scholarly journals Effects of Rainfall and Temperature Oscillations on Maize Yields in Buea Sub-Division, Cameroon

2017 ◽  
Vol 9 (2) ◽  
pp. 63 ◽  
Author(s):  
N. Balgah Sounders ◽  
Tata Emmanuel Sunjo ◽  
Mojoko Fiona Mbella
Keyword(s):  
Crop Yields ◽  
Secondary Data ◽  
Sub Saharan Africa ◽  
Maize Production ◽  
Climatic Oscillations ◽  
Pests And Diseases ◽  
Temperature Oscillations ◽  
Maize Yields ◽  
Sub Saharan ◽  
Sowing Season

There has been increasing concerns about the continuous variability in the climatic parameters of rainfall and temperature due to their manifold impacts. Some of these effects are observed through changes in crop yields such as maize in most parts of Sub-Saharan Africa which lacks the capital and technological viabilities to deal with the situation. This paper therefore examines the effects of the growing climatic oscillations on maize production. The study used primary and secondary data in order to provide insights on the quantitative effects of rainfall and temperature on maize yields in Buea Sub-Division. The climatic and crop trend analyses were done using simple regressions, means, and standard deviations. These were done using 2010 Excel Software. The impacts of varying rainfall and temperature on maize yields were determined using the logistic regression analysis in Stata 10 statistical software. Based on the analysis, results show that there has been growing rainfall and temperature fluctuations over Buea. This has been x-rayed through the increasing temperatures, slight declines in rainfall amounts, and the unpredictability of the sensation and the departure of the rains. Other effects have been observed through short dry spells especially in the months of April as well as increasing flooding of some farmlands in the months of August and September. Results further show that the unpredictability of the commencement of the rains has shifted the sowing season of maize by an average of four weeks and because of this situation, maize yields have increased during the minor season more than yields in the main season. Other climatic impacts were observed through increasing maize attacks from pests and diseases. As the way forward, there is the need for the development of maize germplasms that are heat-tolerant and need for the concentration of maize in the second season when soil moisture to ensure maize seed germination, growth and maturity is assured.

scholarly journals Efficacy of Risk Reducing Diversification Portfolio Strategies among Agro-Pastoralists in Semi-Arid Area: A Modern Portfolio Theory Approach

2021 ◽  
Author(s):  
Ponsian T. Sewando
Keyword(s):  
Crop Yields ◽  
Secondary Data ◽  
Sub Saharan Africa ◽  
National Bureau ◽  
Theory Approach ◽  
Portfolio Strategies ◽  
Central Regions ◽  
Sub Saharan ◽  
Positive Correlations ◽  
Semi Arid

Agro-pastoralists in the tropical semi-arid dryland areas of sub-Saharan Africa are significantly affected by climate change and variability. The agro-pastoral families are coping with production-related climatic risks through livelihood diversification to ensure food security. Data were collected from a sample of 411 agro-pastoralists across five districts in the semi-arid northern and central regions of Tanzania through survey conducted between November 2017 and July 2018. Secondary data regarding crop yields and livestock populations for eight years from 2009 to 2017 were collected from the National Bureau of Statistics and the respective District offices. Results show that about three-quarters of the agro-pastoralists managed diversified crop and livestock portfolios with two or more crops and animal species. However, simulated crop yields reveal positive correlations. Construction of integrated portfolios that generate good returns at a modest risk can be achieved through strategic choices between high-return high-risk and low-return low-risk crop and livestock activities. Thus, the paper recommends for costly long-term breeding and genotype improvement programs, strategically changing the make-up of the current crop and livestock portfolios which appear to be an affordable and tailored solution for building risk resilience among agro-pastoral communities in the drylands.

scholarly journals Improving Crop Yields in Sub-Saharan Africa - What Does the East African Data Say

2020 ◽  
Vol 20 (95) ◽  
Author(s):  
Alun Thomas
Keyword(s):  
Crop Yields ◽  
Sub Saharan Africa ◽  
Crop Damage ◽  
East African ◽  
Investment Financing ◽  
Level Data ◽  
Negative Effect ◽  
Maize Yields ◽  
Sub Saharan ◽  
Yield Determinants

Recent micro level data from East Africa is used to benchmark aggregate data and assess the role of agricultural inputs in explaining variation in crop yields on smallholding plots. Fertilizer, improved seeds, protection against erosion and pesticides improve crop yields in Rwanda and Ethiopia, but not Uganda, possibly associated with lack of use there. With all positive yield determinants in place, wheat and maize yields could increase fourfold. The data hints at the negative effect of climate change on yields and the benefits of accompanying measures to mitigate its adverse impact (access to finance and protection against erosion). The adverse effect of crop damage on yields varies between 12/13 percent (Rwanda, Uganda) to 36 percent (Ethiopia). Protection against erosion and investment financing mitigate these effects considerably.

