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Achieving agricultural sustainability through seawater

Even though our planet is called “Earth,” over 70% of its surface is composed of water. Our continued existence depends on this vital resource but it is a staggering fact that only 1% of that water is directly accessible for human use. That is mainly because about 98% of the world’s available water is salty. This means that merely “2% of the Earth’s water is fresh water; but half of it is frozen in the form of glaciers and icebergs,” as Mark Tester, Professor of Bioscience at KAUST and Principal Investigator of the Salt Lab, explains.

The scarcity of fresh water supplies, surface water found in lakes and rivers as well as underground sources, poses a major challenge in the face of a growing world population set to plateau at 9 billion people by 2050. Fresh water is an essential part of our agricultural production infrastructure required to feed ourselves. Indeed, no less than “70% of the water that we use on the planet is used for agriculture. Moreover, 40% of our food is produced under irrigation,” as Prof. Tester outlines.

Global climate change is compounding the problem of water scarcity by altering rainfall patterns, reducing rainfall in previously well watered regions. The already limited supply of fresh water is also increasingly affected by salinity. “It would be wonderful if we could unlock at least a fraction of the rest of the vast amount of the world’s water resources,” as Tester further posits.

“So, in the context of needing to produce 70% more food by 2050, we have to both stop the reduction of yield already suffered from brackish irrigation water, and also unlock some of the other 99% of the water that we’re not able to use at the moment. Both of these things call out for our ability to increase the salinity-tolerance of plants.”

Making Our Current Plants Better

Prof. Mark Tester and his group, as well as other KAUST faculty members’ groups, are actively conducting experimental research in the University’s well-equipped greenhouse to find solutions to tackle our expanding food security challenges.

“We need to raise our ability to increase food supply,” said Tester. “We need innovation in plant science, modern plant breeding (e.g. quantitative genetics) and genetic modification.”

Prof. Tester’s group is primarily focused on studying how salt-tolerant plants are able to survive in harsh environments and then using that knowledge to make less salt-tolerant plants grow better in difficult conditions.

“We are trying to improve plant yields in sub-optimal conditions – where the soil is salty or when the water used to irrigate the plants is salty,” as Prof. Tester clarifies. His group essentially looks at the “naturally occurring variability in plants.”

How are some plants naturally able to better grow in salty water while others are less able to thrive in saline conditions? “I want to know what genes are in those tough plants that are missing from the less tough plants,” said Tester.

A Greenhouse Like No Other

These efforts, combining the observation of naturally occurring variations, the discovery of characterizing genes, and the measuring of the salt tolerance of plants require that KAUST plant scientists be able to grow plants in a controlled environment. These tasks are performed in the KAUST Center for Desert Agriculture (CDA)’s high quality 1600-square-meter greenhouse.

Prof. Mark Tester pointed out a unique feature of the greenhouse: a seawater tank. “We can water plants with seawater in this greenhouse. That’s pretty unusual,” he exclaimed. The filtered seawater greatly facilitates salinity experiments.

Another particular feature of the CDA greenhouse, unique to it’s location in Saudi Arabia, is that the water is actually cooled as it arrives from the desalination plant. This is to prevent the water warming the roots of plants in the soil – roots are used to be in the cooler soil, and are particularly sensitive to being warmed.

Different Approaches to Tackling Abiotic Stress

Given the fact that a quarter of the food that we produce under irrigation is already affected by salinity, a number that is rising rapidly, finding effective ways to use seawater to grow plants is of primary importance.

Prof. Tester recognizes the value of research towards this common sustainable agriculture goal also being conducted by fellow KAUST faculty members such as Prof. Heribert Hirt, who looks at solutions to increase plants’ tolerance to drought and heat, and Prof. Magdy Mahfouz, whose research interests focus on genome-engineering across plant species.

“Together we form a package of different approaches. All the approaches are good. There’s no one right approach. One might be better than another for particular circumstances, but they can all make a valuable contribution to improving crop growth in tough conditions,” said Prof. Tester.

How Plant Science Can Improve Food Security

Among the plants being cultivated and studied in the CDA greenhouse are rice plants. Demonstrating some of the crops that have grown in this controlled environment, Prof. Tester points out how “this one species of rice feeds half of the planet. It’s really important because it feeds the poor half of the planet – mainly in Asia and Africa.”

Taking into account the vital importance of rice crops to continue feeding the world’s growing population, it’s particularly significant that rice plants, as most crop plants, are salt-sensitive. They are indeed easily negatively affected by high salinity.

So Prof. Mark Tester and his team are studying the more salt-tolerant crops, such as barley and tomatoes, in order to better understand how they tolerate salinity, and then use that knowledge to improve other vital crops for our increasing food demands.

For instance, his team is growing a particular type of tomatoes, found on the Galapagos Islands, which are amazingly able to grow right at the edge of the sea and flourish in saline water. “We’re trying to discover the genes that are in these Galapagos tomatoes that allow the plants to grow in these crazy tough conditions,” said Tester.

“We want to use that knowledge to make commercial tomatoes even tougher,” he adds. By extension, “we can then turn our attention to rice and potentially improve its salt-tolerance.”

Source : KAUST News

Amazon's delivery drones. Credit: Amaon

Making drones more customizable

Airware’s operating system makes drones simple to build and modify for multiple applications.

By Rob Matheson 

A first-ever standard “operating system” for drones, developed by a startup with MIT roots, could soon help manufacturers easily design and customize unmanned aerial vehicles (UAVs) for multiple applications.

