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Reaction of oriental tobacco to spacing and topping treatments at three levels of nitrogenous fertilizer application
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.P. Lamprecht --- , W. J.C. van der Merwe --- ,Three levels of nitrogenous fertilizer were applied to oriental tobacco (Nicotiana tabacum L. cv. Elcatra) at different spacings and topped to 14 and 28 leaves per plant respectively. Yield, income, total nitrogen and total alkaloids of the cured leaves increased,... -
Effect of Ca, K and B supply on water-stress induced chlorophyll loss from tobacco and cotton leaf discs
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: ElizabethA. Davies --- , England N. J.J. Combrink --- , Republic of South AfricaA study was made of the influence of Ca:K ratios and B levels on the chlorophyll content of tobacco and cotton leaves grown under glasshouse conditions. Excised leaf discs were floated on a solution of polyethylene glycol 6000 to study... -
Improving the fermentation ability of unripe air-cured tobacco
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.G. Nel --- , Republic of South Africa C.R. Wall --- , Republic of South AfricaThe fermentation of dark air-cured tobacco depends on its fermentation ability. Dry spells during the growth period can contribute towards unripe tobacco with poor fermentation ability. By blending such tobacco at a 1:1 ratio with tobacco of good fermentation ability,... -
Effect of Ca, K and B supply on growth of cotton (Gossypium hirsutum L.) and tobacco (Nicotiana tabacum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- , Republic of South Africa ElizabethA. Davies --- , EnglandThe effect of Ca:K ratios and B nutrition was investigated using tobacco and cotton grown in Mitcherlich pots with sand. A nutrient solution with three different ratios of Ca:K and two boron levels was used. Treatments were arranged factorially (3... -
'n Evaluasie van twee chromatografiese metodes vir die roetine-bepaling van nikotien en nornikotien in tabak
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.G. Nel --- , Republiek van Suid-AfrikaTen einde 'n geskikte metode op 'n tyd- en kostebasis te vind vir die roetine-ontleding van nornikotien in tabakmonsters, is twee tegnieke van individuele alkaloïedbepalings vergelyk. Met die dunlaagchromatografiese metode kon sewe verskillende alkaloïedes in een van die monsters wat... -
Reciprocal differences in intraspecies crosses of tobacco (Nicotiana tabacum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa M.P. Lamprecht --- , Republic of South Africa H. van Ark --- , Republic of South AfricaReciprocal differences in a diallel cross experiment with air-cured tobacco strains were found to be significant for certain characteristics, but relatively small compared to differences between strains in general combining ability. A factorial analysis designed to detect maternal effects in... -
Yield and quality of flue-cured tobacco (Nicotiana tabacum L.) as affected by calcium, magnesium, potassium and boron
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- , Republic of South AfricaA field trial was carried out with flue-cured tobacco on a Shorrocks soil series at the Loskop research station. Different levels of K, Ca and Mg in the soil were obtained after two annual applications of these cations in the... -
Die invloed van kalsium en magnesium op die groei van tabakplante en opname van kalium, kalsium en magnesium in waterkultuur
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.J. Steenkamp --- , Republiek van Suid-Afrika J.A. de Bruyn --- Departement Plantkunde, Republiek van Suid-Afrika A.A. Theron --- Departement Grond- en Waterboukunde, Republiek van Suid-Afrika'n Toename in the Ca-konsentrasie van 'n voedingsoplossing het 'n verhoging in biomassa tot gevolg gehad asook 'n verhoogde opname van K en Ca deur tabakplante. Die opname van Mg aan die anderkant word onderdruk deur toenemende konsentrasies van Ca... -
The effect of nitrogen and manganese on the aroma of flue-cured tobacco
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.S. Whitehead --- Department of Botany, Republic of South Africa C.J. Steenkamp --- , Republic of South AfricaSeveral volatile compounds are produced on curing fully aromatic tobacco leaves. In contrast, no volatiles are produced by ‘putty’ leaves. A clear correlation exists between the production of flavour compounds and the retention of structural integrity in the leaves after... -
