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The Application of Inorganic Fertilisers to Conditioned Pinus radiata Prior to Lifting as a Means of Improving Root Growth Capacity
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D. G.M. Donald --- ,A modified root growth capacity technique was used to evaluate the effect of the application of different types and quantities of fertilisers on the root growth capacity (RGC) of conditioned Pinus radiata seedlings. The experiment indicates that 0,05 g N... -
Regeneration Procedures of Pinus radiata in the Southern Cape Province
Item type: Journal Article • Journal: South African Forestry Journal • Authors: J.B. Zwolinski --- , D. G.M. Donald --- Forestry Faculty, A. van Laar --- Forestry Faculty,Part 4 of the series of papers concerning the regeneration of Pinus radiata deals with characteristics of the planting stock. Such studies are motivated by the necessity of evaluating different planting stock alternatives for a variety of operational environments. This... -
The Effect of Site Preparation and Tending on the Growth of Pinus radiata in the Southern Cape: Five Year Results
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Lee Cunningham --- ,This paper details the latest results of site preparation and tending experiments in Pinus radiata on regenerated sites, on both Kruisfontein Plantation in the Southern Cape District of the Western Cape Forest Region and Blueliliesbush Plantation in the Tsitsikamma Forest... -
Theaflavin values of various tea clones and selections grown in the northern Transvaal
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.J. van Lelyveld --- , Republic of South Africa K. de Rooster --- , Republic of South Africa B.L. Smith --- , Republic of South AfricaDifferent grades of black tea of several clones and selections from a tea estate in the northern Transvaal were tested for theaflavin (TF) content. In the pekoe dust (PD) grade there were no significant differences in TF values. In the... -
Phytotoxicity of pre-emergence herbicides to peach seedlings (Prunus persica)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.F. Lourens --- , Republic of South Africa A.H. Lange --- Extension Weed Scientist, United States of America F.J. Calitz --- , Republic of South AfricaPre-emergence herbicides were tested for relative phytotoxicity to Nemaguard peach seedlings (Prunus persica) in a sand culture. Typical symptoms, phytotoxicity ratings, growth and regrowth parameters were recorded. Diuron, the mixture diuron plus terbacil (1:1), terbutryne and norflurazon were rated phytotoxic... -
Effect of temperature on the severity of pre-and post-emergence damping-off and seedling blight of grain sorghum (Sorghum bicolor)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.W. McLaren --- , Republic of South Africa F. H.J. Rijkenberg --- Department of Microbiology and Plant Pathology, Republic of South AfricaThe effect of temperature regimes on seedling diseases of grain sorghum (Sorghum bicolor (L.) Moench), was investigated in growth cabinets and for five planting dates in field trials. The period from planting to seedling emergence was increased by low pre-emergence... -
The inheritance of drought resistance characteristics in grain sorghum seedlings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.G. Wenzel --- , Republic of South AfricaA factorial crossing method was used to study the inheritance of and the relationship between characteristics which are related to drought resistance in grain sorghum seedlings. The potential for improving drought resistance in grain sorghum seedlings was verified by the... -
Effect of sugary disease exudates on germination, seedling development and predisposition to seedling diseases of sorghum (Sorghum bicolor)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.W. McLaren --- Summer Grain Centre, Republic of South AfricaSorghum harvested for seed from Claviceps africana-infected fields becomes coated with sugary disease exudates in which the fungal spores are borne. The role of exudates in the inhibition of seed germination, seedling growth and predisposition to seedling diseases was investigated... -
The inheritance of seedling growth rate in grain sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.G. Wenzel --- , Republic of South AfricaThe inheritance of growth rate in grain sorghum seedlings was studied in two factorial crossing systems. The presence of both additive and dominance genetic variation was indicated. The additive gene effects played a greater role. At least three genetic factors... -