Today, hundreds of companies worldwide are making drones for infrastructure inspection, crop- and livestock-monitoring, and search-and-rescue missions, among other things. But these are built for a single mission, so modifying them for other uses means going back to the drawing board, which can be very expensive.

Now Airware, founded by MIT alumnus Jonathan Downey ’06, has developed a platform — hardware, software, and cloud services — that lets manufacturers pick and choose various components and application-specific software to add to commercial drones for multiple purposes.

The key component is the startup’s Linux-based autopilot device, a small red box that is installed into all of a client’s drones. “This is responsible for flying the vehicle in a safe, reliable manner, and acts as hub for the components, so it can collect all that data and display that info to a user,” says Downey, Airware’s CEO, who researched and built drones throughout his time at MIT.

To customize the drones, customers use software to select third-party drone vehicles and components — such as sensors, cameras, actuators, and communication devices — configure settings, and apply their configuration to a fleet. Other software helps them plan and monitor missions in real time (and make midflight adjustments), and collects and displays data. Airware then pushes all data to the cloud, where it’s aggregated and analyzed, and available to designated users.

If a company decides to use a surveillance drone for crop management, for instance, it can easily add software that stitches together different images to determine which areas of a field are overwatered or underwatered. “They don’t have to know the flight algorithms, or underlying hardware, they just need to connect their software or piece of hardware to the platform,” Downey says. “The entire industry can leverage that.”

Clients have trialed Airware’s platform over the past year — including researchers at MIT, who are demonstrating delivery of vaccines in Africa. Delta Drone in France is using the platform for open-air mining operations, search-and-rescue missions, and agricultural applications. Another UAV maker, Cyber Technology in Australia, is using the platform for drones responding to car crashes and other disasters, and inspecting offshore oilrigs.

Now, with its most recent $25 million funding round, Airware plans to launch the platform for general adoption later this year, viewing companies that monitor crops and infrastructure — with drones that require specific cameras and sensors — as potential early customers.

A company from scratch

Airware’s roots date to 2005, when Downey, who studied electrical engineering and computer science, organized an MIT student team — including Airware’s chief technology officer, Buddy Michini ’07, SM ’09, PhD ’13 — to build drones for an intercollegiate competition.

At the time, drones were primarily used for military surveillance, powered by a “black box” that could essentially fly the drones and control the camera. There were also a handful of open-source projects — made by hobbyists — that let people modify drones, but the code was unreliable when tweaked. “If you wanted to do anything novel, your hands were tied,” Downey says.

The group’s decision: build a drone from scratch. But their advisor, Jonathan How, a professor of aeronautics and astronautics who directs of the Aerospace Controls Laboratory, told them that required too much time, and would cost them the competition.

“We said, ‘You’re right, but we’re MIT students, and we’d feel better getting last place and learning a lot doing it than winning the competition by repackaging a black-box solution,’” Downey says.

Sure enough, the team earned second-to-last place. “But we learned that black-box solution didn’t work if you’re trying to address new applications, and the open-source wasn’t reliable even though you could change the software,” Downey says.

A five-year stretch at Boeing — as an engineer for the U.S. military’s A160 Hummingbird UAV and as a commercial pilot — put Downey in contact with drone manufacturers, who, he found, were still using black boxes or open-source designs.

“They were basically facing the same challenges we faced as undergrads at MIT,” Downey says. Thus Airware was born in 2010 — first run only by Downey, then with Michini and a team of Boeing engineers — to make a military-grade “black box” system, but whose capabilities could be tweaked and extended.

Early prototypes were trialed by How’s group at MIT, before Airware entered two California incubators, Lemnos Labs and Y-Combinator, in 2013. Since then, they’ve raised $40 million from investors and expanded their team from five to more than 50 employees. “The last 18 months has been a rapid rise,” Downey says.

Not much of the early MIT drone designs made it into the final Airware platform. “But building that early drone at MIT, and having the idea to leverage an enterprise-grade platform that you can extend the capabilities of, very directly became what Airware is today,” Downey says.

“The DOS for drones”

Today, Downey says, the development of a standard operating system for drones is analogous to Intel processors and Microsoft’s DOS paving the way for personal computers in the 1980s. Before those components became available, hobbyists built computers using software that didn’t work with different computers. At the same time, powerful mainframes were only available to a select few — and still suffered software-incompatibility issues.

Then came Intel’s processors and DOS. Suddenly, engineers could build computers around the standard processor and create software on the operating system, without needing to know details of the underlying hardware.

“We’re doing the same thing for the drone space,” Downey says. “There are 600 companies building differing versions of drone hardware. We think they need the Intel processor of the drones, if you will, and that operating system-level software component, too — like the DOS for drones.”

The benefits are far-reaching, Downey says: “Drone companies, for instance, want to build drones and tailor them for different applications without having to build everything from scratch,” he says.

But companies developing cameras, sensors, and communication links for drones also stand to benefit, he adds, as their components will only need to be compatible with a single platform.

Additionally, it could help the Federal Aviation Administration (FAA) better assess the reliability of drones; Congress recently tasked the agency with compiling UAV rules and regulations by 2015. This could also help promote commercial drone use in the United States, which lags behind other countries around the world, primarily in Europe, Downey says.

“Rather than see a world where there’s 500 drones flying overhead, and every drone has different software and electronics, it’s good for the FAA if all of them had reliable and common hardware and software,” he says. “We think it’s valuable for everybody.”

Source: MIT News