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Timber Harvesting in South Africa—Past, Present, Future
Item type: Journal Article • Journal: South African Forestry Journal • Authors: P.W. Warkotsch --- Faculty of Forestry,After a short description of South African timber harvesting practices in the past, the present situation in terms of machine population and the current harvesting and extraction methods is discussed in more detail. -
Cable Yarding in Southern Africa: An Analysis of its Productivity and Possible Procedure for its Improvement
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.M. de Laborde --- Institute for Commercial Forestry Research, South AfricaThe demand for timber in southern Africa is increasing and this is resulting in the afforestation of areas which require cable yarding when harvested. The demand for cable yarders, essentially fixed skylines, is therefore increasing rapidly. Stress is being placed... -
The Impact of Harvesting Operations on Timber Quality: Causes and Remedies
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Walter Warkotsch --- Forest Engineering Technology, Faculty of Forestry,Forests are devastated daily to satisfy the world's timber demands. Tropical forests throughout the world are exploited and endangered. An obligation therefore exists to avoid damage to timber and minimise waste wherever possible. -
Patterns of selection of Acacia karroo by goats and changes in tannin levels and in vitro digestibility following defoliation
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- , Republic of South AfricaPatterns of browse selection by Boer goats in a representative Acacia karroo community in the eastern Cape were studied. The rate of intake of browse was positively related to the leaf mass per unit length of the shoot. The ease... -
Some observations on rodent and antelope damage in commercial forest plantations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.S. Eccles --- , Republic of South Africa K.M. Little --- , Republic of South AfricaThe impact of various weeding and site-preparation treatments on Acacia mearnsii and Pinus patula damage by mammalian pests was assessed. Browsing by small antelope on Acacia mearnsii was significantly less in areas where harvesting residues had been retained rather than... -
The development of harvesting schedules and post-harvesting management practices relative to oil yield of Eriocephalus punctulatus
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.N. Webber --- Department of Livestock and Pasture Science, Republic of South Africa M.L. Magwa --- Electron Microscope Unit, J. van Staden --- Department of Botany, University of Natal Pietermaritzburg, Republic of South AfricaThe first phase in the domestication programme of Eriocephalus punctulatus involved establishing how this crop could be harvested without adversely affecting plant vigour and longevity. The second phase of the domestication programme was the development of harvesting schedules that would... -
Effect of planting and harvesting dates on fungus-growing termite infestations in maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. van den Berg --- , South Africa H.F. Riekert --- , South AfricaFungus-growing termites (Microtermes spp. and Allodontermes spp.) damage maize roots and cause lodging. The pattern of attack, incidence of lodging, and the effect of planting and harvesting dates on damage and yield were studied in field trials over five seasons... -
Amaranthus tricolor L. leaf yields affected by salinity, harvesting stage and harvesting methods
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. E.M.M. Ribeiro --- Department of Agronomy, South Africa N. J.J. Combrink --- Department of Agronomy, South AfricaSingle Amaranthus tricolor seedlings were transplanted into containers filled with 5 I river sand and were fertigated with a ‘drain to waste’ system. Plants were grown in the open under warm summer conditions. Four to six daily applications of nutrient... -
Evaluating the maize production potential of a semi-arid ecotope with four production techniques
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.B. Zere --- Department of Soil, South Africa C.W. Huyssteen --- Department of Soil, South Africa M. Hensley --- Department of Soil, South AfricaWater conservation production techniques are needed to boost crop production in semi-arid areas. The in-field rainwater harvesting (IRWH) technique has been developed for this purpose, and found to be successful on clay and duplex soils, but has not yet been... -
Soil compaction under sugar cane (Saccharum hybrid sp.) cropping and mechanization in Mauritius
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.R. Ng Cheong --- , Mauritius K.F. Ng Kee Kwong --- , Mauritius C.C. Du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaFarm machinery is increasingly used in sugar cane production in Mauritius and is expected to cause soil compaction. A study was undertaken to ascertain whether the five major cane-growing soil groups of Mauritius were being compacted as a result of... -
