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The success of the AMMI model in predicting lucerne yields for cultivars with differing dormancy characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MarieF. Smith --- , Republic of South Africa A. Smith --- , Republic of South AfricaThe AMMI model, which incorporates both additive and multiplicative components into an integrated, powerful, least squares analysis, is used for the analysis of cultivar trials at different localities. These trials are a major experimental component in crop production and plant... -
Genotype × environment interaction of winter wheat (Triticum aestivum L.) in South Africa: I. AMMI analysis of yield performance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.L. Purchase --- , Republic of South Africa Hesta Hatting --- , Republic of South Africa C.S. van Deventer --- Department of Plant Breeding, Republic of South AfricaThirteen winter and intermediate type bread wheat cultivars were evaluated under dryland conditions over a four year period from 1991 to 1994 and over 120 environments in the Free State province of South Africa. The Additive Main Effects and Multiplicative... -
Genotype × environment interaction of winter wheat (Triticum aestivum L.) in South Africa: II. Stability analysis of yield performance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.L. Purchase --- , Republic of South Africa Hesta Hatting --- , Republic of South Africa C.S. van Deventer --- Department of Plant Breeding, Republic of South AfricaThirteen winter and intermediate type bread wheat cultivars were evaluated for yield stability under dryland conditions over a four year period from 1991 to 1994 and over a total of 120 environments in the Western, Central and Eastern Free State... -
Evaluation of sorghum hybrids for resistance to the root rot complex
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.W. McLaren --- , South AfricaSeventy-one sorghum hybrids were evaluated for root rot resistance at Bethlehem and Potchefstroom, South Africa, from 1995/96 to 1998/99. Mean root rot severity ranged from 30.3% in PAN8494 to 41.3% in PAN8061 and root rot severity of hybrids differed significantly... -
Stability analysis of kernel and milling characteristics in winter and facultative wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: U. Aucamp --- Department of Plant Sciences, South Africa M.T. Labuschagne --- Department of Plant Sciences, South Africa C.S. van Deventer --- Department of Plant Sciences, South AfricaConsistency in quality of wheat grain and flour over seasons is critical to the manufacture of high quality products. The aim of this study was to measure the stability of kernel and milling quality characteristics. Thirteen hard red winter and... -
Additive mean effects and multiplicative interaction analysis of maize yield trials in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S. H. Ma’ali --- , South AfricaThirty five maize hybrids were evaluated over 98 environments for genotype x environment interaction (GEI) and yield stability under dry land conditions during the 2003 to 2006 seasons in the eastern and western maize production regions of South Africa. The... -
Sugarcane cultivar x time of harvest interactions in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S. Ramburan --- , South AfricaThe adaptability of new sugarcane (Saccharum spp.) cultivars to time of harvest (TOH), and reasons for yield variability between harvest times are currently unclear in South Africa. The objectives of this study were to evaluate the adaptability of commercial cultivars... -
Wood supply and forest regeneration consequences of integrated log allocation in western Kenya
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: GilbertO. Ototo DonaldO. OgwenoThe present system of log sales from softwood plantations in Kenya is by stumpage to single product mills. This harvesting system leads to pulping of large diameter logs while allocation of small diameter logs to sawmills is a major cause... -
Optimising Nursery Operation Schedules with Multiperiod Linear Programming
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: RudolfJanse van Rensburg --- Department of Forest Science, South Africa BrianV. Bredenkamp --- Department of Forest Science, South AfricaA dynamic multiperiod linear programming model which addresses nursery scheduling is presented. Due to its dynamic nature, it provides a means to manage risks and uncertainties such as disease, rootstrike, germination and fluctuating demands. By optimising the whole production process,... -
The Structure of Cellulose by Conformational Analysis.
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. Pizzi --- , N. Eaton --- ,Conformational analysis studies on the tertiary structure of cellobiose and methyl-β-cellobioside were carried out by using calculations of Van der Waals, H-bond, electrostatic and torsional energy interactions between the atoms and groups of the molecules. Energy maps in function of... -
The Structure of Cellulose by Conformational Analysis.
