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The interaction between salinity and nutrient solution temperatures

A large number of studies on salinity in hydroponic systems have been carried out, but few of them have evaluated the interaction between salinity and nutrient solution temperatures. In Brazil, two experiments were carried out in a randomized block design from January to February (Experiment I) and June to July 2018 (Experiment II).

Experiment I consisted of treatments with five combinations, as follows: unheated (control) and heated nutrient solution (NS) at a temperature of 32°C using fresh water with an electrical conductivity (ECw) of 0.3 dS m−1, and unheated and heated NS at temperatures of 30 and 32°C using brackish water with an ECw of 6.5 dS m−1 in the main plots, with two coriander cultivars (Tabocas and Verdão) in the subplots, which were grown in the same hydroponic channel. The cultivar Verdão was grown in Experiment II in a 2 × 2 factorial arrangement, consisting of two NS temperatures (unheated and heated at 30°C) and two ECw levels (0.3 and 6.5 dS m−1).

“Coriander cultivation is feasible with heated NS despite decreases in shoot fresh matter production compared to the control of approximately 37% for Experiment I (cultivar Verdão at a temperature of 32°C and using fresh water) and 17% for Experiment II (temperature of 30°C and using fresh and brackish waters) at 25 days after transplanting,” the researchers conclude.

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Priva Middle East team has been in Qatar

Over the past few days, the Priva Middle East team has been in Qatar. Together with colleague Jan Westra from the Netherlands, our GM Giovanni A. visited various knowledge institutes, government entities and the well-known QTFA farm.

The trip, co-organised by Heba leith from the Netherlands Embassy in Qatar, included a visit to Hassad Food, Qatar’s premier investor in the food and agri-business sectors, and the Ministry of Municipality. During these visits, our Priva team discussed potential collaborations including the opportunity to jointly form an eco-system to achieve the set goals of Qatar’s food security strategy.

To build a robust food security strategy, Qatar has outlined its focus on four pillars:

1. Ensure that trade routes are diversified so that risk-exposure is limited and a contingency plan for alternative routes as needed;
2. Move food from port, field or reserves to table as efficiently as possible (i.e., limiting food losses/waste), with regulations that foster competition and encourage safety;
3. Put in place adequate but sensible reserve capacity to act as a buffer in time of crisis, both for inputs (water, seeds, fertilizer) and outputs (food products); and
4. Efficiently cultivate crops, meat and fish within the confines of a Qatar’s resource base to ensure a stable source of perishables in times of crisis, as well as providing a regulatory framework that creates incentives to focus on commodities that make sense from a cost-competitiveness point of view.

Source: (former) Qatar Ministry of Municipality & Environment (MME), Qatar Food Strategy 2018-2023.

Jan and Giovanni also met with representatives from Qatar University and the Qatar Environment & Energy Research Institute (QEERI) part of Hamad Bin Khalifa University. QEERI is a national research institute tasked with supporting Qatar in addressing its challenges related to energy, water and the environment. The institute’s work is in line with the goals set forth by Qatar National Vision 2030, and is supported by the Qatar Foundation Research, Development and Innovation.

On Monday, a visit to Arab Qatari Agricultural Production Company (QTFA) was on the agenda. Established in 1989, QTFA is considered the largest agricultural farm in Qatar. Spanning a total land area of 200 hectares, the farm is divided into open fields and greenhouses (cooled and un-cooled). QTFA produces around 28 types of premium vegetables and among other well-known Dutch companies, Priva’s products are in place at the farm. Senior Agronomist Carol Khadra and Senior Production Supervisor Buddhi Magar very kindly took the time to show our colleagues around the farm and its locally produced crops, including tomatoes and cucumbers.

The trip to Qatar concluded with a luncheon with Dutch Ambassador, H.E. Mrs Marjan Kamstra, Deputy Ambassador, H.E. Tiest Sondaal, Business Developer Gulf Region NL Embassy, Heba leith, and Chairman of the Dutch Business Council Qatar, Robert W. Cats Cats.

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Strawberry substrate production systems: a review by Omafra

Growers have many options when it comes to establishing strawberry substrate production. OMAFRA’s Erica Pate reviews different container options, tabletop and suspended systems, and different structures used for strawberry substrate production.

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Pura Hoja: refrigeration extend the shelf life by 2-6 days

Speaking is Tomás Benavente of Pura Hoja, the largest grower of hydroponic lettuce in Chile: “The time of harvesting must be carefully planned, the product must not be harvested too late. Temperature control is also vital for shelf life. Depending on the crop, the entire cold chain ideally takes place in a room with a temperature between 2-5° C.” 
The thin and narrow shape of the land makes distribution a major complication for hydroponic products. By refrigerating their produce, they can keep the lettuce as fresh as possible before it hits supermarket shelves.

Pura Hoja was founded in 2010. Over the past ten years, the company has grown to become the largest grower of hydroponic lettuce in Chile. They are currently growing lettuce on their NFT system, while also doing trials with herbs and baby vegetables. According to Tomás, the company is technologically capable of growing any green leafy vegetable in their greenhouse. He believes there is a great opportunity for the horticultural sector to become more efficient through the use of technology, but the market must also appreciate these products.

Tomás: “Growing a healthy crop all year round is a major challenge. Technologies that regulate the climate, disinfection and disinfection, fertilization and crop management are extremely important. With these techniques we can control all climatic conditions in the area. .”

Since this technology is not easy to manage and also expensive, the market has to appreciate the added value of the hydroponic products. And that is why the lettuce must be of impeccable quality when it reaches the consumer. The Pura Hoja lettuce is sold on the national market, mainly through the retail channels. “The time of harvesting has to be carefully planned, because the lettuce should not be too old. Then temperature control is crucial.”


For extra shelf life, Pura Hoja has been working with a vacuum cooler for two years now. This cooler, supplied by the Dutch company WeberCooling, helps them keep the lettuce as fresh as possible before it hits supermarket shelves.

Sylvia van Uden of Weber Cooling: “By lowering the pressure in the vacuum chamber, you force (a fraction of) the product’s own moisture to evaporate. This evaporation costs energy, which is extracted from the product in the form of a temperature reduction.” The WeberCooling team is also very active in the American vertical farming market and in Latin America with their technology. Both hydro growers and vertical farmers have opted for the systems because it extends the shelf life of the products. The same goes for Pura Hoja.

Tomás: “The vacuum cooler helps us to lower the temperature very quickly after harvesting, which directly affects the shelf life of the product. After harvesting, we cool the products for at least 20 minutes. This process allows us to extend the shelf life by at least 2-6 days and according to some figures even up to 10 days.This way we deliver healthy lettuce with maximum freshness to our consumers.”

For more information:
Pura Hoja
Valparaiso / Chile


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