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Production and quality norms of certain grass species for fodder flow planning: Pretoria area
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.O. Grunow --- Department of Plant Production, J.W. Rabie --- Department of Plant Production,Four subtropical (Cenchrus. Digitaria, Anthephora and Sorghum) and two temperate grass species (Festuca. Agrotricum) were grown in a replicated field experiment at three levels of N application, with adequate P and K. Species were mown at 4‐, 6‐ and 8‐weekly... -
Groei en produksie van ‘n aanal aangeplante weidings onder beweiding
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.A. Pieterse --- Dept Plantproduksie, J.O. Grunow --- Dept Plantproduksie, N.F.G. Rethman --- Dept Plantproduksie,Die groei en produksie onder beweiding van ‘n aantal aangeplante weidings is met behulp van die verskilmetode bepaal. Uit die data verkry in die proef is dit duidelik dat indien daar besproeiingswater beskikbaar is, groen materiaal dwarsdeur die jaar voorsien... -
The herbage yield and quality of three grass species on two marginal maize soils at Potchefstroom
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.S. Dannhauser --- , Republic of South AfricaA small plot experiment with Digitaria eriantha, Panicum maximum and Anthephora pubescens, established on Valsrivier and Westleigh soil forms, was conducted at Potchefstroom during the 1986/87 and 1987/88 seasons. The yield of P. maximum was the highest of the three... -
A review of the post harvest handling of fruits in South Africa over the past twenty five years
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Dodd --- , P. Cronje --- , M. Taylor --- , M. Huysamer --- , F. Kruger --- , E. Lotz --- , K. van der Merwe --- ,During the past 25 years there has been a tremendous amount of positive change in the post harvest handling of fruits in South Africa, primarily due to the adoption of many new technologies developed in response to changes in the... -
POPULATION DYNAMICS AND DEMOGRAPHY OF AN ESTUARINE COPEPOD (PSEUDODIAPTOMUS EESSEI) IN LAKE SIBAYA, A SUBTROPICAL FRESHWATER COASTAL LAKE
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: RC Hart --- , South AfricaPopulation size and stage structure of Pseudodiaptomus hessei (Mrázek) was studied over 27 months at a single site in subtropical Lake Sibaya. Population density varied seasonally from about 1 to 4 individuals per litre, but a fairly stable population structure... -
A LIMNOLOGICAL PROFILE OF THE UPPER OKAVANGO DELTA AT LOW WATER LEVEL
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: Rob C. Hart --- ,Selected limnological attributes of the Okavango Delta panhandle were measured during a brief summer survey of “open-water” habitats extending from the permanent mainstream channel, through contiguous off-channel lagoons and still backwaters, to seasonally isolated floodplain lagoon and temporary pool biotopes... -
Dry matter yield and water use efficiency of five perennial subtropical grasses at four levels of water availability
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: D Marais N Rethman J AnnandaleThe effect of four levels of water availability on the yield and water use efficiency (WUE) of five subtropical perennial grasses was evaluated in a small plot trial under a rain shelter. The soil profiles were brought to 100% (W4... -
Research note: The effect of a lactic acid bacterial inoculant on the fermentation dynamics of Eragrostis curvula during ensiling
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: R. Meeske --- , Republic of South Africa H.M. Basson --- , Republic of South AfricaMaking good quality hay from Eragrostis curvula is a risky operation in many areas in South Africa due mainly to unfavourable weather conditions. Ensiling should therefore be considered as an alternative method for conserving the forage. The aim of this... -
Climate change perceptions, drought responses and views on carbon farming amongst commercial livestock and game farmers in the semiarid Great Fish River Valley, Eastern Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: CL Clarke --- Department of Environmental Science, South Africa SE Shackleton --- Department of Environmental Science, South Africa M Powell --- Department of Environmental Science, South AfricaThere is increasing evidence that climate change will be one of the primary challenges facing future development and agriculture. Farmers, whether crop or livestock farmers, will be faced with tradeoffs and constraints as climate change exposes them to greater risk... -
The zooplankton community of Lake Kariba in 1962/63 following impoundment of the Zambezi River
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Harding NA RaynerLake Kariba, bordered by Zambia in the north and Zimbabwe in the south, was formed following the impoundment of the the Zambezi River in 1955. Pre- and post-impoundment studies, which were undertaken on Lake Kariba by the Joint Fisheries Research... -