scholarly journals Intersectional stigma and its impact on HIV prevention and care among MSM and WSW in sub-Saharan African countries: a protocol for a scoping review

BMJ Open ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. e047280
Author(s):  
Gamji M’Rabiu Abubakari ◽  
Debbie Dada ◽  
Jemal Nur ◽  
DeAnne Turner ◽  
Amma Otchere ◽  
...  
Keyword(s):  
Hiv Prevention ◽  
Data Extraction ◽  
Grey Literature ◽  
Secondary Data ◽  
Well Being ◽  
Sub Saharan Africa ◽  
African Countries ◽  
Scoping Reviews ◽  
Sub Saharan ◽  
Meta Analyses

IntroductionResearch has established that various forms of stigma (HIV stigma, gender non-conforming stigma and same-gender sex stigma) exist across Sub-Saharan Africa and have consequences for the utilisation of HIV prevention and care services. Stigmas are typically investigated in HIV literature individually or through investigating individual populations and the various stigmas they may face. The concept of intersectionality highlights the interconnected nature of social categorisations and their ability to create interdependent systems of discrimination based on gender, race, sexuality and so on. Drawing from perspectives on intersectionality, intersectional stigma denotes the convergence of multiple marginalised identities within an individual or a group, the experiences of stigma associated with these identities as well as the synergistic impact of these experiences on health and well-being. With respect to HIV, public health scholars can examine the impacts of intersectional stigmas on HIV prevention and care utilisation.Methods and analysisReviewers will search systematically through MEDLINE, Global Health, Embase, Scopus, Web of Science Core Collection and Africa Index Medicus and citations for quantitative studies, qualitative studies and grey literature that include data on stigma and HIV among men who have sex with men and women who have sex with women in Sub-Saharan Africa. Eligible studies will include primary or secondary data on stigma related to HIV risk factors experienced by this population. Studies will be written in French or English and be published between January 1991 and November 2020. All screening and data extraction will be performed in duplicate, and if discrepancies arise, they will be settled by GM’RA, LEN, DD or AO. Findings from this study will be reported according to the Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews.Ethics and disseminationEthics approval is not required as there will be no human participants and no protected data will be used in this study. We will disseminate findings through peer-reviewed manuscripts, conferences and webinars.

scholarly journals The impact of community led alternative rite of passage on eradication of female genital mutilation/cutting in Kajiado County, Kenya: A quasi-experimental study

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0249662
Author(s):  
Samuel Muhula ◽  
Anthony Mveyange ◽  
Samuel Oji Oti ◽  
Martha Bande ◽  
Hellen Kayiaa ◽  
...  
Keyword(s):  
Female Genital Mutilation ◽  
Secondary Data ◽  
Sub Saharan Africa ◽  
Rite Of Passage ◽  
Genital Mutilation ◽  
Community Stakeholders ◽  
Quasi Experimental ◽  
Sub Saharan ◽  
The Impact ◽  
Female Genital

Introduction In Kenya, Female Genital Mutilation/Cutting (FGM/C) is highly prevalent in specific communities such as the Maasai and Somali. With the intention of curtailing FMG/C prevalence in Maasai community, Amref Health Africa, designed and implemented a novel intervention—community-led alternative rite of passage (CLARP) in Kajiado County in Kenya since 2009. The study: a) determined the impact of the CLARP model on FGM/C, child early and forced marriages (CEFM), teenage pregnancies (TP) and years of schooling among girls and b) explored the attitude, perception and practices of community stakeholders towards FGM/C. Methods We utilised a mixed methods approach. A difference-in-difference approach was used to quantify the average impact of the model with Kajiado as the intervention County and Mandera, Marsabit and Wajir as control counties. The approach relied on secondary data analysis of the Kenya Demographic and Health Survey (KDHS) 2003, 2008–2009 and 2014. A qualitative approach involving focus group discussions, in-depth interviews and key informant interviews were conducted with various respondents and community stakeholders to document experiences, attitude and practices towards FGM/C. Results The CLARP has contributed to: 1) decline in FGM/C prevalence, CEFM rates and TP rates among girls by 24.2% (p<0.10), 4.9% (p<0.01) and 6.3% (p<0.01) respectively. 2) increase in girls schooling years by 2.5 years (p<0.05). Perceived CLARP benefits to girls included: reduction in teenage marriages and childbirth; increased school retention and completion; teenage pregnancies reduction and decline in FGM/C prevalence. Community stakeholders in Kajiado believe that CLARP has been embraced in the community because of its impacts in the lives of its beneficiaries and their families. Conclusion This study demonstrated that CLARP has been positively received by the Maasai community and has played a significant role in attenuating FGM/C, CEFM and TP in Kajiado, while contributing to increasing girls’ schooling years. CLARP is replicable as it is currently being implemented in Tanzania. We recommend scaling it up for adoption by stakeholders implementing in other counties that practice FGM/C as a rite of passage in Kenya and across other sub Saharan Africa countries.

