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25 February 2019 | Story Ruan Bruwer
Tharina van der Walt
The hammer thrower Tharina van der Walt is one of several first-class athletes among the first-year students at Kovsies this year. She is the South African U18 champ and record-holder in 2018.

Several top athletes, some of whom were the very best in the country in their respective events at school, have joined Kovsies as first-year students. They already had their first taste of glory as Kovsies when they recently won their events at the first-year meeting.
 
Among these first-years are Jannes Schlebusch (javelin thrower), Joviale Mbisha (sprinter), Colette Uys (discus/shot-put), and Tharina van der Walt (hammer thrower), who have all represented South Africa in the past two years.
 
Schlebusch won the silver medal at the World U18 championships in 2017, but was injured last year. Great things were expected for 2019, but during the first-year meeting he injured his ankle to such an extent that he will have to undergo an operation that would put him on the sideline for the rest of the season.
 
Van der Walt was the South African schools champ in the hammer throw for girls U19 in 2018, when she managed to set up a new school record of 57,83 m. She was ranked fourth at the World U18 champs in 2017. At the same meeting, Mbisha ended 14th in the 100 m.
 
Uys, who participated in the CAA Southern Region Youth and Junior Championships last year, achieved a second place in the discus at the 2018 National Secondary Schools Championships for girls U19. Other first-years who took part in the SA’s last year, are Vicky Oelofse (1 500 m) and Michael Skosana (long jump).
 
They will strengthen Kovsie Athletics, which already boasts a large group of athletes with international experience. Of the 16 athletes who participated internationally last year, only Kesa Molotsane and Lara Orrock will not be in action for the students again.
 
■ Imperium Residence won the men’s division and Arista/Amelia were the ladies’ winners.
 

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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