Advances in soil physics: Application in irrigation and dryland crop production
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.D. van Rensburg --- Department of Soil, Crop and Climate Sciences, South AfricaThis is the third soil physics review to be published in South African Journal of Plant and Soil. In the previous reviews the focus was broad and covered almost every aspect of the subject, providing a comprehensive list of contributions... -
The effects of kelp harvesting on its regrowth and the understorey benthic community at Danger Point, South Africa, and a new method of harvesting kelp fronds
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: G. J. Levitt R. J. Anderson C. J. T. Boothroyd F. A. KempAt Danger Point, South Africa, mariculture of the abalone Haliotis midae has led to increased demand for freshly harvested kelp Ecklonia maxima. This study estimates the biomass of E. maxima available for harvesting, investigates the effects of harvesting on the... -
THE ZOOBENTHOS OF THE TOUW RIVER FLOODPLAIN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. DAVIES --- Institute for Freshwater Studies, Republic of South AfricaAn eighteen month study (January 1979 - June 1980) of the sediment, emergent and submerged plant-associated benthic macro-invertebrates of the western sector of the Touw River Flood-plain is reported for four study sites: Wilderness Lagoon, the Touw River and East... -
The effect of harvesting operations, slash management and fertilisation on the growth of a Eucalyptus clonal hybrid on a sandy soil in Zululand, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: ColinW Smith Ben du ToitHarvesting operations during clearfelling and extraction of timber from commercial plantations result in many processes that may affect long-term site productivity such as soil compaction and residue manipulation. The objective of this work was to evaluate the effects of various... -
Production speed effects on log-making error rates and value recovery for a mechanized processing operation in radiata pine in New Zealand
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: G.E. Murphy H.D. Marshall A.W. EvansonMechanized processing operations are complex "man-machine" systems. The impacts of changes to work practices are, therefore, dependent on the effects the changes have on both the machine and the man. A mechanized processor, delimbing and cutting tree length stems into... -
Age determination of miombo species Brachystegia spiciformis (Leguminosae – Caesalpinoideae) in Zimbabwe using growth rings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: I.M. GrundyThe objective of this study was to determine whether Brachystegia spiciformis Benth. (Leguminosae – Caesalpinoideae), one of the dominants of dry miombo woodland in Zimbabwe, forms annual growth rings. In the past the production of effective cutting rotations and sound... -
Fish as a resource in a rural river catchment in the Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BCW van der WaalThe rural population in the Mutshindudi River valley, in the north-eastern corner of the Northern Province, accept locally-caught freshwater fish as food (85%), but tinned pilchards are the most commonly eaten fish. Fishing gear was recorded in 70% of the... -
Productivity Studies of a Large Scale Semi-mechanised Harvesting System for Shortwood in Hilly Terrain
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.M. de Laborde --- ,Large scale extraction of shortwood E. grandis timber by means of a semi-mechanised system in hilly terrain gives high productivity from clearfellings. The system employs wheeled tractors and manually loaded low-bed trailers for infield shortwood harvesting. Loads of five to... -
Harvesting of Pine and Eucalypt in South Africa
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Walter Warkotsch --- Faculty of Forestry,South Africa's geography, the forest resources and typical management practices are discussed. Most recent supply and demand prognosis data are cited to demonstrate the rapid growth rates and to indicate the growing importance of well designed and balanced harvesting operations. -
Could phosphorus concentrations increase with the development of cage culture in Lake Kariba, Zimbabwe?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- Department of Biological Sciences, Zimbabwe W Mhlanga --- Department of Environmental Science, Zimbabwe P Mwera --- Lake Harvest, Zimbabwe P Tendaupenyu --- Department of Biological Sciences, ZimbabweA comparison between historical and current data was done to determine whether the concentrations of total phosphorus, orthophosphate and chlorophyll a, and Secchi disc transparency, have changed in the Sanyati Basin of Lake Kariba following the commencement of cage culture... -
A simple method for rapid estimation of Ecklonia maxima and Laminaria pallida biomass using floating surface quadrats
