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Watch the video: Farming: Hydroponics in the City

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Keeping agriculture sustainable increasingly means keeping it local. Besides the environmental benefit of reducing reliance on fossil-fuel guzzling transportation, eating local food is a more seasonal and often healthier experience. With concern about food security growing, it might turn out to be safer, too.

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Play the game. To find the correct combination to make plants thrive

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In this free online science interactive, students explore how a plant's environmental conditions affect its growth and development.

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Here's a definition of a food chaing

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Read the article "Can Plants Grow Without Soil?"

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Today's Wonder of the Day was inspired by Casi from AL. Casi Wonders, " Why do plants need water? " Thanks for WONDERing with us, Casi!

What do you think of when you hear the word ""? A small patch of filled with beautiful flowers and vegetables? Rows of , lettuce, and tomatoes proudly out of the ground?

What about a huge greenhouse full of pipes a wild variety of flowers and vegetables? No? Well...think again! As crazy as it seems, it's possible to grow plants above the ground without any at all.

Researchers discovered hundreds of years ago that simply holds nutrients close to plant roots, but the itself isn't for plant growth.

Using a growing method called "hydroponics," you can grow plants in a watery solution of nutrients instead of . The word "hydroponic" comes from the Greek words hydro ("water") and ponos ("labor").

The keys to plant growth are a variety of nutrients, including nitrogen, phosphorus, and potassium. If you can add these nutrients into a plant's water supply, you no longer need for the plant to grow. Just about any plant can be grown with hydroponics.

Hydroponic containers can take many forms. Large hydroponic farms use networks of pipes with holes for plants. The pipes supply nutrients in a watery solution to the plants' root systems.

It's also possible to grow plants hydroponically by placing their roots in a solution contained in a non- material, such as gravel, coconut husks, or paper. These non- materials can provide greater support for the plants' root systems.

Hydroponic plants tend to grow well and produce high yields. Plant roots have a constant supply of oxygen.They also have access to as much or as little water as they need. Water in hydroponic systems is also reused constantly , thereby lowering water costs.

Hydroponics has many benefits in the modern world. In areas where good is scarce, hydroponics allows residents to grow fresh food. Since hydroponic farms can be set up indoors, fresh food can be grown all year long.

Hydroponics also may enable astronauts to spend longer periods of time in space, as future missions may require long travel times.

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Today's Wonder of the Day was inspired by Casi from AL. Casi Wonders, " Why do plants need water? " Thanks for WONDERing with us, Casi! What do you think of when you hear the word ""? A small patch of filled with beautiful flowers and vegetables?

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Here's an example of a food chain

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How living things rely on each other