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06 March 2019 | Story Ruan Bruwer | Photo Varsity Sports
Tharina van der Walt
Tharina van der Walt, a first-year student, won the hammer-throw item at the first Varsity Athletics meeting in Stellenbosch on Friday – the only gold medal for the Kovsies.

Hammer thrower Tharina van der Walt was the bright spark for the University of the Free State (UFS) at the first Varsity Athletics meeting in Stellenbosch on Friday.

Van der Walt, who recently turned 19 and is one of three first-year students in the UFS team of 25 athletes, bagged the only gold medal for the Free State students. She won the hammer throw with a distance of 53,12 m.

The UFS ended in fourth place behind NWU (first), UJ (second), and Tuks (third).

Six athletes achieved second places. Both Sokwakana Mogwasi (100 m) and Ts’epang Sello (800 m) came within a whisker of claiming victory.  Mogwasi lost the 100 m by 00:04 seconds, but in the process improved her personal best from 11,89 to 11,58. Sello (2:08,47) was in the lead for most of the 800 m but was eventually defeated by Niene Muller of Tuks by less than half a second.

Mogwasi was also second in the 200 m with a fast 24,92. Other silver medals were obtained by Yolandi Stander in the discus (52,70 m), Peter Makgato in the long jump (7,66 m), and Marné Mentz in a very fast 1500 m race. Mentz (04:26,63) chopped more than five seconds off her previous best time of 4:32,00. Her time was the third fastest ever in the 1 500 m at Varsity Athletics.

There were three third places: Sefako Mokhosoa (15,47 – triple jump), Petrus Jacobs (14,55 – 110 m hurdles), and the women’s 4x100 m relay team (Mogwasi, Elsabé du Plessis, Joviale Mbisha, and Micháela Wright).

Four athletes just missed out on podium positions, achieving fourth places.

The second Varsity athletics meeting will take place in Potchefstroom on 15 March 2019.

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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