Ecological factors affecting the early development of seedlings of three Acacia species from Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F. Sánchez-Bayo --- Department of Wool and Animal Science, Australia G.W. King --- Department of Wool and Animal Science, AustraliaThree Acacia species from Ethiopia, namely Acacia nubica, A. seyal and A. horrida, were tested for growth and resistance to drought during the establishment phase in glasshouse and laboratory conditions. The experiments showed that each species has different preferences for... -
Effects of aqueous extracts from Artemisia afra parts and soil on seed germination and early seedling development in selected plant species
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. Hansen-Quartey --- Department of Agronomy, Republic of South Africa K. Nyamapfene --- , Republic of South Africa S.A. Materechera --- School of Agriculture, Republic of South AfricaAqueous extracts from leaves, stems, roots of the aromatic shrub Artemisia afra and soil on which Artemisia was grown, were used to investigate their inhibitory effects on germination and seedling development of maize (Zea mays), bean (Phaseolus vulgaris) and ryegrass... -
Suitability of two types of plastic covering on mini-tunnels for paprika seedling production in warm areas
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Allemann --- , Republic of South Africa J. Viljoen --- , Republic of South Africa J.G. Niederwieser --- , Republic of South AfricaA trial was conducted at the ARC-Roodeplaat Vegetable and Ornamental Plant Institute to determine the difference between the two types of plastic (clear and opaque) used as covering for mini-tunnels during paprika (Capsicum anuum L.) seedling production. Two cultivars (PapriKing... -
Effect of soil nutrient status on severity of seedling diseases and root rot of sorghum (Sorghum bicolor)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.W. McLaren --- , Republic of South AfricaThe hybrid NK283 was subjected to a range of nutrient element concentrations to determine their effect on predisposition of sorghum to seedling diseases and root rot. Emergence was not affected by soil nutrient status. Similarly N, P and K did... -
Effect of chemical seed treatment on the germination and seedling vigour of canola (Brassica napus var. oleifera)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. de Villiers --- Department of Agronomy, South Africa G.A. Agenbag --- Department of Agronomy, South Africa S.C. Lamprecht --- , South AfricaIncubation studies were conducted to determine effects of two chemical seed treatments (Cruiser & SA-combination) on the germination and seedling vigour of canola (cv. Varola 44) seed. Germination percentages of the Cruiser and SA-combination treated seeds were not significantly reduced... -
Effect of chemical seed treatment on the germination and seedling growth of canola under different soil conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. De Villiers --- Department of Agronomy, South Africa S.C. Lamprecht --- , South Africa G.A. Agenbag --- Department of Agronomy, South AfricaStudies in a temperature controlled greenhouse were conducted to determine if phytotoxic effects of chemical seed treatments found in incubation studies also have an effect on the germination- and seedling vigour of canola (cv Varola 44) seed planted in simulated... -
Bio-stimulatory properties in seeds of plants from the families Caryophyllaceae and Fabaceae with application potential in agriculture
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Pretorius --- , South Africa A. Du Plessis --- , South Africa E. van der Watt --- , South AfricaA comparative investigation into the bio-stimulatory activity of seed suspensions from two South African plant species belonging to each of the families Caryophyllaceae and Fabaceae were conducted using ComCat®, a commercially available bio-stimulant, as a positive control. These included Acacia... -
Control of black wattle (Acacia mearnsii De Wild.) seedlings with Garlon herbicide applied by backpack mistblower
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.D. Viljoen --- , South Africa C.W. Stoltsz --- , South AfricaBlack wattle (Acacia mearnsii De Wild) has great economic value for South Africa, but also poses a tremendous threat to our natural ecosystems once it “escapes” from plantations into the surrounding grassland and watercourses, often forming dense, impenetrable thickets that... -
Effect of pine bark goat manure medium on seedling growth and N, P, K concentration of various vegetables
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.T. Mupondi --- Department of Agronomy, Faculty of Science and Agriculture, South Africa P.N.S. Mnkeni --- Department of Agronomy, Faculty of Science and Agriculture, South Africa P. Muchaonyerwa --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaPine bark compost is the medium of choice for seedling growers in South Africa due to its availability, low cost and good physical properties. However, it is acidic, has low electrical conductivity (EC) and nutrient content such that fortification and... -