Die invloed van kultivar, stikstofbemesting en tophoogte op die kwaliteit van oonddroogtabak I. Fisiese kwaliteit en opbrengs
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.J. Malan --- Departement Plantproduksie en Grondkunde, Republiek van Suid Afrika P.S. Hammes --- Departement Plantproduksie en Grondkunde, Republiek van Suid Afrika M.C. Dippenaar --- Navorsingsinstituut vir Tabak en Katoen, Republiek van Suid AfrikaDie toenemende vraag na goeie kwaliteit oonddroogtabak het aanleiding gegee tot navorsing om te bepaal watter rol stikstofbemesting, tophoogte en kultivars speel. Vyf oonddroogtabakkultivars (TL 33, OD86, A4, OD224 en OD212) is in 'n veldproef onderwerp aan drie stikstofbemestingspeile (70,... -
Die invloed van kultivar, stikstofbemesting en tophoogte op die kwaliteit van oonddroogtabak II. Chemiese kwaliteit
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.J. Malan --- Departement Plantproduksie en Grondkunde, Republiek van Suid Afrika P.S. Hammes --- Departement Plantproduksie en Grondkunde, Republiek van Suid Afrika M.C. Dippenaar --- , Republiek van Suid AfrikaDie toenemende vraag na beter kwaliteit oonddroogtabak, het aanleiding gegee tot navorsing om te bepaal watter rol stikstofbemesting, tophoogte en kultivar speel. Vyf oonddroogtabakkultivars (TL33, OD86, A4, OD224 en OD212) is in 'n veldproef onderwerp aan drie stikstofbemestingspeile (70, 100... -
Detecting nitrogen deficiency on irrigated cash crops using remote sensing methods
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Fouche --- Department of Soil Science, Republic of South AfricaEarly detection of nitrogen deficiency on annual agricultural crops can assist the management of N-fertilization to improve crop yields. Low altitude aerial photography is an inexpensive means to assess crop canopy radiation in the near infrared range. In this study,... -
Tobacco Use Trends among Adolescents and Adults in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- Human Sciences Research Council & University of the Free State,The purpose of this review is to synthesize the national prevalence data from eight surveys on tobacco use in South Africa over the past 13 years. Results from the national studies indicate that tobacco use among adults is on the... -
Tobacco Use and Associated Factors in Older Adults in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- Human Sciences Research Council, South Africa Nancy Phaswana-Mafuya --- Human Sciences Research Council, South AfricaThis study aimed to determine the prevalence of tobacco use and their associated factors in older South Africans. We conducted a national population-based cross-sectional study with a sample of 3840 aged 50 years or older in South Africa in 2008... -
Prevalence, Correlates and Perceptions Toward Cigarette Smoking Among Male and Female In-School Adolescents (Aged 11–18 years) in South Africa: Results from the 2008 GYTS Study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- Human Sciences Research Council, South AfricaThe aim of this study was to estimate the prevalence and identify correlates of current cigarette use among 8470 school-going adolescents (aged 11 to 18 years) in South Africa. A cross-sectional study was carried out in 2008 in South Africa... -
Community Participation in Tobacco Control in a Nigerian Setting
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Catherine O. Egbe --- University of KwaZulu-Natal, South Africa Inge Petersen --- University of KwaZulu-Natal, South Africa Anna Meyer-Weitz --- University of KwaZulu-Natal, South AfricaThis study explored the role of cultural factors in tobacco use in a Nigerian setting. Participants were 27 community members: community leaders (5), political analysts/officials of non-governmental organisations (4) and 18 young tobacco users (age range 18 and 24 years)... -
Substance abuse and anaesthesia—Part 2
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Christina Lundgren --- Department of Anaesthesia,Tobacco and alcohol remain the most abused substances in South Africa and elsewhere in the western world. Tobacco is commonly smoked, but in South Africa it is also “sniffed” as snuff, and if inhaled causes as much damage as inhaled... -
Smokeless tobacco: is it really safe?
