial masters and other advanced economies provided strong institutional support for the transfer of HRM practices. Research limitations/implications This paper complements the understanding of HRM practice transfer literature by highlighting the significance of host-country historical and institutional re-construction support in developing economies as key drivers for the diffusion of HRM practices. Practical implications By incorporating institutions, history and culture to form the underpinning social context, it offers a new perspective into how historical, cultural and colonial institutional legacies as entrenched social instruments facilitate HRM practice transfer in Sub-Saharan Africa. Originality/value The integration of institutions, history and culture (social institutionalist perspective) provide a wider understanding of factors that denote the effect of Ghanaian contextual distinctiveness as against the continued colonial institutional legacies (inheritance) supporting the transfer of HRM practices. This is the first study to consider how local institutions, culture and history of Ghana support the transfer of HRM practices to subsidiaries.


2020 ◽  
Vol 12 (12) ◽  
pp. 5112
Author(s):  
Linda Menk ◽  
Christian Neuwirth ◽  
Stefan Kienberger

Millions of people fall ill with malaria every year—most of them are located in sub-Saharan Africa. The weight of the burden of malaria on a society is determined by a complex interplay of environmental and social factors, including poverty, awareness and education, among others. A substantial share of the affected population is characterized by a general lack of anticipation and coping capacities, which renders them particularly vulnerable to the disease and its adverse side effects. This work aims at identifying interdependencies and feedback mechanisms in the malaria social vulnerability system and their variations in space by combining concepts, methods and tools from Climate Change Adaptation, Spatial Analysis, and Statistics and System Dynamics. The developed workflow is applied to a selected set of social, economic and biological vulnerability indicators covering five East-African Nations. As the study areas’ local conditions vary in a multitude of aspects, the social vulnerability system is assumed to vary accordingly throughout space. The study areas’ spatial entities were therefore aggregated into three system-regions using correlation-based clustering. Their respective correlation structures are displayed as Causal Loop Diagrams (CLDs). While the three resulting CLDs do not necessarily display causal relations (as the set of social vulnerability indicators are likely linked through third variables and parts of the data are proxies), they give a good overview of the data, can be used as basis for discussions in participatory settings and can potentially enhance the understanding the malaria vulnerability system.


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