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17 December 2018 | Story Andre Grobler | Photo Supplied
Drought read more
Water-saving initiatives have been implemented throughout the university’s campuses to withstand the drought.

An attentive visitor to the University of the Free State (UFS) would have noticed that in the past year, certain parts of the Bloemfontein Campus’ gardens have undergone a change. This is part of the UFS’s water-wise and grey-water initiatives that are a response to the ongoing local drought conditions and water restrictions.

Waterless gardens

Senior Director: University Estates, Nico Janse van Rensburg, says the environmental conditions have had a severe impact on the appearance of the gardens. “The era where we had big lawns, has passed.”

Janse van Rensburg says the UFS decided to start the initiative at two highly visible areas, two traffic circles, one at the George du Toit Building and the other the Francois Retief Building.

More landscape changes can be seen in the gardens around the Biotechnology Building, Geography building and Muller Potgieter Building, as well as near the Institute for Groundwater Studies, Engineering Science and the Thakaneng Bridge.

Towards an energy-efficient environment

Paving in these areas is designed to allow for water to soak into the ground. Acting Grounds Services Manager, De Wet Dimo, says more than 100 indigenous trees, which are more adaptive to local environmental conditions, have also been planted. He says a new wood chipper which was recently purchased, will turn dead trees in gardens into wood chips to be used as mulch for new plants.

Dimo says the new look and feel of the gardens was created by using hard elements, paving and indigenous succulents.

New student residences, including those in Qwaqwa and South Campus will use a grey-water system using water which will be collected from showers and basins. The piping at two older residences on the Bloemfontein Campus has also been renovated to a two-way system.

“Rainwater harvesting systems have been fitted at all residences and academic buildings,” said Dimo. The 19 tanks that have been installed have a storage capacity of 265 kilolitres.  Janse van Rensburg says other water-wise initiatives that have been put into action include installing waterless urinals in administrative and academic buildings, water restrainers, pressure control systems (reducing the volume of water) and push-button systems instead of taps.

News Archive

Sunflowers are satellite dishes for sunshine, or are they?
2016-07-20

Eighty-six percent of South Africa’s
sunflowers are produced in the
Free State and North West provinces.

Helen Mirren, the English actress, said “the sunflower is like a satellite dish for sunshine”. However, researchers at the University of the Free State (UFS) have found that too much of this sunshine could have a negative effect on the growth of sunflowers, which are a major source of oil in South Africa.

According to Dr Gert Ceronio from the Department of Soil, Crop, and Climate Sciences at the UFS, extremely high soil temperatures play a definite role in the sprouting of sunflower seedlings. Together with Lize Henning, professional officer in the department, and Dr André Nel from the Agricultural Research Council, he is doing research on biotic and abiotic factors that could have an impact on sunflowers.

Description: Sonneblom 2 Tags: Sonneblom 2

Various degrees of deformity (bad-left
to none-right) in seedlings of the same
cultivar at very high soil temperatures.
Photo: Dr Gert Ceronio

Impact of high temperatures on sunflower production

The Free State and North West provinces, which produce 86% of South Africa’s sunflowers, are afflicted especially by high summer temperatures that lead to extremely high soil temperatures.

Dr Ceronio says: “Although sunflower seeds are able to germinate at temperatures from as low as 4°C to as high as 41°C, soil temperatures of 35°C and higher could have a negative effect on the vegetative faculty of sunflower seedlings, and could have an adverse effect on the percentage of sunflowers that germinate. From the end of November until mid-January, this is a common phenomenon in the sandy soil of the Free State and North West provinces. Soil temperatures can easily exceed the critical temperature of 43°C, which can lead to poor germination and even the replanting of sunflowers.”

Since temperature have a huge impact not only on the germination of sunflower seeds, but also on the vegetative faculty and sprouting of sunflower seedlings, Dr Ceronio suggests that sunflowers should be planted in soil with soil temperatures of 22 to 30°C. Planting is usually done in October and early November. Unfortunately, this is not always possible, as soil moisture is not optimal for growth. Farmers are then compelled to plant sunflowers later.

Impact of herbicides on sunflower growth

“High soil temperatures, combined with the herbicide sensitivity of some cultivars, could lead to the poor development of seedlings," says Dr Ceronio.

The use of herbicides, such as ALACHLOR, for the control of weeds in sunflowers is common practice in sunflower production. It has already been determined that ALACHLOR could still have a damaging effect on the seedlings of some cultivars during germination and sprouting, even at recommended application dosages.

“The purpose of the continued research is to establish the sensitivity of sunflower cultivars to ALACHLOR when exposed to high soil temperatures,” says Dr Ceronio.

 

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