Response of local mustard germplasm to water stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.P. Mbatha --- , A.T. Modi --- ,A preliminary study was conducted to compare three wild mustard (Brassica species) landraces with respect to germination capacity and seedling emergence under two water regimes. Seeds of three landraces [Isaha, Masihlal-isane (both Brassica juncea (L.) Czern & Coss) and Kway-imba... -
Soil seed bank evaluation and seedling establishment along a degradation gradient in a semi-arid rangeland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: HA SnymanThe effects of rangeland degradation on the size and species composition of the seed bank and seedling establishment in the field were quantified over a two year period (2000–2001 and 2001–2002 growing seasons). Soil seed bank sampling was carried out... -
Variable community responses to herbivory in fire-altered landscapes of northern Patagonia, Argentina
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T Kitzberger E Raffaele T VeblenLandscapes in northern Patagonia have undergone dramatic changes in fire regimes over the last century. Superimposed on this changing vegetation mosaic are impacts from introduced herbivores. In this paper we identify synergistic interactions developing into positive fire-herbivory feedbacks that maximise... -
Grass defoliation affecting survival and growth of seedlings of Acacia karroo, an encroaching species in southwestern Zimbabwe
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C. Chirara --- Department of Biological Sciences, Zimbabwe P.G.H. Frost --- Department of Biological Sciences, Zimbabwe V.E.E. Gwarazimba --- Department of Biological Sciences, ZimbabweTwo experiments were conducted, one in the field and the other in the greenhouse, to investigate the effects of the intensity and frequency of grass defoliation on the survival and growth of Acacia karroo seedlings. In the greenhouse, seedlings growing... -
Grass-on-grass competition along a catenal gradient in mesic grassland, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: MJ Tedder --- School of Biological and Conservation Sciences, South Africa CD Morris --- School of Biological and Conservation Sciences, South Africa RWS Fynn --- School of Biological and Conservation Sciences, South Africa KP Kirkman --- School of Biological and Conservation Sciences, South AfricaInteractions between mature grass plants and grass seedlings have been found to be both facilitative and competitive. To examine the effects of aboveground and belowground competition on seedling biomass and the effects of soil depth on competitive interactions, seedlings of... -
Post establishment survival of Pinus patula in Mpumalanga, one year after planting
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: J. W. CrousRecent evidence indicated that the pathogen Fusarium circinatum might be contributing significantly to post-planting mortality. Consequently, sixteen experimental sample plots, widely distributed over many localities in Mpumalanga, were established over two growing seasons to quantify the extent of pest and... -
Shoot morphology and site climate affect re-establishment success of Pinus patula in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: R. G. Mitchell J. Zwolinski N. B. JonesOperational experience has indicated that Pinus patula generally survives poorly on sub-optimal growing sites in South Africa, particularly when planted as cuttings. This observation will become increasingly important as softwood species of genetically selected stock are deployed as cuttings in... -
An assessment of factors affecting early survival and growth of Pinus patula and Pinus elliottii in the summer rainfall region of southern Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: C. A. Rolando K. M. LittleHigh initial mortality of pine seedlings planted in commercial timber plantations in the summer rainfall region of southern Africa has motivated research into possible causes. The objectives of this study were to assess whether survival and initial growth of Pinus... -
A root-bound index for evaluating planting stock quality of container-grown pines
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: D.B. South R. G. MitchellPot-binding can adversely affect the performance of container-grown stock. One factor that affects pot-binding is the size of the root system in relation to the size of the container. The aim of this study was to determine if an objective... -
Phenotypic variation in fruit, seed and seedling traits of nine Uapaca kirkiana provenances found in Malawi
