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A model for predicting livemass gain from stocking rate and annual rainfall
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.I. Bransby --- Department of Grassland Science,The relationship between livemass gain and stocking rate was established for young beef animals grazing kikuyu and Coastcross II pastures in each of five grazing seasons. The annual rainfall within these seasons ranged from 506 mm to 990 mm. Relationships... -
A model for predicting long term economic optimum stocking rates for beef cattle grazing dryland pastures
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.I. Bransby --- Department of Grassland Science,Previous models relating profit to stocking rate have not taken into account annual variation in rainfall. A model is developed here to allow for this factor. The frequency distribution of annual rainfall is used to demonstrate how the stocking rate... -
Variation in important pasture grasses. II. Cytogenetic and reproductive variation
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.J. Spies --- Department of Agriculture and Water Supply, G.E. Gibbs Russell --- Department of Agriculture and Water Supply,The chromosome numbers and reproductive variation of seven important pasture grasses from South Africa are compared. This comparison indicates that all these species form polyploid complexes, all reproduce both sexually and either apomictically or vegetatively, and some form of hybridization... -
The value of subtropical grass pastures for use as foggage on the eastern Transvaal Highveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.F.G. Rethman --- , Republic of South Africa C.C. de Witt --- , Republic of South AfricaThe utilization of frosted herbage of Pennisetwn clandestinwn, Paspalum notation, Digitaria eriantha, Cynodon sp. and Chloris gayana by Merino wethers during the winter confirmed the potential of this practice as an alternative winter feeding strategy under Highveld conditions. P. clandestinwn... -
The yield potential and crude protein content of five rhizomatous and stoloniferous grass pastures in the escarpment areas of the eastern Transvaal
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. F.G. Rethman --- Athole Research Station, Department of Agriculture & Water Supply, Republic of South Africa C. C. de Witt --- Athole Research Station, Department of Agriculture & Water Supply, Republic of South AfricaWhilst Cynodon aethiopicus and the Cynodon hybrid, ‘Coast Cross II’, proved to be unsuited to the cool high rainfall conditions, Acroceras macrum, Pennisetum clandestinum and Digitarla scalarum were well adapted. There was little difference in yield potential between local and... -
Efficacy of glyphosate, alternative post-emergence herbicides and tillage for control of Cynodon dactylon
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: PL Campbell --- , Republic of South AfricaCynodon dactylon (L.) Pers (cynodon) is a major weed in the South African sugarcane industry. Current recommendations involve repeated application of glyphosate for prolonged control. This paper describes three trials of a study to identify alternative treatments. Trial 1 screened... -
Image analysis to quantify herbicide efficacy for Cynodon dactylon control
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.L. Campbell --- , Republic of South Africa M.T. Smith --- , Republic of South Africa C. Sewpersad --- , Republic of South Africa M. van den Berg --- , Republic of South AfricaStudies on the effectiveness of herbicides for control of Cynodon dactylon (L.) Pers. (cynodon) normally rely on visual recording methods, which are rapid and convenient, but lack objectiveness and reproducibility. To address this problem, a computer software package was customized... -
BATHYMETRIC STUDIES ON THE PONGOLO RIVER FLOODPLAIN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: C.M. Breen --- Pongolo River Research Group, Departments of Botany, South Africa H.D. Furness --- Pongolo River Research Group, Departments of Botany, South Africa J. Heeg --- Pongolo River Research Group, Departments of Zoology, South Africa J. Kok --- Pongolo River Research Group, Departments of Zoology, South AfricaThirteen of the major pans on the Pongolo river floodplain have been studied. Most are shallow (>2.5 m) and regularly lose up to 70% of their water each year, although few dry out. Floods inundate considerable areas (1000 ha) around... -
The nutritional value of Zizyphus spina-christi for goat production among the pastoralists of Kalu district, South Wello, Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KY Dawd NKR Musimba WN Ekaya KO FarahFifteen yearling goats of similar weight were used to evaluate the potential of Zizyphus spina-christi leaves as a supplement to goats fed on Cynodon dactylon grass. Animals were randomly assigned to five feeding regimes and individually stall-fed for a preliminary... -
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... -
Weed management in sugarcane using a combination of imazapyr followed by velvet bean as a break crop
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Peta L Campbell --- South African Sugarcane Research Institute, South Africa Richard P Beckett --- School of Life Sciences, South Africa Graeme W Leslie --- Simbithi Estate, South AfricaWhile farmers have used glyphosate to control the growth of weeds such as Cynodon dactylon (cynodon) in sugarcane fields for many years, its use has problems which include poor persistence in the soil and the development of tolerance. Here the... -
The potential use of a water treatment residue as a temporary growth medium over a coal combustion ash: yield response of two creeping grasses
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.W. Titshali --- Soil Science, School of Environmental Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209,, South Africa J.C. Hughes --- Soil Science, School of Environmental Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209,, South AfricaRecent research has indicated the potential for recovery of aluminium from alumina-rich coal-combustion ashes (CCA). However, the ash disposal sites, if not vegetated, often present environmental risks due to water and air-borne dispersal of contaminants. This study investigated the potential...