Buoyancy-stirring interactions in a subtropical embayment: a synthesis of measurements and model simulations in Maputo Bay, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JD Lencart e Silva --- , UK JH Simpson --- , UK AM Hoguane --- School of Marine and Coastal Sciences, Mozambique J-L Harcourt-Baldwin --- Department of Oceanography, South AfricaMaputo Bay, on the coast of Mozambique, is a tidally energetic, subtropical embayment in a region subjected to strong seasonal rainfall. Data from moored current meters, tide gauges and monthly bay-wide surveys were used to characterise the evolution of the... -
A benthic survey of the rocky reefs off Pondoland, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Celliers BQ Mann AHH Macdonald MH SchleyerA subtidal marine biodiversity survey was carried out on shallow reefs (−1m to −30m) in the proclaimed Pondoland Marine Protected Area between Port Edward and Port St Johns, South Africa. A total of 26 benthic reef transects was undertaken involving... -
Decline of Terebralia palustris in South African mangroves
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JL Raw --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa RH Taylor --- School of Hydrology, South Africa NAF Miranda --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa N Peer --- DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaTerebralia palustris (Linnaeus, 1767), the giant mangrove whelk, is a prominent component of mangrove ecosystem malacofauna in the Indo-West-Pacific region. On the east coast of Africa, the range of T. palustris extends from Kenya to the south-eastern region of South... -
The incidence of torpor in winter and summer in the Angolan free-tailed bat, Mops condylurus (Microchiroptera: Molossidae), in a subtropical environment, Mpumulanga, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: L. Vivier --- Zoology Department, South Africa M. van der Merwe --- Department of Zoology and Entomology, South AfricaThe incidence of torpor during summer and winter in response to cold exposure in Mops condylurus was studied in a subtropical environment. Body temperature changes under natural roosting conditions during winter and summer were monitored using bats fitted with temperature-sensitive... -
Zonation of benthic communities on the subtropical Aliwal Shoal, Durban, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: J. M. Olbers --- Ezemvelo KwaZulu-Natal Wildlife, South Africa L. Celliers --- Oceanographic Research Institute, South Africa M. H. Schleyer --- Oceanographic Research Institute, South AfricaAliwal Shoal is a subtropical, algal-dominated reef in a marine protected area located south of Durban, South Africa. The shoal has historically been heavily utilized by fishermen and SCUBA divers. In this study, a survey was undertaken to describe and... -
Contrasting hydrography and phytoplankton distribution in the upper layers of cyclonic eddies in the Mozambique Basin and Mozambique Channel
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa RG Barlow --- Marine Research Institute and Department of Oceanography, South AfricaHydrographic data collected in cyclonic eddies in the Mozambique Channel and Basin revealed notable differences in temperature and salinity at a depth of 100 m, the upper mixed layer, the nitracline depths, and vertical distribution of chlorophyll-a (Chl-a). Differences in... -
Long-term effects of pig slurry application on selected soil quality parameters and tissue composition of maize in a subhumid subtropical environment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tichaedza J Chikuvire --- School of Agricultural Earth and Environmental Sciences, South Africa Pardon Muchaonyerwa --- School of Agricultural Earth and Environmental Sciences, South Africa Rebecca Zengeni --- School of Agricultural Earth and Environmental Sciences, South AfricaEffects of long-term application of pig slurry (PS) on soil organic carbon (SOC) pools, nutrients and maize tissue composition under continuous conventional tillage in a maize–soyabean rotation system in subhumid subtropical environments are unclear. The soil and plant parameters have... -
Topo-edaphic environment and forest plantation disturbance explain patterns of grassland species richness, composition and structure in an agro-ecological landscape, Maputaland, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AP Starke --- , South Africa TG O’Connor --- , South Africa CS Everson --- , South AfricaGrasslands of the Maputaland coastal plain are biologically diverse and provide a variety of ecosystems services. Yet grasslands in this region are vulnerable to continuing development by plantation forestry that provides economic benefits to local communities. In order to provide...