Sunshine, seawater and sustainability

Friday, October 28, 2016

In an Australian desert, tomato plants are flourishing.

A recent details this first-in-the-world agricultural system: In a desert in the south of Australia, a 鈥渇uturistic-looking greenhouse鈥 is yielding 15,000 tons of tomatoes per year using sunlight and seawater.

鈥淪eawater is piped 5.5 kilometres from the Spencer Gulf to 鈥 the 20-hectare site in the arid Port Augusta region. A solar-powered desalination plant removes the salt, creating enough fresh water to irrigate 180,000 tomato plants inside the greenhouse,鈥 the report states, noting, 鈥淪corching summer temperatures and dry conditions make the region unsuitable for conventional farming, but the greenhouse is lined with seawater-soaked cardboard to keep the plants cool enough to stay healthy. In winter, solar heating keeps the greenhouse warm.鈥

易胜博官网's Becky Sideman
Professor Becky Sideman

鲍狈贬鈥檚 , sustainable horticulture specialist with researcher with the and professor of sustainable agriculture and food systems in the , weighs in on such innovations in food production.

鈥淭his is a neat project,鈥 she tells 易胜博官网 Today. 鈥淚t is amazing what can be done with solar energy and advanced engineering.鈥

Prior to her arrival at 易胜博官网 in 2004, Sideman worked as a plant geneticist and lettuce breeder with the USDA Agricultural Research Service in California.

Sundrop Farm, New Scientist reports, 鈥渦ses no soil, pesticides, fossil fuels or groundwater. As the demand for fresh water and energy continues to rise, this might be the face of farming in the future.鈥

Sideman is interested in this move to farming without fresh water.听

鈥淨uite a bit of agricultural production already takes place in deserts worldwide because of abundant sunshine and low humidity, but I鈥檓 particularly intrigued by the desalination in this case,鈥 she says. 鈥淚 imagine that accessibility of fresh water will be a limiting factor for agriculture in the future, and perhaps the implementation of projects like this will help to bring down the costs of desalination.鈥

The report states that in addition to fresh water, no pesticides or soil are used in the process and notes Sundrop is planning to expand its sustainable greenhouses to Portugal and the U.S.

Sideman points out there are questions still to be answered.

鈥淭he article mentions that this system uses no fossil fuels, but I wonder about the source of fertilizers that the crops need, as well as transportation of the product to market,鈥 she says. 鈥淚 suspect that the costs of infrastructure are high enough to prevent widespread adoption of these techniques in the near future, especially when we can grow crops in a much less energy-intense manner. Still, I will be interested to follow the project as it expands.鈥

Photographer: 
Peter Welch | 易胜博官网