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Factors affecting theaflavin values of black tea in South Africa: A preliminary analysis
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 AfricaThe highest theaflavin (TF) contents associated with five tea clones grown in the Eastern Transvaal were encountered in the manufactured tea from ‘MT 12’ followed by ‘SFS 204’, with ‘Veld 35’ and ‘Veld 43’ having the lowest values. TF contents... -
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... -
Leaf characters of various tea clones in relation to quality
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.J. Robbertse --- , Republic of South Africa Elsie M.A. Steyn --- , Republic of South AfricaThe leaves of ten different tea clones were investigated to explore the possibility that structural differences exist between clones and that morphological characters relate to the quality of the infusion. Our results revealed a significant negative correlation between TF-values and... -
Variation of agronomic traits of potato somaclones produced by meristem culture
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Viive Rosenberg --- Plant Biotechnological Research Centre EVIKA Saku, Estonia Marje Särekanno --- Plant Biotechnological Research Centre EVIKA Saku, Estonia Katrin Kotkas --- Plant Biotechnological Research Centre EVIKA Saku, Estonia Virge Vasar --- Plant Biotechnological Research Centre EVIKA Saku, Estonia Ann Ojarand --- Plant Biotechnological Research Centre EVIKA Saku, EstoniaFollowing a thermotherapy virus eradication procedure potato plantlets were multiplied as meristem clones in vitro. The agronomic traits of meristem clones were compared in field trials over three years. A total of 16 meristem clones of cultivar Agric dzeltenie and... -
SALINITY, FLOODS AND THE INFAUNAL MACROBENTHIC COMMUNITY OF THE ST LUCIA ESTUARY, KWAZULU-NATAL, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: R. K. Owen --- , , South Africa A. T. Forbes --- , , South AfricaThe St Lucia estuary and lake comprise some 80 % of the estuarine area of KwaZulu-Natal. The system is subject to floods and hypersaline conditions, the latter twice exceeding 100 since 1970. The lake is connected to the sea by... -
Insights from full-rotation Nelder spacing trials with Eucalyptus in São Paulo, Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JL Stape --- Department of Forestry and Environmental Resources, USA D Binkley --- Natural Resource Ecology Laboratory, USAThe choice of spacing among trees for operational plantations is typically based on one or more experimental plantations that test for the response of tree and stand growth to a range of tree-to-tree distances. The most common design for spacing... -
Final results from a trial to test the effect of plot size on Eucalyptus hybrid clonal ranking in coastal Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: TK Stanger --- , South Africa GM Galloway --- Shaw Research Centre, South Africa ECL Retief --- Shaw Research Centre, South AfricaHybrid clones with Eucalyptus grandis as one parent and, generally, E. urophylla as the other parent, are deployed commercially as monoclonal blocks by Sappi in the subtropical region of coastal Zululand, South Africa. In monoclonal blocks genotypes are grown in... -
A comparison of planting and coppice regeneration of Eucalyptus grandis × Eucalyptus urophylla clones in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jacob W Crous --- Sappi Forests, South Africa Louisa Burger --- Department of Forest and Wood Science, South AfricaResults from two coppice compared to replant trials are presented that originated from clone by site interaction (CSI) trials established on high‑ and low‑productivity sites in subtropical coastal KwaZulu‑Natal, South Africa. After the 84‑month CSI trial measurements were completed the... -
Restoration of Lake St Lucia, the largest estuary in South Africa: historical perceptions, exploitation, management and recent policies
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NT Forbes --- Marine and Estuarine Research, Hyper-by-the-Sea, South Africa AT Forbes --- Marine and Estuarine Research, Hyper-by-the-Sea, South Africa B James --- iSimangaliso Wetland Park Authority, Dredger Harbour, South AfricaRestoration of estuarine function to the Lake St Lucia system, the largest estuary in South Africa, was initiated in 2010. Significant change began with the reversal of a mouth management policy that was adopted in 1952 and maintained for the... -
Rooting potential of the ‘vleitee’ honeybush (Cyclopia subternata) as affected by growth season and the manipulation of stock plant characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: --- Directorate Plant Sciences, South Africa --- Stellenbosch University, South Africa --- Stellenbosch University, South Africa --- Stellenbosch University, South AfricaTo ensure a high-quality, sustainable supply of South African indigenous honeybush (Cyclopia spp.) tea to domestic and international markets, a shift from wild harvesting practices to true-to-type clonal material is required. This study investigated the impact of stock plant rejuvenation... -
Silvicultural management strategies for climate change mitigation with the focus on plantation forests
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ben du Toit --- Stellenbosch University, South AfricaThis technical note explores several practical actions whereby short-rotation plantation forests in warm climates can be managed for increased resilience in the face of climate change. It includes landscape level issues such as ecosystem resilience, limiting the invasive tendencies of...