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An Evaluation of the Use of “Gentan” Probabilities in Forestry Planning
Item type: Journal Article • Journal: South African Forestry Journal • Authors: JohnH. Randall --- Department of Biometry, South Africa Klaus von Gadow --- Department of Forest Science, South AfricaAn evaluation of Suzuki's concept of Gentan probabilities is presented. Model fitting is discussed in some detail. It is shown that the Gentan method is suitable only for forests that are at least close to normality. -
Root-shoot Growth Periodicity in Ocotea bullata
Item type: Journal Article • Journal: South African Forestry Journal • Authors: H. Kotze --- Division of Forest Science and Technology, Saasveld Forestry Research Centre, South Africa C.J. GeldenhuysPeriodicity in leaf fall, and in the growth of roots and shoots of Ocotea bullata was studied. Leaf fall of canopy trees was measured to establish the natural phenological pattern of mature trees. Shoot growth was measured on potted plants... -
An evaluation of rootstocks for apricots on sandy soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.D. Stadler --- , Republic of South Africa P. J.C. Stassen --- , Republic of South AfricaThe nematode-resistant rootstocks Okinawa and Nemaguard yielded better than all other rootstocks for Royal on sandy soil. Bulida performed best on apricot seedling rootstock followed by Okinawa. Prunus mume did not appear promising for either Royal or Bulida. Both Royal... -
Pruimonderstamme: Verdere evaluaste van plaaslik-geteelde klone
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.H. Acker --- , Republiek van Suid-Afrika F.J. Calitz --- , Republiek van Suid-AfrikaDrie-en-twintig plaaslik-geteelde pruimonderstamseleksies is met virusvrye, klonale Marianna, virusbesmette Marianna en perskesaailing vergelyk. In teenstelling met perskesaailing wat oorwegend Kakamas en Du Plessis is, word hierdie seleksies vegetatief vermeerder. Kumulatiewe opbrengs, stamomtrek en opbrengsdoeltreffendheid is as maatstawwe vir vergelyking gebruik... -
Storage root formation at individual nodes of the sweet potato (Ipomoea batatas (L.) Lam)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.P. du Plooy --- , Republic of South Africa A.A. van den Berg --- , Republic of South Africa P.S. Hammes --- Department of Plant Production, Republic of South Africa L.C. Holtzhausen --- Department of Plant Production, Republic of South AfricaLittle or no information is available on the contribution of individual subterranean nodes to the storage root formation in sweet potatoes. Therefore, two field trials were conducted where apical vine cuttings of various cultivars were planted vertically or horizontally, with... -
The effect of chloride on four different citrus rootstocks
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- , Republic of South Africa N. Labuschagne --- Department of Microbiology and Plant Pathology, Republic of South Africa R.O. Barnard --- Department of Soil Science and Plant Nutrition, Republic of South Africa J.M. Kotzé --- Department of Microbiology and Plant Pathology, Republic of South AfricaSeedlings of Troyer citrange [Poncirus Mollata L. Raf. × Citrus sinensis L. Osbeck] (Tro), Citrus volkameriana (Vol), Carrizo citrange [Poncirus trifoliata L. Raf. × Citrus sinensis L. Osbeck], (Car) and Rough lemon [Citrus jambhiri Lush.] (Rie) were tested for tolerance... -
Die invloed van grondsuurheid op koringkultivars (Triticum aestivum L.) met verskillende vlakke van aluminiumverdraagsaamheid in die Oos-Vrystaat. II. Wortelontwikkeling
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. J.H. Bosch --- , Republiekvan Suid-Afrika W.M. Otto --- , Republiekvan Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-Afrika'n Veldproef is uitgevoer in die Oos-Vrystaat om te bepaal of kultivars wat verskil in aluminium (Al)-verdraagsaamheid ook verskil in wortelontwikkeling by verskillende grondsuurheidsvlakke. Drie kultivars wat varleër in Al-verdraagsaamheid is by vier grondsuurheidsvlakke in 'n verdeelde-perseelontwerp getoets. Die twee... -
Rootstock-dependent soil respiration in a citrus orchard
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. Keutgen --- Department of Horticultural Science, Republic of South Africa M. Huysamer --- Department of Horticultural Science, Republic of South AfricaSoil respiration is a major contributor to the carbon flux in apple orchards, but very little data exist for citrus. Daytime soil respiration, grass respiration, and grass photosynthesis were recorded in a ‘Nules’ clementine (Citrus reticulata Blanco) orchard on ‘Carrizo’... -