Pregnancy intention and gestational age at first antenatal care visit in Lesotho

2021 ◽  
Vol 15 (1) ◽  
pp. 1-11
Author(s):  
Paul Mkandawire ◽  
Joseph Kangmennaang ◽  
Chad Walker ◽  
Roger Antabe ◽  
Kilian Atuoye ◽  
...  
Keyword(s):  
Antenatal Care ◽  
Gestational Age ◽  
Secondary Data ◽  
Universal Coverage ◽  
Sub Saharan Africa ◽  
World Health ◽  
Antenatal Visit ◽  
Life Saving ◽  
Sub Saharan ◽  
Health Organization

Background/aims With coverage of antenatal care in sub-Saharan Africa approaching a universal level, attention is now turning to maximising the life-saving potential of antenatal care. This study assessed the gestational age at which pregnant mothers make their first antenatal visit in the context of high antenatal coverage in Lesotho. Methods For the purposes of this study, secondary data from the Demographic and Health Survey of 2014 was analysed. These data were collected in 2014, via an interviewer administered questionnaire. Survival analysis was applied to the data, using Stata SE 15 to compute time ratios that estimate time to first antenatal visit in Lesotho. Results Despite near universal coverage, only 24% of mothers start antenatal care before 12 weeks of gestation, as recommended by the World Health Organization. In addition, mothers with unwanted pregnancies are most likely to delay antenatal care until later in gestation, followed by mothers with mistimed pregnancies. Education, but not wealth, correlates with the start of antenatal care. Conclusions Having achieved near universal coverage, emphasising a prompt start and adherence to recommended visits could optimise the life-saving potential of antenatal care in Lesotho.

CHAPTER 5: Maize Lethal Necrosis, An Emerging Threat to Maize Production and Food Security in Sub-Saharan Africa

2020 ◽  
pp. 81-100
Author(s):  
Joel Masanga ◽  
Steven Runo ◽  
Francis Mwatuni ◽  
Cyrus Mugambi Micheni ◽  
Paul Kuria ◽  
...  
Keyword(s):  
Food Security ◽  
Sub Saharan Africa ◽  
Maize Production ◽  
Sub Saharan

scholarly journals Validation of Consensus Quantitative Trait Loci Associated with Resistance to Multiple Foliar Pathogens of Maize

2009 ◽  
Vol 99 (5) ◽  
pp. 540-547 ◽  
Author(s):  
Godfrey Asea ◽  
Bindiganavile S. Vivek ◽  
George Bigirwa ◽  
Patrick E. Lipps ◽  
Richard C. Pratt
Keyword(s):  
Quantitative Trait Loci ◽  
Disease Severity ◽  
Quantitative Trait ◽  
Gray Leaf Spot ◽  
Sub Saharan Africa ◽  
Maize Production ◽  
Resistant Parent ◽  
Trait Loci ◽  
Sub Saharan ◽  
Corn Leaf Blight

Maize production in sub-Saharan Africa incurs serious losses to epiphytotics of foliar diseases. Quantitative trait loci conditioning partial resistance (rQTL) to infection by causal agents of gray leaf spot (GLS), northern corn leaf blight (NCLB), and maize streak have been reported. Our objectives were to identify simple-sequence repeat (SSR) molecular markers linked to consensus rQTL and one recently identified rQTL associated with GLS, and to determine their suitability as tools for selection of improved host resistance. We conducted evaluations of disease severity phenotypes in separate field nurseries, each containing 410 F2:3 families derived from a cross between maize inbred CML202 (NCLB and maize streak resistant) and VP31 (a GLS-resistant breeding line) that possess complimentary rQTL. F2:3 families were selected for resistance based on genotypic (SSR marker), phenotypic, or combined data and the selected F3:4 families were reevaluated. Phenotypic values associated with SSR markers for consensus rQTL in bins 4.08 for GLS, 5.04 for NCLB, and 1.04 for maize streak significantly reduced disease severity in both generations based on single-factor analysis of variance and marker-interval analysis. These results were consistent with the presence of homozygous resistant parent alleles, except in bin 8.06, where markers were contributed by the NCLB-susceptible parent. Only one marker associated with resistance could be confirmed in bins 2.09 (GLS) and 3.06 (NCLB), illustrating the need for more robust rQTL discovery, fine-mapping, and validation prior to undertaking marker-based selection.