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: W.F. Mwase Å Bjørnstad Y.M. Ntupanyama M.B. Kwapata J.M. BokosiUapaca kirkiana is one of the priority indigenous fruit tree species for domestication in southern Africa. Natural populations of U. kirkiana are declining due to deforestation, forest fragmentation and wildfires. Knowledge of genetic variation is prerequisite for development of conservation... -
Predicted and realized genetic gain in Eucalyptus grandis breeding seedling orchard in Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: W.J. GapareResults are presented of a fourth generation breeding seedling orchard of Eucalyptus grandis Hill Maiden of 30 half-sib families. Measurements at one and half and five years were available. Analysis of one and half year data showed no significant differences... -
The Effect of Season on the Root Growth Capacity of One-Year-Old Pinus radiata Seedlings
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D. G.M. Donald --- ,The effect of season on the Root Growth Capacity (RGC) of conditioned Pinus radiata D.D. seedlings was tested for three years. Results indicate that although the species grows actively throughout the year there is still a marked seasonal fluctuation in... -
Genetic improvement of Eucalyptus grandis using breeding seedling orchards and multiple population breeding strategy in Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: W. J. Gapare --- Forest Sciences Centre, Canada R. D. Barnes --- Department of Plant Sciences, University of Oxford, United Kingdom D. P. Gwaze --- Forest Science Laboratory, College Station, USA B. I. Nyoka --- Forest Research Centre, ZimbabweEucalyptus grandis is commercially important in Zimbabwe and a breeding program has been in progress since 1962. A classical breeding strategy was used initially but, in 1981, the Multiple Population Breeding Strategy (MPBS) was implemented and the concept of the... -
Effect of planting depth on growth of open-rooted Pinus elliottii and Pinus taeda seedlings in the United States
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Curtis L. VanderSchaaf --- School of Forestry and Wildlife Sciences, and Alabama Agricultural Experiment Station, USA David B. South --- School of Forestry and Wildlife Sciences, and Alabama Agricultural Experiment Station, USAThree studies in the Coastal Plain of Georgia were remeasured 7 or 8 years after planting to determine the effects of planting depth on field performance of open-rooted seedlings [root-collar diameter (RCD) ≤ 5 mm]. Average planting depth (i.e, shoot... -
Seedling recruitment of Colophospermum mopane on the Highveld of Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: D. Mlambo --- Department of Forest Resources and Wildlife Management, Zimbabwe P. Nyathi --- Department of Forest Resources and Wildlife Management, ZimbabweFactors controlling seedling recruitment of Colophospermum mopane (Kirk ex. Benth) Kirk ex. J. Leonard were investigated on the high veld of Zimbabwe. Seed germination and seedling survival and growth were monitored under canopy and outside canopy microhabitats for a period... -
Critical water stress levels in Pinus patula seedlings and their relation to measures of seedling morphology
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: CA Rolando --- , New Zealand NW Pammenter --- , South Africa KM Little --- , South AfricaA pot trial was implemented to determine the effect of soil water stress following transplanting on shoot water potential and stomatal conductance of Pinus patula seedlings. The relationship of seedling morphology to measures of water stress was also investigated. The... -
Vermicompost leachate improves seedling emergence and vigour of aged seeds of commercially grown Eucalyptus species
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: LS Kandari --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South Africa MG Kulkarni --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South Africa J van Staden --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South AfricaVermicompost leachate (VCL) is a liquid generated by earthworms and microorganisms during the conversion of organic matter into vermicompost. Vermicompost leachate is rich in nutrients and believed to contain both known and unknown plant growth substances, which are beneficial to... -
Low light availability affects leaf gas exchange, growth and survival of Euterpe edulis seedlings transplanted into the understory of an anthropic tropical rainforest
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MLS dos Santos --- Departamento de Ciências Agrárias e Ambientais, Brazil S França --- Departamento de Ciências Agrárias e Ambientais, Brazil FP Gomes --- Departamento de Ciências Biológicas, Brazil JL do Nascimento --- Departamento de Ciências Agrárias e Ambientais, Brazil L dos Anjos Silva --- Departamento de Ciências Biológicas, Brazil MS Mielke --- Departamento de Ciências Biológicas, BrazilEuterpe edulis Mart. (Arecaceae) is a threatened palm tree of the Brazilian Atlantic Rainforest understory with fundamental importance for the restoration of degraded forest environments. We assessed the leaf gas exchange, growth and survival of E. edulis seedlings transplanted at... -