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Rothman --- Department of Agriculture, South Africa RJ Anderson --- Department of Agriculture, South Africa JJ Bolton --- Department of Botany, South Africa CJT Boothroyd --- Department of Agriculture, South Africa FA Kemp --- Department of Agriculture, South AfricaIn South Africa two species of kelp, Ecklonia maxima and Laminaria pallida, occur in quantities sufficient for commercial use. Currently, the former species is harvested in large quantities (about 5 000 tonnes wet weight per year) as abalone feed. In... -
A framework for analyzing workforce dynamics in forest harvesting in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Killian Tendai Manyuchi --- Forest Engineering: Department of Forestry Sciences, South Africa ReinoE. Pulkki --- Forest Engineering: Department of Forestry Sciences, South Africa R.P.F --- Faculty of Forestry and the Forest Environment, CanadaPeople are the industry's most valuable asset. However, due to its dynamic nature, labour cannot be owned but only rented. A framework for measuring, monitoring and managing labour dynamics is used and tested in forest harvesting operations in South Africa... -
Socio-economic impact of ox skidding project to the surrounding villages of Mount Meru forest plantations, Northern Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: W.S. Abeli --- Faculty of Forestry and Nature Conservation, Tanzania J.R. Maximillian --- Faculty of Forestry and Nature Conservation, Tanzania A.E. Kweka --- Faculty of Forestry and Nature Conservation, Tanzania D.T.K. Shemwetta --- Faculty of Forestry and Nature Conservation, TanzaniaThe ox skidding project was initiated with the objective ofusing oxen for transporting logs from the stump sites to the landings. It was supposed to be a participatory research project aimed at integrating scientific knowledge with practical skills and resource... -
Effects of site management operations on the nutrient capital of a eucalypt plantation system in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Ben du Toit --- , South AfricaThe Karklo of Project is a case study ofthe effects ofintensive site management operations during the interrotational period, on (a) the nutrient capital of the system, and (b) the availability of growth resources (nutrients and water) in a commercial Eucalyptus... -
Does soil compaction on harvesting extraction roads affect long-term productivity of Eucalyptus plantations in Zululand, South Africa?
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Colin W. Smith --- ,The effect ofsoil compaction on the growth of Eucalyptusgrandis and two clonal hybrids (Eucalyptus grandis x urophylla (E. gxu) and Eucalyptus grandis x camaldulensis (E. gxc)) was evaluated on harvesting extraction roads at three sites in the Zululand region ofKwaZulu-Natal... -
Survival and growth of Pinus patula at two years in response to harvest residue and pest management, in Mpumalanga, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Carol Rolando --- , Ross Allan --- ,Previous research has indicated that the presence of harvesting residues, post-planting tern perature and rainfall, and insect pests and diseases, are among the main causes of mortality during re-establishment of Pinus patula stands. The main objectives of this work were... -
Effects of temperature on Pinus patula seedlings growing in pots in a controlled environment
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Colleen A. Carlson --- Horticultural Science Department, South Africa Ross Allan --- Shaw Research Centre, South Africa Andrew R. Morris --- Shaw Research Centre, South AfricaThe re-establishment of Pinus patula seedlings into sites with high harvesting residue (slash) loads can negatively affect the survival of these plants. Field trials have examined the role that insect pests and fungal diseases play in causing this phenomenon. Research... -
Harvesting, processing and utilisation of rattan canes in Western Nigeria
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E. Babajide Lucas --- Department of Agricultural Engineering, Nigeria Bamidele I.O. Dahunsi --- Department of Civil Engineering, NigeriaField trips were undertaken as a preliminary exercise, to identify the available rattan species in Western Nigeria and to estimate the quantities available. Information relating to their end-uses was collected from cane furniture makers and other rattan cane users through... -
Oil yield and quality variation between sexes in Osyris lanceolata (African sandalwood) and its value as a fodder plant in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: PL Mwang’ingo --- Faculty of Science, Tanzania G Kibodya --- Faculty of Science, Tanzania AR Mng’ong’o --- , TanzaniaAfrican sandalwood (Osyris lanceolata) is widely harvested in East Africa for extraction of oil, which is used in the fragrance and perfumery industry. Over the years, harvesting of the species has been concentrated to female plants because it is claimed... -
Fibre volume losses of eight softwood clearfell harvesting systems in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: P Ackerman --- Department of Forest and Wood Science, South Africa R Pulkki --- Department of Forest and Wood Science, South AfricaA study of both fibre volume loss and related opportunity cost was performed across the South African softwood sawtimber industry to gain information on the actual utilisation of useful fibre and potential loss or gain of opportunity in terms of... -
