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Horticulture

This collaboration has meant not only increased food security but also a more sustainable livelihood.

In Bomet County located in the Rift Valley region of Kenya, Hellen Rono is already preparing her farm for the new planting season

After a successful tomato harvest, which seemed improbable just a year ago, she is optimistic about her future crops. Like many farmers in the region, Hellen had traditionally depended on rainwater, but it was never enough for her commercial ambitions. The cold climate added to the challenge, prompting her to invest in a greenhouse. She believed it was the solution to her problems, but her first attempt ended in disaster.

“I planted tomatoes inside my greenhouse, which is eight metres by 15 metres, and they started germinating and growing well. However, midway through the growth process, the tomatoes began withering one by one, just as they were about to flower,” Hellen said. The withering continued until nearly 10 plants were dying each day.

Instead of giving up, Hellen reached out to agricultural officers who confirmed the plants were infected with tomato wilt. “We were told that there was no medicine for the disease. They advised us to irrigate the plants with plenty of water to prevent further withering,” she explains. With her farm relying on Bomet County water for both domestic and agricultural use, Hellen's water bill soared as she was using around 200 litres per day to irrigate the tomatoes. Despite the increased irrigation, her greenhouse remained flooded, but the damage was done—by the time some plants began to fruit, the entire crop had withered. There was nothing to harvest.

This setback led Hellen to research tomato wilt online, where she discovered tomato grafting, a technique from China that combats the disease. She also learned that high temperatures inside her greenhouse were another contributing factor, causing the flowers to drop and halting fruit production. “When scientists supervised my greenhouse, they reported high temperatures. At the time, I could not work inside the greenhouse from as early as 10 am because it was unbearably hot,” Hellen says.

Upon receiving training on how to regulate greenhouse temperatures, Hellen reduced the number of tomato plants from 500 to 250. The results were immediate. “We planted both grafted and non-grafted tomatoes in the same greenhouse. After a month, the non-grafted tomatoes started withering, while the grafted ones flowered consistently,” she says. “The grafted plants were not infected, and they continued to fruit, leading to a bumper harvest.”

Hellen's grafted tomatoes yielded impressive results. “It took 75 days to start harvesting grafted tomatoes, the same as the non-grafted ones. However, the grafted ones lasted much longer, with the first harvest weighing 6.8kg compared to 5.1kg from the non-grafted. The grafted plants reached an incredible 73.2kg, while the non-grafted ones barely made it to 8.7kg before dying.”

Yutao Liu, professor & director of the Confucius Institute at Egerton University, highlights the positive outcomes of using technological innovations in farming. "The graft seedling is resistant to disease, while the normal seedling is not. This is an example of the promising future of agricultural technology, particularly through the partnership between China and Kenya," Liu explains.

The collaboration between Egerton University and Nanjing Agricultural University has seen the establishment of 18 demo sites across Nakuru, Kisumu, Bomet, and Subukia. These sites showcase the grafted tomato variety, which has shown promise with a six-month harvest period per planting season. However, to grow grafted tomatoes, farmers need to have greenhouses.

The China-IFAD South-South and Triangular Cooperation (SSTC) initiative, funded by the Chinese Ministry of Finance, is behind this project, which aims to provide rural youth and farmers with innovative horticultural solutions. Steve Codjo, a regional analyst for China-IFAD SSTC, explains, “South-South cooperation is about knowledge exchange. We wanted something tangible that would serve the smallholder farmers for the long term.”

For farmers like Hellen, this collaboration has meant not only increased food security but also a more sustainable livelihood. This demonstrates that when technology is adapted to local contexts, it can break cycles of agricultural loss and empower rural communities.

Collaborative strategies aim for a resilient Africa that proactively addresses risks. (Image Credit: AU)

In a significant move for public health and environmental sustainability, the African Union-InterAfrican Bureau for Animal Resources (AU-IBAR) and the Africa Centres for Disease Control and Prevention (Africa CDC) have jointly launched two key frameworks: the One Health Zoonotic Disease Prevention and Control Strategy (2025–2030) and the Africa CDC Strategic Framework on Climate Change and Health (2025–2029)

These strategies represent a unified, cross-sectoral approach to combating the intertwined challenges of zoonotic diseases and climate change across the continent.

Speaking at the launch event in Addis Ababa, Huyam Salih, director of AU-IBAR, called for action, urging stakeholders to move beyond mere declarations:“Let us move beyond declarations—now is the time for united, cross-sectoral action. I call on all stakeholders to embrace the One Health Strategy as a continental imperative. Together, we must forge a new era of health security, where animal, human, and environmental health are protected as one. Africa’s resilience depends on it, and our future demands it.”