Comparison of the tolerance of Pinus patula seedlings and established trees to infection by Fusarium circinatum
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: R Glen Mitchell --- York Timbers, South Africa Michael J Wingfield --- Forestry and Agricultural Biotechnology Institute, South Africa Emma T Steenkamp --- Forestry and Agricultural Biotechnology Institute, South Africa Jolanda Roux --- Forestry and Agricultural Biotechnology Institute, South Africa Steven Verryn --- Creation Breeding Innovations cc, South Africa Teresa A Coutinho --- Forestry and Agricultural Biotechnology Institute, South AfricaSince the first appearance of Fusarium circinatum in South Africa in 1990, foresters have been challenged with poor field survival of Pinus patula seedlings at establishment. One of the best long-term solutions is to improve the genetic tolerance of P... -
Effect on nursery and field performance of Pinus patula seedlings after inoculation with Fusarium circinatum
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nicoletta B Jones --- Sappi Forests, South Africa Craig M Ford --- Sappi Forests, South Africa Marnie E Light --- Institute for Commercial Forestry Research, South Africa Ryan L Nadel --- Institute for Commercial Forestry Research, South Africa Izette Greyling --- Department of Microbiology and Plant Pathology, Tree Protection Cooperative Programme, Forestry and Agricultural Biotechnology Institute, South Africa Gerda Fourie --- Department of Microbiology and Plant Pathology, Tree Protection Cooperative Programme, Forestry and Agricultural Biotechnology Institute, South Africa Michael J Wingfield --- Department of Microbiology and Plant Pathology, Tree Protection Cooperative Programme, Forestry and Agricultural Biotechnology Institute, South Africa Andrew R Morris --- Sappi Forests, South AfricaFusarium circinatum is an important fungal pathogen of Pinus species. In South Africa, it is the most significant pathogen of Pinus patula seedlings in forestry nurseries where it presents a substantial constraint to productivity and can continue to cause mortality... -
Re-use of seedling containers and Fusarium circinatum association with asymptomatic Pinus patula planting stock
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Andrew R Morris --- Institute for Commercial Forestry Research, South Africa Gerda Fourie --- Department of Microbiology and Plant Pathology, South Africa Izette Greyling --- Department of Microbiology and Plant Pathology, South Africa Emma T Steenkamp --- Department of Microbiology and Plant Pathology, South Africa Nicoletta B Jones --- Sappi Forests, Shaw Research Centre, South AfricaFusarium circinatum is a pathogen causing serious post-planting mortality of Pinus patula seedlings in southern Africa. Containerised planting stock that is asymptomatic but associated with F. circinatum in the nursery is thought to be the cause of this problem. The... -
Effects of plantation residue management on the community structure of wattle regeneration invertebrate pests in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Prem Govender --- Research Directorate, Faculty of Health Sciences, South AfricaThere is a limited availability of land for the expansion of South African black wattle plantations. One way to increase productivity is to ensure the survival of seedlings during regeneration, thereby increasing the stocking of compartments. Soil invertebrate pests constitute... -
Applied disease screening and selection program for resistance to vascular wilt in Hawaiian Acacia koa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nicklos S Dudley --- Hawai'i Agriculture Research Center, USA Tyler C Jones --- Hawai'i Agriculture Research Center, USA Robert L James --- Plant Disease Consulting Northwest, USA Richard A Sniezko --- United States Department of Agriculture Forest Service, USA Phil Cannon --- United States Department of Agriculture, USA Dulal Borthakur --- University of Hawai'i at Manoa, USAAcacia koa is a valuable tree species economically, ecologically and culturally in Hawai'i. A vascular wilt disease of A. koa resulting from infection by the fungal pathogen Fusarium oxysporum f. sp. koae (FOXY) causes high rates of mortality in field... -
Fire and the dynamics of two unpalatable grass species (Cymbopogon pospischilii and Elionurus muticus) in a semi-arid climate
