Mont: Y8 Hort and Aquaponics

5. A method of growing plants without soil, using mineral nutrient solutions in a water solvent.
8. A scale used to specify the acidity or basicity of an aqueous solution.
9. The process by which air is circulated through, mixed with or dissolved in a liquid or substance.
10. The act of cutting or trimming parts of a plant to improve its shape, growth, or yield.
12. A hydroponic technique where a very shallow stream of water containing all the dissolved nutrients required for plant growth is re-circulated past the bare roots of plants in a watertight gully.
13. A device that provides a place for the nitrification bacteria to grow and convert ammonia into nitrates.
16. - The process by which nitrogen is converted into various chemical forms as it circulates among the atmosphere, terrestrial, and marine ecosystems.
17. A plant that completes its lifecycle in two years or growing seasons.
18. - The biological oxidation of ammonia to nitrite followed by the oxidation of nitrite to nitrate.

1. - The number of fish housed in a given volume of water.
2. The artificial application of water to soil for assisting in the growth of crops.
3. The cultivation of aquatic organisms, such as fish or shellfish, often for food.
4. Organic matter that has been decomposed and recycled as a soil amendment and fertilizer.
6. The process by which a plant grows from a seed.
7. A plant that completes its entire lifecycle in one year or growing season.
8. A plant that can live for more than two years, producing flowers and seeds over a long time.
11. The process by which plants convert light energy, usually from the sun, into chemical energy.
14. The scientific study of plants.
15. A substance added to soil to increase its fertility and support plant growth.