Response of Ocotea bullata, Curtisia dentata and Rapanea melanophloeos to medicinal bark stripping in the southern Cape, South Africa: implications for sustainable use
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: WJ Vermeulen --- Conservation Services, South Africa CJ Geldenhuys --- Department of Forest and Wood Science, South Africa KJ Esler --- Department of Conservation Ecology, South AfricaTree bark is commonly used for traditional medicine in southern Africa and further afield. Increasing demand and commercialisation have resulted in the overexploitation of many species, posing a major challenge to forest managers to develop mechanisms for sustainable resource use... -
Machine productivity and residual harvesting residues associated with a cut-to-length harvest system in southern Tasmania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MR Ghaffariyan --- , Australia J Sessions --- Department of Forest Engineering, Resources and Management, USA M Brown --- Office of PVC Research, AustraliaThe cut-to-length method is a preferred method for harvest of pine plantations in Australia. The cut-to-length method studied in southern Tasmania consists of a feller-buncher, processor, forwarder, grapple loader and tractortrailers that were producing only pulp logs for the plantation... -
Mangrove litter production and organic carbon pools in the Mngazana Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Anusha Rajkaran JanineB AdamsWood harvesting is reducing the density of adult mangrove trees in the Mngazana Estuary. This is expected to decrease the amount of litter produced as well as the availability of organic carbon to the estuary and the nearshore environment. Pools... -
Juncus kraussii harvesting in Umlalazi Nature Reserve, KwaZulu-Natal, South Africa: socio-economic aspects and sustainability
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CatherineH TraynorHarvesting of the rush Juncus kraussii Hochst. for use as a fibre source in craftwork production was investigated within Umlalazi Nature Reserve in KwaZulu-Natal Province, South Africa. The main objectives of the study were as follows: to determine the distribution... -
Toward sustainable harvesting of Africa's largest medicinal plant export (Prunus africana): a case study in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JR Maximillian --- College of Natural Resources, USA J O'Laughlin --- College of Natural Resources, USAGlobal demand for treating prostate disorders with Prunus africana bark extract has made P. africana Africa's largest medicinal plant export. Unsustainable harvesting practices can lead to local extirpations of this multipurpose tree. Survey research targeting P. africana harvesters in a... -
Productivity and cost analysis of semi-mechanised and mechanised systems on the Viphya forest plantations in Malawi
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Elisha Ngulube --- Forest Postgraduate Programme, Plant Sciences Complex, South Africa Michal Brink --- Forest Postgraduate Programme, Plant Sciences Complex, South Africa Paxie W Chirwa --- Forest Postgraduate Programme, Plant Sciences Complex, South AfricaAt least 200 000 m3 of timber is harvested annually using semi-mechanised harvesting systems on the Viphya forest plantations in Malawi. Although these systems have long been used on the Viphya, no investigation on their productivity has so far been... -
Marine reserve effects on population density and size structure of commonly and rarely exploited limpets in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MDV Nakin --- Walter Sisulu University, South Africa CD McQuaid --- Coastal Research Group, Department of Zoology and Entomology, South AfricaMarine reserves are commonly used to conserve living resources, but their effectiveness where policing is difficult is unclear. We compared monthly population density and size structure data collected over 20 months for two rarely and two commonly exploited intertidal limpets... -
Clinical anatomy of the superior cluneal nerve in relation to easily identifiable bony landmarks
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: L Loubser --- Department of Anatomy, South Africa RP Raath --- Jakaranda Pain Clinic, South Africa AN Van Schoor --- Department of Anatomy, South AfricaBackground: Lower back pain (LBP) remains a common ailment among adult populations and a superior cluneal nerve (SCN) entrapment accounts for 10% of reported LBP cases. The diagnostic criteria for SCN entrapment include anaesthesia of the area supplied by the... -
Bald kelp: natural and harvesting-induced frond loss in the South African kelp Ecklonia maxima
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Elston --- Department of Biological Sciences, South Africa RJ Anderson --- Department of Biological Sciences, South Africa LM Price --- Department of Biological Sciences, South AfricaEcklonia maxima dominates kelp beds on the west coast of southern Africa, and is commercially and ecologically valuable. Some plants lose all their secondary blades (fronds), leaving only the gas-filled bulb and short primary blade at the top of the... -