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hennie A Snyman --- Animal, Wildlife and Grassland Sciences, South AfricaCymbopogon pospischilii and Elionurus muticus are unpalatable for most of the growing season and form a reasonably large component of the vegetation composition in semi-arid grassland areas. The influence of an accidental fire on the dynamics of these two grass... -
Seed quality of selected bottle gourd landraces compared with popular cucurbits
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nkanyiso J Sithole --- Crop Science Discipline, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science Discipline, School of Agricultural, Earth and Environmental Sciences, South Africa Tafadzwanashe Mabhaudhi --- Crop Science Discipline, School of Agricultural, Earth and Environmental Sciences, South AfricaBottle gourd (Lagenaria siceraria (Molina) Standl.) is an indigenous crop that is available only as landraces in sub-Saharan Africa, although it has a great potential for food security. Pumpkin (Cucurbita maxima L.) and cucumber (Cucurbita pepo L.) are exotic crops... -
Crop rotation and tillage system effects on reducing ryegrass occurrence in spring wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sinovuyo M Nteyi --- Department of Agricultural Management, South Africa Raymond MB Auerbach --- Department of Agricultural Management, South Africa Michael I Ferreira --- Plant Sciences, South Africa Johan Labuschagne --- Plant Sciences, South AfricaUnder the Mediterranean climatic conditions of the Western Cape province, the Swartland region is intensively cropped, producing spring wheat (Triticum aestivum L.), but due to ryegrass competition, yield is reduced. In addition, ryegrass has developed resistance to herbicides. This necessitates... -
Evaluation of mefenoxam and fludioxonil for control of Rhizoctonia solani, Pythium ultimum and Fusarium solani on cowpea
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tshekgene M Ramusi --- Department of Plant and Soil Sciences, South Africa Jacquie E van der Waals --- Department of Plant and Soil Sciences, South Africa Nico Labuschagne --- Department of Plant and Soil Sciences, South Africa Theresa AS Aveling --- Department of Plant and Soil Sciences, South AfricaCowpea (Vigna unguiculata) is susceptible to pathogens such as Rhizoctonia solani, Pythium ultimum and Fusarium solani, which cause seedling diseases in cowpea and result in low yields. Three commercial synthetic fungicides containing mefenoxam 350 g ai L−1, mefenoxam 240 g ai L−1... -
Valuable Russian wheat aphid-resistant bread wheat accessions identified using four South African Diuraphis noxia biotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Vicki L Tolmay --- Agricultural Research Council-Small Grain Institute, South Africa Mardé Booyse --- Agricultural Research Council Infruitec-Nietvoorbij, South AfricaResistance-breaking biotypes of Diuraphis noxia have been reported in both the USA and South Africa where commercial cultivars with genetic resistance to this pest have been deployed. The need to identify novel Russian wheat aphid (RWA) resistance for deployment against... -
Effect of seed size on field survival and growth of Eucalyptus in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: RD Naidu NB JonesThis study was established to determine the effect of seed size on nursery performance, field survival and growth. Results indicated that germination was greater for larger seed whereas the smallest seeds germinated poorly. In addition, seedling survival in the nursery... -
Determination of optimum ethylmethanesulfonate conditions for chemical mutagenesis of selected vernonia (Centrapalus pauciflorus) accessions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile T Hadebe --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Hussein A Shimelis --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaChemical mutagenesis could potentially increase allelic diversity and address genetic erosion in vernonia (Centrapalus pauciflorus) breeding programmes. The objective of this study was to determine an optimum treatment combination, i.e. exposure duration, temperature and ethylmethanesulfonate (EMS) dose that would reduce... -
Improved parameters of Pinus greggii seedling growth and health after inoculation with ectomycorrhizal fungi
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rebeca Casique Valdés --- Department of Horticulture, Mexico Rosalinda Mendoza Villarreal --- Department of Horticulture, Mexico Fernando Galindo García --- Department of Horticulture, Mexico Susana González Morales --- Department of Horticulture, Mexico Sergio Sanchez Peña --- Department of Parasitology, MexicoPinus greggii Engelm. ex Parl. is an endemic pine of Mexico with notorious adaptability to eroded, shallow and poor soils. It is widely used in reforestation programmes worldwide. The purpose of the present study is to develop an ectomycorrhizal fungi... -
