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05 November 2020 | Story Thabo Kessah
Prof Moffett’s latest offering collates hundreds of mountain research material into one accessible reference book.

Prof Rodney Moffett recently published a new book focusing on various scientific articles published between 1808 and 2019. The book, A Scientific Bibliography of the Drakensberg, Maloti and Adjacent Lowlands, has 534 pages and covers material appearing in accredited journals, plus unpublished but traceable reports, documents, presentations, and dissertations.

“The scientific articles range from palaeobotany with 17 entries, to rock art with 502 entries, as well as 252 theses and dissertations,” said Prof Moffett.

He said it took 18 months to compile the book, typing the manuscript himself – mostly at night.

In the foreword, Dr Ralph Clark, Director: Afromontane Research Unit (ARU), says: “This bibliography is a labour of love, and will inspire a new generation to take up the baton for excellent research in this fantastic mountain system. We are proud to publish this under the ARU banner as a contribution to growing and consolidating mountain-passionate relationships in Southern Africa, and to encourage our journey towards developing a holistic understanding and sustainable use of these iconic mountain landscapes.” 

Other books

Prof Moffett is an honorary research fellow in the Department of Plant Sciences at the University of the Free State, and an associate of the Afromontane Research Unit on the UFS Qwaqwa Campus. He was previously Professor of Botany on the Qwaqwa Campus when it was part of the University of the North, retiring in 2000. Since then, he has remained active, publishing scholarly works on ethnobotany and other natural history subjects.

His four recent books, also published by Sun Press, are: Sesotho Plant and Animal Names and Plants used by the Basotho (2010), A Biographical Dictionary of Contributors to the Natural History of the Free State and Lesotho (2014), Basotho Medicinal Plants – Meriana ya Dimela tsa Basotho (2016), and A Field Guide to the Clarens Village Conservancy (2018). A second revised edition of Meriana ya Dimela tsa Basotho – 

News Archive

Research helps farmers save with irrigation
2017-02-15

Description: Irrigation research Tags: Irrigation research

Marcill Venter, lecturer in the Department of
Agricultural Economics at the University of the
Free State, has developed the mathematical
programming system, Soil Water Irrigation
Planning and Energy Management in order to
determine irrigation pump hours.
Photo: Rulanzen Martin

Her advice to farmers is that they should make sure they are aware of the total cost (investment and operating costs) of an irrigation system. In most cases the investment cost is low, but the operating cost over the lifetime of the system is high.

“It is very important to have a look at the total cost and to install the most economic system,” says Marcill Venter, lecturer at the University of the Free State (UFS), who has done research on the economic sustainability of water-pipe systems.

Irrigation systems important components for farming
This research comes at a time when many farmers are relying on their irrigation systems due to persistent drought and low rainfall during 2016. South Africa has also experienced an abnormal increase in electricity tariffs in recent years. Due to tariff increases which threaten the future profitability of irrigation producers, the Water Research Commission (WRC) has launched and financed a project on the sustainable management of irrigation farming systems. “I had the opportunity to work on the project as a researcher,” says Venter.

The heart of every irrigation system is the water pipes that bring life to crops and livestock, and this is what Venter’s research is about. “Water pipes are part of the whole design of irrigation systems. The design of the system impact certain factors which determine the investment and operating costs,” she says.

Mathematical system to help farmers
Venter and Professor Bennie Grové, also from the Department of Agricultural Economics at the UFS, designed the Soil Water Irrigation Planning and Energy Management (SWIP-E) programming model as part of the WRC’s project, as well as for her master’s degree. “The model determines irrigation pump hours through a daily groundwater budget, while also taking into account the time-of-use electricity tariff structure and change in kilowatt requirements arising from the main-line design,” says Venter. The model is a non-linear programming model programmed in General Algebraic Modeling System (GAMS).

Design of irrigation system important for sustainability

The main outcome of the study is that the time-of-use electricity tariff structure (Ruraflex) is always more profitable than the flat-rate structure (Landrate). The interaction between the management and design of a system is crucial, as it determines the investment and operating costs. Irrigation designers should take the investment and operating cost of a system into account during the design process. The standards set by the South African Irrigation Institute (SAII) should also be controlled and revised.

Water-pipe thickness plays major role in cost cuts
There is interaction between water-pipe thickness, investment and operating costs. When thinner water pipes are installed, it increases the friction in the system as well as the kilowatt usage. A high kilowatt increases the operating cost, but the use of thinner water pipes lowers the investment cost. Thicker water pipes therefore lower the friction and the kilowatt requirements, which leads to lower operating costs, but thicker pipes have a higher investment cost. “It is thus crucial to look at the total cost (operating and investment cost) when investing in a new system. Farmers should invest in the system with the lowest total cost,” says Venter.

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