Food/Controlled Environment Agriculture

Food production is seen as resource-intensive, requiring a lot of water, land, labour, and environmental impact. But what if we had a method of growing plants that needed 98% less water, 99% less land and 100% less fertilizer, pesticide and labour?

Aeroponics is the art of growing plants with their roots in air rather than in soil. The roots are intermittently spraying with nutrient-enriched water. This allows for precise control of the amount of nutrients that the plants receive.

The figures on Wikipedia  show that hydroponics (growing plants with their roots in a pool of nutrient-enriched water) yields are 50% to over 1700% higher than yields from growing in soil. Aeroponics yields are significantly higher even than those from hydroponics ^{[1] [2]}.

Controlled-environment growing lends itself readily to automation. Best of all, by optimizing the nutrient flow, we can supply plants with the nutrients they need to produce the flavonoids that give them their flavour. With controlled growing, it is possible to achieve a more intense flavour than growing in soil.

A controlled environment allows food to be grown year-round, independent of seasons. This is known as constant-yield growing. While only one harvest a year can be grown conventionally, constant-yield growth gives 4-30 harvests a year, depending on the plant.

A controlled environment greatly reduces the threat of pests and plant-diseases, eliminating the need for pesticides.

Omega Garden uses an innovative cylindrical design in which plants are constantly tilted so they have to adjust to gravity. This results in stronger, more compact growth. It is claimed that this method can result in a fivefold increase over other plants grown in the same conditions but without rotation.

LEDs can be used to provide light for plants. Experiments by the University of Manitoba have found that using LED lighting increases yields by about 40% ^[3]. LEDs could be useful in situations where sunlight is unavailable - such as in winter in regions far from the Equator, in underground or underwater dwellings, in cities where a demand for space means food must be grown on stacked shelves indoors, and in space habitats. Currently the main obstacle to large-scale controlled environment agriculture projects such as The Vertical Farm Project is the cost of energy needed to provide the light. As LEDs become cheaper and more energy-efficient (as with recent developments in OLED and PHOLED technology) this sort of production of high-quality food is becomes more and more feasible. Fibre-optic cables can pipe sunlight in from outdoors, significantly reducing the amount of energy needed.

There are many tricks that can be used to increase yield in controlled-environment growing that are not feasible on farms. Increasing carbon dioxide concentration in the air can increase yield 30-50%. Supplementing with fulvic acid can increase yield over 30%. Plant hormones such as gibberellin increase yields significantly. .

Note that several plants can be grown stacked vertically, greatly reducing footprint

Even with none of these tricks, a hydroponics garden can grow 2kg of vegetables a day (more than enough to nourish a person) in 20 square meters ^[4]. An aeroponic garden using LEDs, CO₂, plant hormones and fulvic acid could theoretically grow the same amount in perhaps half the space. It is realistic to stack five layers of crops one on top of another in a 2m high system, reducing the area needed fivefold. We can expect that in the near future, city-dwellers will be able to grow all their own food in their kitchen, without the need for farms at all. This food will be local, fresh and delicious. The technologies of aeroponics and in-vitro meat are also important pieces of the space colony puzzle.

Hydroponics uses 5-10% the water used for growing in soil ^[5]. And aeroponics uses 65% less water again, and only a quarter the nutrients ^[6]. This will make huge difference if we want to preserve our water resources, as 69% of all our water use is for agriculture ^[7].

Both of the necessary inputs for aeroponics - water and minerals - are in enormous abundance on Earth.

Using aeroponics and LED grow lights, the conditions of plant-growth can be monitored and controlled electronically. Dickson Despommier, an advocate of vertical, controlled-environment farming, has painted a picture of what this farming might be like -

"Each floor will have its own watering and nutrient monitoring systems. There will be sensors for every single plant that tracks how much and what kinds of nutrients the plant has absorbed. You'll even have systems to monitor plant diseases by employing DNA chip technologies that detect the presence of plant pathogens by simply sampling the air and using snippets from various viral and bacterial infections. It's very easy to do.

Moreover, a gas chromatograph will tell us when to pick the plant by analyzing which flavenoids the produce contains. These flavenoids are what gives the food the flavors you're so fond of, particularly for more aromatic produce like tomatoes and peppers. These are all right-off-the-shelf technologies. The ability to construct a vertical farm exists now. We don't have to make anything new."

Algorithms could be developed and shared online to model nutrient flow, timing, duration, intensity and color of light, and strains of plants used affects food yields and flavour. Programming these algorithms into computers that control the LED lights and the nutrient flow in the aeroponic system would yield a truly automated food-production system that anyone could use to grow their own food indoors. All this technology exists currently, and is being constantly improved and refined.