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Effects of season of burn on shrub survival, regeneration and structure in the Natal Drakensberg
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: F.R. Smith --- Department of Environment Affairs, Directorate of Forestry, N.M. Tainton --- Department of Grassland Science,Four shrub species which tend to invade unburnt grassland were studied in field‐burning trials at Cathedral Peak in the Natal Drakensberg. -
Die invloed van die beskikbaarheid van nutriënte en ontblaringsbestuur op die produksie van digitar1a Eriantha variëteit Eriantha
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P A Pieterse --- Departement Plantproduksie,Die invloed van verskillende peile van stikstof (N), fosfaat (P) en kalium (K) op die produksie en kwaliteit van Digitaria eriantha var. eriantha is in sandkultuur ondersoek. Verder is daar ook gekyk na die invloed van drie intensiteite van ontblaring... -
Effect of intensity of defoliation by goats at different phenophases on leaf and shoot growth of acacia karroo hayne
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- , B.H. Walker --- Botany Department,Defoliation by goats (leaves plus shoots) during the growing phenophases resulted in a considerable stimulation of leaf and shoot growth relative to non‐defoliated plants. The response differed considerably depending on the intensity and phenophase of defoliation. Plants were most susceptible... -
Water utilization patterns around isolated Acacia karroo trees in the False Thornveld of the eastern Cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.C. Stuart‐Hill --- Department of Agriculture and Water Supply (East Cape Region), Republic of South Africa N.M. Tainton --- Department of Agriculture and Water Supply (East Cape Region), Republic of South AfricaThe effect of various vegetation treatments on two soil moisture regimes (i.e. the proportion of the experimental period where the soil had sufficient water for: (a) growth, and (b) to keep the plants turgid in the vicinity of experimentally isolated... -
Partitioning, storage and remobilization of 14C assimilated by Themeda triandra Forssk1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture and Water Supply (Eastern Cape Region), Republic of South Africa A.J. Gordon --- , United KingdomThe second youngest fully‐expanded leaf on the main tiller of vegetative Themeda triandra plants was exposed to 14CO2. Thereafter, quantitative analysis of partitioning, storage and remobilization after defoliation of 14C‐labclled assimilate was conducted in serially‐harvested plants over a 27‐day period... -
Response of Cymbopogon validus tillers to three clipping frequencies
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: SheonaE. Shackleton --- Department of Botany, Transkei M.T. Mentis --- Department of Botany, Republic of South AfricaThe response of tagged Cymbopogon validus tillers to three clipping frequencies indicated that this species is intolerant of severe and frequent defoliation. This could account for its decreased abundance in heavily‐grazed areas in and around Mkambati Game Reserve, Transkei. -
Cyclic patterns of growth and rubber deposition in guayule Parthenium argentatum. Suggestions for a management programme
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.G. Gilliland --- , J. van Staden --- ,As the natural pattern of development and rubber synthesis in guayule (Parthenium argentatum) is cyclic any treatments to improve growth and rubber production should be synchronized with the normal sequence of events pertaining to growth and metabolism. Starting with 25-week-old... -
Root dynamics of Themeda triandra Forsk. in relation to water stress and defoliation at different phenological stages
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: I.B. Oosthuizen --- Department of Animal, Wildlife and Grassland Sciences, South Africa H.A. Snyman --- Department of Animal, Wildlife and Grassland Sciences, South AfricaThe impact of water stress on root growth for the indigenous apomectic C4-grass species Themeda triandra was determined over a growing season covering three growth stages (vegetative, pipe and reproductive), as well as for regrowth occurring to one, three and... -
Effects of selective defoliation and height of defoliation on tiller dynamics and herbage yield of Themeda triandra in a semi-arid rangeland in Zimbabwe
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: S. Dube V.E.E. GwarazimbaUnderstanding the impacts of intensity and selection of grazing on the performance of grasses is important in the management of grazing areas. It is especially important in semi-arid environments where, apart from moisture, the levels at which grasses are utilized... -
Short-term response of burnt grassland to defoliation in a semi-arid climate of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: HA SnymanThe impact of defoliation on the productivity and soil temperature of burnt grassland (head and back fires) was investigated over the short term (one and two growing seasons after burning). Head fires had greater flame height and rate of spread... -
Production of irrigated Trifolium repens L. under a cutting regime in the subtropical region of Gauteng, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M. Trytsman --- , Republic of South Africa A.J. Kruger --- , Republic of South Africa V.D. Wassermann --- , Republic of South Africa M.A. Stoltz --- , Republic of South AfricaThe productivity of Trifolium repens L. cv. Ladino, under irrigation in the subtropical region of Gauteng, South Africa, is unknown. The performance of T. repens was determined over five years (1981/1982 to 1985/1986), at two defoliation frequencies, four levels of... -
Growth response at age 10 years of five Eucalyptus genotypes planted at three densities on a drought-prone site in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jacob Crous --- Sappi Forests, South Africa Louisa Burger --- Department of Forest and Wood Science, South Africa Giovanni Sale --- Sappi Forests, South AfricaSouth Africa's climate is characterised by the occurrence of regular droughts. An assessment of drought mortality in KwaZulu-Natal during 1999 could not provide accurate information regarding the effect of species or planting density on mortality because of confounding species-site allocations... -
Can brush-cutting of Pteronia paniculata improve the composition and productivity of veld in the Succulent Karoo, South Africa?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: N Saayman --- Department of Agriculture: Western Cape, South Africa CD Morris --- Agricultural Research Council, South Africa MB Hardy --- Department of Agriculture: Western Cape, South Africa JC Botha --- Department of Agriculture: Western Cape, South AfricaPteronia paniculata is an indigenous, unpalatable shrub that invades mismanaged Karooveld, resulting in degraded rangelands with low species diversity and grazing potential. We conducted a series of trials in the Succulent Karoo Randteveld near Barrydale to determine if the uniform... -
The effect of pre-harvest wind damage on post-harvest quality of ‘Triumph’ persimmon fruit
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Pesanai Zanamwe --- Department of Botany and Biotechnology, South AfricaThe post-harvest quality of ‘Triumph’ persimmon fruits grown in the Western Cape, South Africa varies with seasons. Poor post-harvest fruit quality is assumed to be associated with seasons that are characterized by violent wind occurrences. This study was carried out... -
Response of three mesic South African perennial grassland forbs to defoliation and competition
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Sindiso Chamane --- Grassland Science, School of Life Sciences, South Africa Kevin P Kirkman --- Grassland Science, School of Life Sciences, South Africa Craig Morris --- Agricultural Research Council – Animal Production, c/o School of Life Sciences, South Africa Tim G O’Connor --- SAEON, South AfricaThe importance of maintaining biodiversity in natural grasslands under livestock production systems has been recognised. Forbs contribute more to species richness than grasses in South African grasslands. However, little is known about the impact of grazing and grass competition on...