Effect of BP1, BP3 and Quince A rootstocks, at three planting densities, on precocity and fruit quality of ‘Forelle’ pear (Pyrus communis L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. du Plooy --- , Republic of South Africa P. van Huyssteen --- , Republic of South Africa‘Forelle’ pear trees (Pyrus communis L.) were established at the Bien Donné experimental farm in the Western Cape Province of South Africa on BP1, BP3 and Quince A rootstocks at three planting densities, i.e., 889, 1667 and 2857 trees. ha... -
Lateral root production of witloof chicory (Cichorium intybus L.) in response to ebb-and-flood nutrient supply in hydroponics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R. König --- Department of Agronomy, Republic of South Africa N. J.J. Combrink --- Department of Agronomy, Republic of South AfricaWitloof chicory is currently grown on a large scale by making use of gravity-driven hydroponic cascade systems. A possible drawback of this method may be that the taproot is only submerged in the nutrient solution to a depth of about... -
Effect of gravity on the quality of witloof chicory (Cichorium intybus L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R. König --- Department of Agronomy, Republic of South Africa N. J.J. Combrink --- Department of Agronomy, Republic of South AfricaIn order to establish the effect of gravity on chicon quality and yield, witloof chicory roots were forced at three angles. It was shown that roots forced in a horizontal position produced a significantly lower marketable chicon yield than roots... -
The effect of rootstock cultivar on the yield and fruit quality of ‘Packham's Triumph’, ‘Doyenne du Comice’, ‘Forelle’, ‘Flamingo’ and ‘Rosemarie’ pears
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.N. Jacobs --- Department of Horticultural Science, South Africa N.C. Cook --- Department of Horticultural Science, South AfricaProduction data and questionnaire results concerning the long-term effects of various rootstocks on pear (Pyrus communis L.) yield indicated that BP1 and BP3 are currently the preferred rootstocks in the South African industry. Yield records of ‘Packham's Triumph’ pears indicated... -
Citrus tristeza virus cross-protection of ‘Palmer’ navel orange in the Eastern Cape Province of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.P. van Vuuren --- , J.G.J. Maritz --- , N. Combrink --- ,Citrus tristeza virus (CTV) is endemic in southern Africa due to the abundance of the citrus brown aphid, To x -optera citricida Kirk., the main insect vector. Virus-free propagation material in the Southern African Citrus Improvement Scheme is pre-inoculated with... -
Component dry masses and carbohydrate contents in honeybush I: Cyclopia genistoides
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J Wooldridge --- , South Africa ME Joubert --- , South Africa M Booyse --- , South AfricaCyclopia (honeybush), a new and largely unstudied South African horticultural crop, was investigated by carrying out a reconnaissance-level survey of C. genistoides (Cg) populations. Four-year average total dry mass (DM) in plantation-grown Cg cuttings and seedlings, and wild (veld) plants... -
Themeda triandra: a keystone grass species
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hennie A Snyman --- Animal, Wildlife and Grassland Sciences, South Africa Lachlan J Ingram --- Plant Breeding Institute, Faculty of Agriculture and Environment, Australia Kevin P Kirkman --- Grassland Science, South AfricaThemeda triandra is a perennial tussock grass endemic to Africa, Australia and Asia. Within these regions it is found across a broad range of climates, geological substrates and ecosystems. Because it is widespread across these areas it has great economic... -
Seasonal and spatial distribution of roots and arbuscular mycorrhizal fungi under live fences of Acacia laeta and Acacia mellifera in Sénégal
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: O. Diagne A.S. Seck Y.K. Gassama-DiaSoils were sampled around live fences of A. laeta and A. mellifera plots in an experimental research site of the Senegalese Institute of Agricultural Research at Bambey, Sénégal. They were collected before and after the rainy season at three distances... -
Initiating community participation: the stakeholder communication and environmental education programme
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJM GabrielUnder the new National Water Act the River Health Programme has Stakeholder Communication and Environmental Education (SCEE) as one of its components. This programme seeks to develop tools to help water resource managers involve previously disadvantaged communities in managing river... -
Frugality, Grassroots and Inclusiveness: New Challenges for Mainstream Innovation Theories
