Nutrient-rich water is brought to the wetlands during each high tide, making a high rate of food production possible.

在每次涨潮时，富含营养的水被带到湿地，使高粮食产量有可能实现。

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On land, the supportive buoyancy of water is missing, the plant is no longer bathed in a nutrient solution, and air tends to dry things out.

在陆地上，水的浮力支持消失了，植物不再浸泡在营养液中，空气会使植物变干。

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According to Ben Urbonas, president of the Urban Watersheds Research Institute, these nutrient contaminants tend to be more of a problem in closed water systems,like lakes, where concentrations can build up.

VOA: standard.2010.08.04

Many supermarket vegetables are already grown hydroponically in nutrient-enriched water, and research indicates this technique could work well in space.

CNN: To boldly grow where no one has grown before

That means building futuristic structures that use wastewater and solar power to produce hydroponic (grown in a nutrient-rich water, without soil) and aeroponic (grown in water-saturated air) crops.

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Hydroponics and aeroponics - a type of hydroponics, but rather than growing in nutrient-rich water, grows in the air and the plants get sprayed with nutrients - technology is increasingly being utilised by businesses themselves.

BBC: The technology that's transforming gardening