Optimising the dosage of ethyl methanesulphonate mutagenesis in selected wheat genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Boluwatife M Olaolorun --- School of Agricultural, Earth and Environmental Sciences, South Africa Hussein A Shimelis --- School of Agricultural, Earth and Environmental Sciences, South Africa Isack Mathew --- School of Agricultural, Earth and Environmental Sciences, South Africa Mark D Laing --- School of Agricultural, Earth and Environmental Sciences, South AfricaNarrow genetic variation limits the success of crop improvement programs. Mutagenesis using ethyl methane- sulphonate (EMS) provides an opportunity to increase genetic variation to enhance selection in wheat improvement. This study aimed at establishing the optimum dosage and treatment conditions... -
Predictions of chlorophyll concentrations in the leaves of seedlings of two congeneric tropical trees from RGB digital image components
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Marcelo Schramm Mielke --- , Brazil Luciana Santos Lobo --- , Brazil Geane Santos da Costa --- , Brazil Ana Cristina Schilling --- , Brazil Martielly Santana dos Santos --- , Brazil Ândrea Carla Dalmolin --- , BrazilThe segmentation of digital images in red, green and blue (RGB) components is a low-cost method for monitoring leaf chlorophyll concentrations and seedling quality. The two congeneric species, Cariniana legalis and C. estrellensis, are distinguished based on differences in bark... -
Time of permanence and rooting quality of minicuttings of eucalypt clones
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Glauce Taís de Oliveira Sousa Azevedo --- , Brazil Anderson Marcos de Souza --- , Brazil Gileno Brito de Azevedo --- , Brazil Paulo Eduardo Teodoro --- , Brazil Larissa Pereira Ribeiro Teodoro --- , Brazil José Raimundo Luduvico de Sousa --- , BrazilEstablishing the optimal time for rooting permanence and evaluation of the rooting quality of eucalypt clones allows us to optimise the production process and increase the quality of the seedlings produced. This study aimed to determine the optimal time for... -
Post-fire tree regeneration from seed of the endangered Nothofagus alessandrii Espinosa in the Maule region of central Chile
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Persy Gómez --- , Chile Sergio Espinoza --- , Chile Pedro Garrido --- , Chile José San Martín --- , Chile Yony Ormazábal --- , ChileThe endemic ruil (Nothofagus alessandrii Espinosa) forest is one of the most endangered forest ecosystems in central Chile, where its regeneration is challenged by factors such as low seedling germination capacity and recently by fire. In this study, we sampled... -
The chemistry of the pedoderm – part 2: Dichrostachys cinerea patches and adjacent grassland in the southern Kruger National Park, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony J Mills --- , South Africa Tercia Strydom --- , South Africa Jessica L Allen --- , South AfricaThe small tree, Dichrostachys cinerea, occurs in dense patches within grasslands on gabbro-derived soils in the southern Kruger National Park. It is not known whether soil properties in the grasslands affect tree establishment. As a first step in identifying soil... -
The effect of crop rotation and tillage practice on residue decomposition and wheat performance in the Western Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Johannes Stephanus Theron --- Stellenbosch University, South Africa Gerhardus Johannes van Coller --- , South Africa Lindy Joy Rose --- Stellenbosch University, South Africa Johan Labuschagne --- Stellenbosch University, South Africa Pieter Andreas Swanepoel --- Stellenbosch University, South AfricaConservation agriculture relies on residue retention, crop rotation and reduced tillage. Crop rotation determines residue type, while tillage affects residue load and distribution. Although crop residue retention is often beneficial, residues can create challenges, including obstruction of planters during establishment... -
Gibberellic and salicylic acids improve seedling emergence, early growth and some physiological characteristics of Phaseolus vulgaris L. under soil compaction
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Hamid Reza Eisvand --- Lorestan University, Iran Hadis Nasrollahi --- Lorestan University, Iran Feizollah Shahbazi --- Lorestan University, Iran Mohammad Feizian --- Lorestan University, Iran Donald L Smith --- McGill University, CanadaHeavy soil compaction and crusting adversely affect the percentage and speed of seedling emergence, particularly in dicotyledonous epigeal plants. This study aimed to evaluate ways to cope with this phenomenon in kidney bean through hormonal priming. A factorial experiment was...