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Production Capacity of Softwood Sawmills in the Republic of South Africa, Swaziland and Transkei
Item type: Journal Article • Journal: South African Forestry Journal • Authors: N. van der Merwe --- Council for Scientific and Industrial Research, South Africa H. Riekert --- Council for Scientific and Industrial Research, South AfricaThe technical and practical capacities of softwood sawmills and boxmills in the Republics of South Africa, Transkei and Ciskei and the Kingdom of Swaziland were estimated as at 30 June 1987. These estimates show that sawmills in Southern Africa are... -
Use of the microwave oven for drying herbage samples in the field
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Daines --- Department of Agriculture, Republic of South Africa R.A. Ingpen --- , Republic of South AfricaDrying of herbage samples in the field using a microwave oven powered by a portable generator has saved time and eliminated the transporting of samples to other stations for handling. Microwave drying is compared to drying in conventional forced-air ovens... -
Changes in soil aggregate stability during simulated weather cycles
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.B. Molope --- Geography Department,The effects of wetting and drying, and freezing and thawing on the stability of aggregates produced by laboratory manipulation or field tillage were studied on two British soils. Changes in aggregate stability were assessed by turbidimetry, with some information from... -
Effects of sample drying temperature on indices of available nitrogen in soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South Africa C.C. du Preez --- Department of Soil Science, Republic of South AfricaDuring a field trial investigation into the long-term effects of conservation practices on the nitrogen fertility of a soil cropped annually to wheat, it was observed that sample preparation had an effect on some indices of available nitrogen. The trial... -
The effect of oven-drying on residual inorganic nitrogen in soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South Africa C.C. du Preez --- Department of Soil Science, Republic of South AfricaResidual ammonium nitrogen in soils which were dried in an oven increased, whereas residual nitrate nitrogen remained almost constant. This observation led to experiments which help to explain the accumulation of ammonium nitrogen in oven-dried soils. It was found that... -
CRITICAL POINT DRYING AS A PREPARATIVE TECHNIQUE FOR SCANNING ELECTRON MICROSCOPY AND ITS APPLICATION IN LIMNOLOGY
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R. H.M. Cross --- , South Africa B.R. Allanson --- , South Africa B.R. Davies --- , South Africa C. Howard-Williams --- , South AfricaThe preservation technique of critical point drying for use with the scanning electron microscope is described. A study of the periphyton community development on the aquatic macrophyte, Potamogeton pectinatus L. from the littoral zone of Swartvlei, southern Cape Province, is... -
Effect of different herbage preservation methods on the tannin levels monitored in Eulalia villosa Thunb. (Nees)
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: E.W. du Toit --- , Republic of South Africa M.M. Wolfson --- , Republic of South AfricaTannin concentrations in freeze‐, oven‐ and room‐temperature‐dried samples of leaves of Eulalia villosa Thunb. (Nees), as well as undried material stored at ‐70°C, were determined in order to compare the effect of different preservation methods on the tannin levels measured... -
Solar drying research of medicinal and aromatic plants: An African experience with assessment of the economic and environmental impact.
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Macmanus Chinenye Ndukwu --- , Nigeria Merlin Simo-Tagne --- , France Lyes Bennamoun --- , CanadaPerformances of solar dryers for the drying of medicinal and aromatic plants (MAP) in Africa were reviewed. Policy formulation indicators, including the economic and the environmental impact analysis that was lacking in almost all research, were presented in this study... -
Low constant temperature drying can be a satisfactory method to determinethe moisture content of impermeable seed coated species
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ganesh K Jaganathan --- University of Shanghai for Science and Technology, China Jiajin Li --- University of Shanghai for Science and Technology, China Baolin Liu --- University of Shanghai for Science and Technology, ChinaThe International Seed Testing Association (ISTA) recommends two methods for seed moisture content determination: high constant temperature drying, carried out at 130 °C for 1, 2, 3 or 4 hours, and low constant temperature drying, carried out at 103 °C... -
Predictive modelling to determine the attainable moisture content of Alstonia boonei wood using a solar kiln dryer
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Joy Aduralere Ogunsuyi --- Federal University of Technology Akure (FUTA), Nigeria Jacob Mayowa Owoyemi --- Federal University of Technology Akure (FUTA), Nigeria Olusola Samuel Makinde --- Federal University of Technology Akure (FUTA), NigeriaModelling of wood drying is important for predicting the performance and efficiency of solar dryers and to optimise the drying process during each season of the year. The attainable moisture content (MC) of Alstonia boonei wood was studied when dried...