Item type: Journal Article • Journal: South African Family Practice • Authors: OB Omole --- Department of Family Medicine, GA Ogunbanjo --- Department of Family Medicine and PHC,Antismoking campaigns and government legislation have resulted in a decline in smoking. However, the use of smokeless tobacco (SLT) is on the increase. Smokeless tobacco is non-smoked tobacco used either intranasally or intraorally. The increase in its use is possibly... -
Nicotine-replacement therapy: a proven treatment for smoking cessation
Item type: Journal Article • Journal: South African Family Practice • Authors: N Robson --- Department of Primary Care Medicine, Faculty of Medicine, MalaysiaSmoking is a major cause of cardiovascular diseases, respiratory diseases and cancer. Despite the high prevalence of smokers worldwide, smokers are often neglected and not offered effective assistance with quitting their habits. In order to overcome this public health burden,... -
Varenicline: a new pharmacotherapy for smoking cessation in primary care practice
Item type: Journal Article • Journal: South African Family Practice • Authors: N Robson --- University Malaya, MalaysiaBackground: Cigarette smoking causes significant morbidity and mortality and is a major public health concern worldwide. Primary care doctors are in a unique position that enables them to promote smoking cessation, as smokers are more aware of their health at... -
Tobacco and alcohol use among healthcare workers in three public hospitals in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: PI Okeke --- Department of Family Medicine, AJ Ross --- Department of Family Medicine, T Esterhuizen --- Programme of Biostatistics, Research Ethics and Medical Law, JM Van Wyk --- School of Undergraduate Medical Education, University of KwaZulu-Natal,Background: Tobacco use is a risk factor for most of the leading causes of death in the world. Healthcare workers (HCWs) can play an important role in assisting patients to stop smoking, but this role is undermined if they themselves... -
Lifestyle changes for hypertension
Item type: Journal Article • Journal: South African Family Practice • Authors: V Mungal-Singh --- Heart and Stroke Foundation South Africa, -
Prevalence, Correlates and Perceptions Towards Cigarette Smoking Among Male and Female in School Adolescents (Aged 11–18 Years) in South Africa: Results from the 2008 GYTS Study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- HAST, Human Sciences Research Council and Department of Psychology, South AfricaThe aim of this study was to estimate the prevalence and identify correlates of current cigarette use among 8,470 school-going adolescents (aged 11 to 18 years) in South Africa. A cross-sectional study was carried out in 2008 in South Africa... -
Factors associated with retreatment tuberculosis in Tshwane, south africa: the role of tobacco smoking
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: G M C Louwagie --- Public Health Medicine, School of Health Systems and Public Health, Faculty of Health Sciences, University of Pretoria, O A Ayo-Yusuf --- Dean/Director’s Office, School of Oral Health Sciences, Faculty of Health Sciences, University of Limpopo, Medunsa Campus Director, Southern Africa Resilient Africa Innovation Laboratory, Grant Recipient American Cancer Society,There is evidence from international studies that tobacco smoking increases the risk of tuberculosis recurrence through its effects on the immunological and barrier functions of the airways. In this cross-sectional study, the association between current tobacco smoking and retreatment tuberculosis... -
Correlates of illicit drug use among university students in Africa and the Caribbean
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- ASEAN Institute for Health Development, Mahidol University, Thailand Supa Pengpid --- ASEAN Institute for Health Development, Mahidol University, ThailandThe goal of this study was to estimate the prevalence and correlates of illicit drug use (IDU) among university students from eight countries in Africa and three countries in the Caribbean. In a cross-sectional survey, data were collected from 7... -
Correlates of tobacco use among tuberculosis patients in South Africa: A brief report
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- ASEAN Institute for Health Development, ThailandThis study examined tobacco use by tuberculosis (TB) patients through socio-health variables. The sample comprised 724 TB patients (mean age 37.1 years, SD = 11.3; males = 71.4%) receiving care from 40 primary health facilities across South Africa. They completed... -
Perceptions of students regarding the effects of the implementation of the tobacco control act of 1999 on a South African University campus
Item type: Journal Article • Journal: South African Family Practice • Authors: M.W. Khan --- Department of Basic Medical Sciences, South Africa V. Hira --- Department of Basic Medical Sciences, South Africa F. Haffejee --- Department of Basic Medical Sciences, South AfricaBackground: Smoking among adolescents is high. In order to curb the habit, restrictions on use of tobacco products in public places were implemented in South Africa. This study aimed to explore students’ perceptions of whether the implementation of smoking restrictions... -
Prevalence and factors associated with tobacco use among adults attending selected healthcare facilities in Buffalo City Metropolitan Municipality, South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: EO Owolabi --- Faculty of Health Sciences, Department of Nursing Science, South Africa DT Goon --- Faculty of Health Sciences, Department of Nursing Science, South Africa OV Adeniyi --- Faculty of Health Sciences, Department of Family Medicine, South Africa E Seekoe --- Faculty of Health Sciences, Department of Nursing Science, South Africa AO Adedokun --- Faculty of Health Sciences, Department of Nursing Science, South AfricaAim: Tobacco use increases the risk of cardiovascular disease, premature death and certain cancers. This study investigated the prevalence and determinants of tobacco use among adults in Buffalo City Metropolitan Municipality (BCMM), South Africa. -