scholarly journals Reconciling agriculture, carbon and biodiversity in a savannah transformation frontier

2016 ◽  
Vol 371 (1703) ◽  
pp. 20150316 ◽  
Author(s):  
L. D. Estes ◽  
T. Searchinger ◽  
M. Spiegel ◽  
D. Tian ◽  
S. Sichinga ◽  
...  
Keyword(s):  
Crop Yields ◽  
Biodiversity Loss ◽  
Transportation Costs ◽  
Sub Saharan Africa ◽  
Agricultural Expansion ◽  
Potential Yield ◽  
Cropland Area ◽  
Trade Offs ◽  
Environmental Objectives ◽  
Sub Saharan

Rapidly rising populations and likely increases in incomes in sub-Saharan Africa make tens of millions of hectares of cropland expansion nearly inevitable, even with large increases in crop yields. Much of that expansion is likely to occur in higher rainfall savannas, with substantial costs to biodiversity and carbon storage. Zambia presents an acute example of this challenge, with an expected tripling of population by 2050, good potential to expand maize and soya bean production, and large areas of relatively undisturbed miombo woodland and associated habitat types of high biodiversity value. Here, we present a new model designed to explore the potential for targeting agricultural expansion in ways that achieve quantitatively optimal trade-offs between competing economic and environmental objectives: total converted land area (the reciprocal of potential yield); carbon loss, biodiversity loss and transportation costs. To allow different interests to find potential compromises, users can apply varying weights to examine the effects of their subjective preferences on the spatial allocation of new cropland and its costs. We find that small compromises from the objective to convert the highest yielding areas permit large savings in transportation costs, and the carbon and biodiversity impacts resulting from savannah conversion. For example, transferring just 30% of weight from a yield-maximizing objective equally between carbon and biodiversity protection objectives would increase total cropland area by just 2.7%, but result in avoided costs of 27–47% for carbon, biodiversity and transportation. Compromise solutions tend to focus agricultural expansion along existing transportation corridors and in already disturbed areas. Used appropriately, this type of model could help countries find agricultural expansion alternatives and related infrastructure and land use policies that help achieve production targets while helping to conserve Africa's rapidly transforming savannahs. This article is part of the themed issue ‘Tropical grassy biomes: linking ecology, human use and conservation’.

scholarly journals Children and adolescents on anti-retroviral therapy in Bulawayo, Zimbabwe: How many are virally suppressed by month six?

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 191
Author(s):  
Silungile Moyo ◽  
Ronald Thulani Ncube ◽  
Hemant Deepak Shewade ◽  
Solwayo Ngwenya ◽  
Wedu Ndebele ◽  
...  
Keyword(s):  
Viral Suppression ◽  
Secondary Data ◽  
Tertiary Hospital ◽  
Sub Saharan Africa ◽  
Second Line ◽  
Immunodeficiency Virus ◽  
Unknown Status ◽  
Sub Saharan ◽  
Adherence Counselling ◽  
Treat All

Background: Zimbabwe is one of the countries in sub-Saharan Africa disproportionately affected by human immunodeficiency virus. In the “treat all” era, we assessed the gaps in routine viral load (VL) monitoring at six months for children (0-9 years) and adolescents (10-19 years) newly initiated on anti-retroviral therapy (ART) from January 2017 to September 2018 at a large tertiary hospital in Bulawayo. Methods: In this cohort study using secondary data, we considered first VL done within six to nine months of starting therapy as ‘undergoing VL test at six months’. We classified repeat VL≥1000 copies/ml despite enhanced adherence counselling as virally unsuppressed. Results: Of 295 patients initiated on ART, 196 (66%) were children and 99 (34%) adolescents. A total 244 (83%) underwent VL test at six months, with 161 (54%) virally suppressed, 52 (18%) unsuppressed and 82 (28%) with unknown status (due to losses in the cascade). Switch to second line was seen in 35% (18/52). When compared to children, adolescents were less likely to undergo a VL test at six months (73% versus 88%, p=0.002) and more likely to have an unknown VL status (40% versus 22%, p=0.001). Conclusion: At six months of ART, viral suppression was low and losses in the cascade high.

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