The strategies were developed through a collaborative and evidence-based process that involved Member States, Regional Economic Communities (RECs), technical partners, and civil society organisations. The overarching goal is to create a resilient Africa that addresses risks proactively rather than reactively.

Raji Tajudeen, the deputy director-general of the Africa Centres for Disease Control and Prevention echoed this sentiment, stressing the urgency of moving from rhetoric to results: “These frameworks are more than strategy documents; they are Africa’s collective commitment to protecting our people, our ecosystems, and our future. We must move from rhetoric to results. The time to act is now, and the responsibility rests with all of us.”

Mekdes Daba, Minister of Health, Ethiopia highlighted the interconnectedness of health, ecosystems, and economies across Africa, stating: “Our health, ecosystems, and economies are deeply intertwined. We cannot protect one without investing in all. This is a call for action, not another declaration.”

With more than 75% of emerging human diseases originating from animals and climate change intensifying health risks, the new frameworks seek to strengthen surveillance, improve early warning systems, and integrate public, animal, and environmental health responses. These strategies offer both a roadmap and a call for decisive, coordinated action for a healthier, more resilient Africa.

OptiDry Compact X integrated at Triflor (tulip). (Image source: Bosman Van Zaal)

Bosman Van Zaal has been realising customised dehumidification solutions for customers since 2015, with their R&D department managing to translate these customised solutions into a series of dehumidifiers that are plug-and-play applicable for a wide range of crops and growing systems

Whether in high-tech climate chambers, growing potted plants or fruiting vegetable crops, the innovative OptiDry dehumidifiers can be implemented seamlessly in any cultivation system. The dehumidifiers used in horticulture typically operate with synthetic refrigerants that contribute significantly to greenhouse gas emissions due to their high GWP (Global Warming Potential), with their sale within Europe planned to be phased out between 1 January 2025 and 1 January 2030.

Low-GWP refrigerants are also currently under fire in Europe due to the fact that these refrigerants contain PFAS. As a result, really only natural refrigerants are future-proof. That leaves only 3 applications: CO2, ammonia and propane. Bosman Van Zaal sees R290 (propane) as the best and most sustainable solution.

The OptiDry series consists of two basic type dehumidifiers:

  • The OptiDry Compact X: Designed to dry air very efficiently and can be easily connected to an existing or new chilled water or freecooling circuit by drycooling or basin water. The X stands for cross flow heat exchanger, which is integrated into the unit. Using this additional heat exchanger saves 30-50% on cooling capacity. It is connected to an outdoor unit (chiller or buffer) and is available in two different versions to suit every growing situation.

  • The OptiDry Advanced DX: As one of the first dehumidifiers to use natural refrigerant R290 (propane), the Optidry Advanced DX offers lower energy consumption compared to synthetic refrigerant models. R290 (propane) is therefore not only highly efficient and environmentally friendly, but also future-proof in contrast to synthetic refrigerants. These units can be easily installed in greenhouses or added to existing plant growth chambers for improved dehumidification.

Some of the notable features of the OptiDry range include compact design, lightweight models, high-efficiency dehumidification capacity, presence of the environmentally friendly and future-proof refrigerant R-290 (propane), availability of airsock, and easy integration and connection to new  or existing chilled water systems.

 

ZALUX’s products will be on display at GreenTech Amsterdam, which is scheduled to take place from 11-13 June this year. (Image source: Adobe Stock)

Drawing on its global proficiency in horticultural science and technology, ZALUX, a member of the German group Trilux (Market Leading Company for Professional Lighting), is delivering a groundbreaking line of LED luminaires that profoundly amplify the growth of crops and plants in horticultural settings

ZALUX develops biologically efficient lighting solutions tailored to flowers’ and fruits’ vegetative and generative growth cycles. 

The harmonious integration of greenhouse design, plant biology, and specialised lighting systems holds the promise of unparalleled crop yields and sustainable agricultural practices. By meticulously considering these factors, ZALUX can tailor a lighting system that meets any grower’s unique needs, ultimately fostering optimal plant growth and unlocking maximum yield potential.

“ZALUX lighting solutions are designed to combine the expertise of our European specialists in protected lighting for demanding and aggressive environments, and the advice of horticultural experts,” said head of farming at ZALUX, Patrick Rüschenbaum. “Compared to conventional lighting technology, you can save up to 60% energy with LED luminaires

ZALUX’s products will be on display at GreenTech Amsterdam, which is scheduled to take place from 11-13 June this year.

For more information, visit: www.zalux.com

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