Integrated harvesting for conventional log and energy wood assortments: a case study in a pine plantation in Western Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Mohammad R Ghaffariyan --- Australian Forest Operations Research Alliance (AFORA), University of the Sunshine Coast, Australia Raffaele Spinelli --- CNR-IVALSA, Italy Natascia Magagnotti --- CNR-IVALSA, Italy Mark Brown --- Australian Forest Operations Research Alliance (AFORA), University of the Sunshine Coast, AustraliaBiomass or energy wood harvesting can be integrated with conventional log harvesting (saw log or pulpwood production) to allow more cost-effective energy wood supply. The efficiency of an integrated energy wood harvesting system was evaluated and compared with conventional log... -
Operator work-related musculoskeletal disorders during forwarding operations in South Africa: an ergonomic assessment
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kudakwashe Phairah --- Department of Plant Production and Soil Science, Forest Science Postgraduate Programme, South Africa Michal Brink --- Department of Plant Production and Soil Science, Forest Science Postgraduate Programme, South Africa Paxie Chirwa --- Department of Plant Production and Soil Science, Forest Science Postgraduate Programme, South Africa Andrew Todd --- Department of Human Kinetics and Ergonomics, South AfricaForest machine operators are still experiencing work-related musculoskeletal disorders (WMSDs) despite extensive mechanisation and modernisation of harvesting systems. However, paucity of local ergonomics research and technology transfer problems may affect the use of mechanised systems in South Africa. Consequently, this... -
Decision-support tool for management of miombo woodlands: a matrix model approach
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Wilson A Mugasha --- Department of Ecology and Natural Resource Management, Norway Ole M Bollandsås --- Department of Ecology and Natural Resource Management, Norway Terje Gobakken --- Department of Ecology and Natural Resource Management, Norway Eliakimu Zahabu --- Department of Forest Mensuration and Management, Tanzania Josiah Z Katani --- Department of Forest Mensuration and Management, Tanzania Tron Eid --- Department of Ecology and Natural Resource Management, NorwayRational forest management planning requires information on the present forest state and on future development. However, forest management planning in Tanzania has often been done without any information on forest development because appropriate tools are lacking. This study presents a... -
Bark removal for medicinal use predisposes indigenous forest trees to wood degradation in Zambia
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: D Chungu A Muimba-Kankolongo J Roux FM MalamboBark harvesting for medicinal purposes has become widespread in Zambia, mainly due to the high levels of poverty among the population. The injury caused to trees leads to wood deterioration as a result of insect damage and fungal infection. This... -
Phylogeny of the Sepia officinalis species complex in the eastern Atlantic extends the known distribution of Sepia vermiculata across the Benguela upwelling region
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJE Healey --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales NJ McKeown --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales WM Potts --- Department of Ichthyology and Fisheries Science, South Africa CL de Beer --- Department of Ichthyology and Fisheries Science, South Africa W Sauer --- Department of Ichthyology and Fisheries Science, South Africa PW Shaw --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, WalesAccurate species identification and biogeographic characterisation are fundamental for appropriate management of expanding cephalopod fisheries. This study addresses this topic within the common cuttlefish Sepia officinalis species complex (S. officinalis, S. hierredda and S. vermiculata), with an emphasis on occurrence... -
Harvesting and extraction impacts on Eucalyptus grandis × E. urophylla coppicing potential and rotation-end volume in Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kylle Schwegman --- Nelson Mandela Metropolitan University, South Africa Keith M Little --- Nelson Mandela Metropolitan University, South Africa Andrew McEwan --- Nelson Mandela Metropolitan University, South Africa Simon A Ackerman --- Institute for Commercial Forestry Research, South AfricaFrom the early 2000s there has been a general shift in South Africa in harvesting and extraction systems from the use of semi- to fully-mechanised systems. Any increase in mechanisation, as is occurring in Zululand, will need to take into... -