Association between tobacco use, depression, and anxiety: A cross-national study among university students from 30 low- and middle-income countries
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- Department for Management of Science and Technology Development, Vietnam Supa Pengpid --- ASEAN Institute for Health Development, ThailandThis study aimed to investigate the association between tobacco use and depression and anxiety in a cross-national study among university students from 30 predominantly low- and middle-income countries. Self-report survey data were collected from 23 073 university students (58.0% female),... -
Concurrent alcohol and tobacco use among school-going adolescents in Namibia: Prevalence and risk factors
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- HIV/AIDS/STIs/and TB (HAST), South Africa Supa Pengpid --- Department of Research and Innovation, South AfricaThe aim of this study was to investigate the prevalence and risk factors for concurrent alcohol and tobacco use among school-going adolescents in Namibia. Data were from a sample of 4 531 Namibian middle school children (females = 53.1%; mean... -
Concurrent tobacco use and risky drinking in South Africa: Results from the South African National Health and Nutrition Examination Survey
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Nancy Phaswana-Mafuya --- Deputy Vice Chancellor Research and Innovation Office, South Africa Karl Peltzer --- Deputy Vice Chancellor Research and Innovation Office, South Africa Supa Pengpid --- ASEAN Institute for Health Development, ThailandThe aim of this study was to examine socio-demographic and psychosocial correlates of concurrent tobacco use and risky drinking. We analysed data from the cross-sectional South African National Health and Nutrition Examination Survey (SANHANES-1) 2011–2012. The sample included 14 764... -
Post-traumatic stress disorder and health risk behaviour among persons 15 years and older in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- HIV/AIDS/STIs and TB (HAST), Human Sciences Research Council, South Africa Supa Pengpid --- Department of Research Innovation and Development, South AfricaThe aim of this study was to investigate the association between post-traumatic stress disorder (PTSD) and health risk behaviours among persons 15 years and older in South Africa. We analysed data from the South African National Health and Nutrition Examination... -
Effects of tobacco use on non-adherence to antiretroviral therapy among HIV-positive patients in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Supa Pengpid --- ASEAN Institute for Health Development, Thailand Diana Huis in ‘t Veld --- Department of Internal Medicine and Infectious Diseases, Belgium Karl Peltzer --- Department for Management of Science and Technology Development, VietnamThis study aimed to estimate the relationship between tobacco use and non-adherence to antiretroviral therapy (ART) in a South African sample. Participants were 1 963 HIV patients who attended a primary care clinic in Pretoria (female = 68.5%; black African... -
Tobacco use and subjective well-being in university students from 29 countries: A brief report
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Supa Pengpid --- , Thailand Karl Peltzer --- , South AfricaThis cross-national study explored the relationship between tobacco use and subjective well-being indicators (e.g. life satisfaction, happiness, and perceived health status) in university students from 29 low-, middle- and high-income countries. Data were collected from 20 355 university students (median... -
Adolescent hookah pipe use: Comparing users’ and non-users’ harm perception, needs, and motivation
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Zainab Kader --- , South Africa Rik Crutzen --- , The Netherlands Nicolette V. Roman --- , South AfricaThis study compared the harm perception, motivation, and basic psychological needs of adolescent hookah pipe users and non-users. We surveyed 1 201 adolescents aged 13–19 years old from South Africa who were hookah users (n = 256) and non-users (n... -
‘Public enemy no. 1’: Tobacco industry funding for the AIDS response
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Julia Smith --- , , Canada Sheryl Thompson --- , , Canada Kelley Lee --- , , CanadaThis article analyzes the history of tobacco industry funding for the AIDS response – a largely ignored aspect of private donor involvement. Primary documents from the Legacy Tobacco Documents Library and AIDS organizations are analyzed, alongside existing literature on the... -
Heavy episodic alcohol use among adults: Prevalence and correlates in Central African Republic
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- University of the Free State, South AfricaHeavy episodic drinking (HED) is associated with negative health consequences. The goal of the study was to assess HED among the general adult population in Central African Republic (CAR). In a cross-sectional survey in CAR (Bangui city and Ombella M’Poko... -
Sociodemographic, mental, and physical health determinants of incident depressive symptoms among ageing men and women in rural South Africa: A longitudinal study from 2015 to 2022
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- University of the Free State, South AfricaWe aimed to assess the associations between sociodemographic, mental, and physical health factors and incident depressive symptoms (IDS) among ageing men and women in rural South Africa over time. Data from the 7-year South African longitudinal Health and Ageing in... -
Exploring the association of alcohol consumption, tobacco use, and multimorbidity in a nationally representative sample of South African adults
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: A Craig --- University of the Witwatersrand, South Africa W Mapanga --- University of the Witwatersrand, South Africa A Mtintsilana --- University of the Witwatersrand, South Africa SN Dlamini --- University of the Witwatersrand, South Africa SA Norris --- University of the Witwatersrand, South Africa
