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06 March 2020 | Story Igno van Niekerk | Photo Igno van Niekerk
 Gert Marais looking at pecan leave_
Dr Gert Marais says the UFS is helping to ensure that the pecan industry not only survives but thrives.

“When opportunity knocks, you must jump. The more opportunity knocks, the more you should jump.” 

Look closely, and you will notice the rise in pecan-nut plantations as you travel through South Africa. Do not be surprised if you find that the UFS’s pecan-nut project – steered by Dr Gert Marais, Senior Lecturer in the Department of Plant Sciences – is associated with those pecans.

Main exporter
In an ever expanding and interconnected global economy, South Africa has joined the USA as main exporters of pecan nuts to China. We have several advantages; our seasons differ from that of the USA, and we have the benefit that we are harvesting and exporting pecan nuts at the time when they are most popular at Chinese festivals and events.

Although it takes a long time to grow pecan trees (seven to eight years before they start producing), the long wait has extensive benefits. Dr Marias explains: “Unlike other crops, you do not have to prepare the soil and plant new crops annually. Rather than re-investing, you only need to do proper maintenance. Once planted, the pecan trees can produce for generations to come. And the UFS is involved in ensuring that the pecan industry not only survives but thrives.”

Empowering farmers
As the pecan industry in South Africa grows, new challenges are identified. Some trees suffer from a condition called overall decline, others from scab, and some others are infested by combinations of fungi not found in other countries. Dr Marais and his team have filed several ‘first reports’ of combinations between pecans and pathogens, leading to opportunities for MSc research projects and making a difference in the industry.

Dr Marais undertakes six field trips per year to visit all the production areas in South Africa, share information at farmer’s days, arrange courses to ensure best practices with regard to pecan cultivation; students also use these visits to collect samples for their research. Due to the systemic collaboration between the private sector and the university, farmers are empowered to manage their pecan crops better, the university benefits from cutting-edge research, and South Africa becomes a stronger player in the international economy.

Opportunity is knocking. And the UFS is jumping.

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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