Impact of number of stems per stool on mechanical harvesting of a Eucalyptus globulus coppiced plantation in south-west Western Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Martin Strandgard --- Australian Forest Operations Research Alliance (AFORA), Australia Rick Mitchell --- Australian Forest Operations Research Alliance (AFORA), AustraliaCoppice regeneration of eucalypt plantations is increasingly being used in Australia to reduce re-establishment costs. However, little is known about the impact of early coppice reduction regimes on harvester performance during clearfelling. The trial compared the productivity, time consumption, cost... -
A productivity model for first thinning of Pinus patula using a tractor and double-drum winch in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Thabo Moloi --- Forest Postgraduate Programme, South Africa Michal Brink --- Forest Postgraduate Programme, South Africa Paxie W Chirwa --- Forest Postgraduate Programme, South Africa Elisha Ngulube --- Department of Forestry, MalawiThe productivity of skidding tractors in intermediate harvesting operations has not been determined in Mpumalanga, South Africa. The objective of this study was to develop a productivity model using a farm tractor in first thinning operations in Pinus patula compartments... -
Performance of Drought Tolerant Maize Varieties under Water Harvesting Technologies in the Coastal Region of Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: M.B. Muli --- Kenya Agricultural and Livestock Research Organization, Kenya D. Kengo --- Kenya Agricultural and Livestock Research Organization, Kenya A. Mzingirwa --- Kenya Agricultural and Livestock Research Organization, Kenya R. Musila --- Kenya Agricultural and Livestock Research Organization, KenyaThe average annual rainfall in coastal Kenya is 450–700 mm per annum in most places while the total annual evapotranspiration is 1200–1800 mm. In arid and semi-arid lands (ASALs), farmers grow maize varieties for medium to high rainfall zones without considering the... -
Assessment of consumer preference traits of indigenous sheep type and market channels in Bensa District, Southern Ethiopia
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: H Kenfo --- Southern Agricultural Research Institute, Ethiopia Y Mekasha --- International Livestock Research Institute, Ethiopia Y Tadesse --- Haramaya University, EthiopiaThis study was carried out in Bensa district of Sidama Zone, southern Ethiopia. The objective of this study was to assess consumer preference traits of indigenous sheep type in the study area. Data were analysed using SPSS versions 16. There... -
Impact of land use on woody aboveground biomass in Miombo woodlands of western Zambia – comparison of three allometric equations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Priscilla Sichone --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Ute Schmiedel --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Jens Oldeland --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Norbert Jürgens --- Institute for Plant Science and Microbiology, University of Hamburg, GermanyGlobally, the intensification of land use for agriculture, timber and fuel is considered the leading threat to the diversity and biomass of forests and woodlands. To suggest management options, it is important to understand the patterns and drivers of diversity,... -
Promoting rainwater harvesting for improving water security: Analysis of drivers and barriers in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mavis Akuffobea-Essilfie --- , Ghana Portia Adade Williams --- , Ghana Roland Asare --- , Ghana Sigrid Damman --- , Norway George Owusu Essegbey --- , GhanaThe study explored strategies and means of achieving wider acceptability and adoption of roof rainwater harvesting (RWH) systems in Ghana to improve water security and availability. The paper employed a qualitative approach in analyzing views expressed by a wide range... -
Rural community use and perception of rangeland products in Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Lwandiso Mdiya --- , South Africa Amon Taruvinga --- , South Africa Abbyssinia Mushunje --- , South Africa Keletso Mopipi --- , South Africa Saul Ngarava --- , South AfricaThe significance of rangelands to the welfare of the rural poor has been acknowledged. The study explores perceptions and determinants of rural households’ rangeland harvesting. A cross-sectional survey of 159 rural households harvesting communal rangeland products was utilized, as well... -
Machine learning techniques to estimate mechanised forest cutting productivity
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Saulo Boldrini Gonçalves --- , Brazil Nilton Cesar Fiedler --- , Brazil Jeferson Pereira Martins Silva --- , Brazil Gilson Fernandes da Silva --- , Brazil Mayra Luiza Marques da Silva --- , Brazil Luciano José Minette --- , Brazil Daniel Pena Pereira --- , Brazil Domingos Manuel Mendes Lopes --- , Portugal Evandro Ferreira da Silva --- , Brazil Antônio Henrique Cordeiro Ramalho --- , Brazil Jeangelis Silva Santos --- , Brazil Marcelo Otone Aguiar --- , Brazil Jose de Oliveira Melo Neto --- , Brazil Renisson Neponuceno de Araújo Filho --- , BrazilThe productivity of wood harvesting operations is one of the main viability indicators of the forestry enterprise, which is directly influenced by land, population, and operational planning characteristics. The variables that affect the productivity of harvesting machines are particularly difficult... -