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mario Pansera --- University of Exeter Business School, UKIntriguing and provocative concepts such as frugal innovation, Bottom of the Pyramid (BOP) innovation, empathetic innovation and inclusive innovation are attracting the attention of many scholars in emerging countries as well as raising concern in Western countries. These notions are... -
Influence of land use on phytomass accumulation in Highland Sourveld grassland in the southern Drakensberg, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: TG O'ConnorTransformation of indigenous vegetation for production purposes impacts negatively on biodiversity but does this necessarily equate with a decrease in phytomass accumulation, which may influence carbon sequestration? Phytomass accumulation was studied for common land covers of beef ranching or dairy... -
Dynamic networks of grassroots innovators in India
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Hemant Kumar --- Center for Studies in Science, Technology and Innovation Policy, Central University of Gujarat, India‘Grassroots innovations’ in India are receiving increasing attention from innovation scholars and policymakers alike. These innovations are individual or community efforts to solve the problems faced in one's daily life. Moreover, rather than responding to any ‘potential market’ demand, these... -
Price earnings ratios on the Johannesburg Stock Exchange - Are they a guide to value?
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: G D I Barr --- Department of Statistical Science and Economics, B S Kantor --- Department of Economics,This paper tests whether there is an equilibrium relationship between prices and earnings on the Johannesburg Stock Exchange (JSE). Such a relationship would hold if the JSE Index and index earnings were cointegrated, A full explanation of the technique of... -
Carbon stocks in a 50‑year‑old Eucalyptus camaldulensis stand in Sicily, Italy
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Riccardo Scalenghe --- Dipartimento Scienze Agrarie e Forestali, Italy Luisella Celi --- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Italy Giovanna Costa --- Dipartimento Scienze Agrarie e Forestali, Italy V Armando Laudicina --- Dipartimento Scienze Agrarie e Forestali, Italy Stefania Santoni --- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Italy Dario Vespertino --- Dipartimento Scienze Agrarie e Forestali, Italy Tommaso La Mantia --- Dipartimento Scienze Agrarie e Forestali, ItalyEucalyptus stands in semi‑arid areas may contribute to enhance carbon (C) stocks in both biomass and soil. However, the limited information available is mainly focused on short‑rotation plantations. In this study, the above‑ and below‑ground C pools in five 50‑year‑old... -
Analyzing the grassroots innovation process in India from a design perspective
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gautam Sharma --- , IndiaDesign is the act of transforming an existing situation into a preferred one. Taking this broad definition of design, the paper analyzes the process of grassroots innovations from a design perspective in the three phases of idea generation, experimentation, and... -
A note on the sum of finite multiple harmonic q-series on r-(r + 1) indices
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Zhonghua Li --- Tongji University, China Zhenlu Wang --- Tongji University, ChinaWe study the sum of the finite multiple harmonic q-series on r-(r + 1) indices at roots of unity with r = 1, 2, 3. Mainly, we give equivalent conditions of two conjectures regarding cyclic sums of finite multiple harmonic... -
Indicators of grassroots innovations in Iran: A mixed method study
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Akram Ghadimi --- , Marzieh Saviz --- Department of Psychology and Education, University of Tehran, Tehran, Iran,Grassroots innovations are bottom-up solutions for solving problems that meet local needs and take into account their interests and values. The main purpose of this study is to identify the indicators of grassroots innovations in Iran. This research is based... -
Revitalizing tribal economic systems through indigenous entrepreneurship: Innovations and strategies
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Anjali Chandulal Lakum --- Parul Institute of Social Work, Parul University, IndiaAmid growing global interest in sustainable and inclusive development, indigenous entrepreneurship and grassroots innovations are increasingly recognized as powerful yet underexplored pathways for community resilience. This study investigates how such innovations contribute to the revitalization of tribal economic systems, with...