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. Pizzi --- Council for Scientific and Industrial Research, South Africa N. Eaton --- Council for Scientific and Industrial Research, South AfricaThe Meyer/Misch and related models were found to be the most energetically stable for the crystalline structure of cellulose I. The cellobioside structure is the monomer of cellulose I as structures having cellobiose as monomer have been proven to be... -
Genotype × environment interactions and yield stability of stress-tolerant open-pollinated maize varieties in the Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Vimbayi GP Chimonyo --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Charles S Mutengwa --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Cornelius Chiduza --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaGenotype × environment interactions are inherent in multilocational trials and complicate identification of superior genotypes. The aim of the study was to determine yield performance and stability of 13 maize genotypes in five locations of the Eastern Cape province, South... -
Determining optimal primary sawing and ripping machine settings in the wood manufacturing chain
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Berndt G Lindner --- Department of Industrial Engineering, South Africa PJ Vlok --- Department of Industrial Engineering, South Africa C Brand Wessels --- Department of Forest and Wood Science, South Africafor wood manufacturers around the world, the single biggest cost factor is known to be its raw material. Maximum volume recovery of this raw material is, therefore, of key importance for the industry. The wood products industry consists of several... -
Bringing agile practice to the classroom: Student voices of third-year major project implementation
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Deepak Kumar --- Discipline of Information Systems and Technology, South Africa Irene Govender --- Discipline of Information Systems and Technology, South AfricaAgile practices are the current trend in the software industry, so it is, therefore, pertinent that students not only learn but practise agile development in the learning environment. Adapting to a different approach such as agile practices in software systems... -
Modelling machinery procurement with an emphasis on engineering features
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Basil Olufemi Akinnuli --- Department of Industrial and Production Engineering, NigeriaEngineering features are one of the predominant factors in considering machines for procurement; others are economic and supply conditions. Three major attributes considered under these strategic decisions are engineering features (reliability), economic features (annual operating cost) and supply condition (delivery... -
Genotype-by-environment interaction of grain yield among candidate dryland wheat genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Miriam Matlala --- African Centre for Crop Improvement, South Africa Hussein Shimelis --- African Centre for Crop Improvement, South Africa Jacob Mashilo --- African Centre for Crop Improvement, South AfricaGenotype-by-environment interaction (GEI) analysis is an essential step to identify superior and stable yielding genotypes and suitable test environments for cultivar development. The objective of the present study was to examine GEI of grain yield among candidate dryland wheat genotypes... -
Performance comparison between genetic programming and sediment rating curve for suspended sediment prediction
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Adesoji Tunbosun Jaiyeola --- Faculty of Engineering, Department of Civil Engineering and Surveying, South Africa Josiah Adeyemo --- University of Washington, United States of AmericaThe accurate prediction of suspended sediment flowing into reservoirs is very important during their design and operation stage. It is also of great significance in environmental engineering, hydroelectric equipment longevity, river aesthetics, pollution and channel navigability. Hence the development of... -
Evaluating DoS jamming attack on reactive routing protocol in wireless sensor networks
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Opeyemi A. Osanaiye --- Nile University of Nigeria, Nigeria Olayinka O. Ogundile --- Tai Solarin University, Nigeria Folayo Aina --- University of Central Lancashire, UKWireless sensor networks (WSNs) over the years have emerged as the enabling underlining infrastructure for new wireless technology trends such as Internet-of Things (IoT) and Fog Computing. Its application has spread across diverse fields such as agriculture, military, healthcare and... -
The adoption of Software Engineering practices in a Scrum environment
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Oluwaseun Alexander Dada --- , Finland Ismaila Temitayo Sanusi --- , FinlandThe competition in the software market demands that the time required for any software product to reach the market be reduced if the product is to survive competition from other developers. The pursuit of this goal has led to the...