Wood extraction performance with a farm tractor in a mountainous region of Brazil: cycle time, productivity and costs of two different work crews
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rafael Oliveira Brown --- , Brazil Kauê Augusto Oliveira-Nascimento --- , Brazil Renato César Gonçalves Robert --- , Brazil Daniel DeArmond --- , BrazilHarvesting is a complex and expensive step within forestry operations. In mountainous terrain timber harvesting is complex due to the risks and limitations that the terrain imposes on traditional forms of wood extraction. The objective of this study was to... -
Farmers’ knowledge, attitudes, and perceptions for the adoption of in-field rainwater harvesting (IRWH) technique in Thaba Nchu, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Admire Rukudzo Dzvene --- , South Africa Weldemichael Tesfuhuney --- , South Africa Sue Walker --- , South Africa Andries Fourie --- , South Africa Cobus Botha --- , South Africa Gert Ceronio --- , South AfricaA systematic engagement strategy was used to identify contextual factors that prevent farmers from accepting the in-field rainwater harvesting (IRWH) technique. The purpose of the qualitative study is to assess farmers’ knowledge and attitudes about the technique, as well as... -
Forage yield and quality response of Napier grass (Cenchrus purpureus) to different dry season harvesting management under the subhumid agroecology of western Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Abuye Tulu --- Oromia Agricultural Research Institute, Ethiopia Mekonnen Diribsa --- Oromia Agricultural Research Institute, Ethiopia Worku Temesgen --- Oromia Agricultural Research Institute, EthiopiaA 3 × 2 factorial study was conducted in 2015, 2016 and 2017, to assess the impact of dry season cutting management on fodder yield and quality of Napier grass. Three harvesting times (November, January and March) and two stubble-... -
Rainfed-based production of Megathyrsus maximus in sub-Saharan Africa: the case of the semi-arid environment of Sudan
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hussein I Mohamed --- , Sudan Shamseddin M Ahmed --- Water Management and Irrigation Institute, University of Gezira, Sudan Adil D Mohamed --- Water Management and Irrigation Institute, University of Gezira, SudanThe performance of rainfed-based Megathyrsus maximus (syn. Urochloa maxima and Panicum maximum) was investigated in the semi-arid pastures of Sudan. Split-plot complete design experiments with three replications were applied for two consecutive seasons (2020–2021). The treatments were two in situ... -
Effect of rotational harvesting on the size composition of Cape rock oysters Striostrea margaritacea on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn --- Oceanographic Research Institute, South Africa JC Groeneveld --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fishery Science, Uit – The Arctic University of Norway, NorwayA commercial fishery for the Cape rock oyster Striostrea margaritacea along the north coast of KwaZulu-Natal, South Africa (western Indian Ocean), follows a 4-year rotational cycle, with each harvest year followed by 3 fallow years across four harvest zones. We... -
Effect of plant spacing and cutting intensity on the morphology and productivity of forage cactus [Opuntia stricta (Haw.) Haw.]
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Claudia Maciel Ferreira --- Universidade Federal Rural de Pernambuco, Brazil Marcio Vieira da Cunha --- Universidade Federal Rural de Pernambuco, Brazil Mércia Virginia Ferreira dos Santos --- Universidade Federal Rural de Pernambuco, Brazil Alexandre Carneiro Leão de Mello --- Universidade Federal Rural de Pernambuco, Brazil Djalma Cordeiro dos Santos --- Instituto Agronômico de Pernambuco, Brazil Maria da Conceição Silva --- Instituto Agronômico de Pernambuco, Brazil Janerson José Coelho --- Universidade Federal Rural de Pernambuco, BrazilThe forage cactus cultivar Mexican elephant ear (MEE) [Opuntia stricta (Haw.) Haw.] has been widely used in the semi-arid of Brazil because of its resistance to carmine mealybug. Therefore, it is necessary to establish planting and harvesting management strategies for... -
Eunicid polychaete worms used as bait with particular reference to Australia, South Africa and France; the need for development of management plans based on their biology and ecology
Item type: Journal Article • Journal: African Zoology • Authors: Pat Hutchings --- Australian Museum Research Institute, Australia Jyothi Kara --- , South Africa Nicolas Lavesque --- CNRS, Université de Bordeaux, Bordeaux INP, EPOC,Worldwide, bait worms are collected for recreational and subsistence fishing, and fetch high prices in bait shops. While a variety of polychaete families are collected, we focus only on the “Marphysa” group (Family Eunicidae) occurring in rivers, estuaries and protected...