Quiz: Growing Substrates

Welcome to your Quiz: Growing Substrates

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1. __________  is a growing medium composed of expanded clay pebbles.
2. It is a substrate made from the natural ingredients basalt rock and chalk.
3. It is a high oxygen hydroponic medium, is usually mixed with another medium to increase water retention and its dust is harmful when inhaled.
4. This growing medium is somewhat like perlite except that is has a relatively high cation-exchange capacity, which means it can hold nutrients for later use.
5. Using this as a medium, which is also sometimes referred to as using "no medium", is very cost-friendly, because it essentially means that you don't have to buy a medium.
6. In hydroponics a "_______________" is what you will use in place of soil to place your plants’ roots.
7. The disadvantage of this growing medium is that they do not retain water or oxygen very well and therefore may require you to mix them with another medium to increase water retention.
8. One must be careful not to buy the cheaper ones of this growing substrate because it is known to contain large amounts of sea salt, which may hurt your crop.
9. The most important quality a high grade Rockwool should have is _____________.
10. The disadvantages of this growing medium is that it breaks down after several uses and it doesn't drain quite as well as others that's why it is often mixed with other media to improve drainage.
11. Coco coir is known to leech out a vital nutrient, which then has to be reintroduced as a supplement. This nutrients is ________.
12. The greatest advantage of coco coir is that __________.
13. Baked clay pebbles are widely used in ebb and flow hydroponics systems, because they hold just the right amount of water and drain efficiently. Is this statement True or False?
14. Regardless of which substrate you choose, there is a system which introduces fish in the reservoir to provide essential nutrients to your plants. This system is known as __________.
15. Rockwool cubes come in different sizes, the smallest of which are used in _________.
16. The next size up (Rockwool cube) is usually used for __________.
17. Which substrate can be irritating to your skin?
18. A video in this Module compared Hydro Korrels with Hydroton—which substrate was recommended by this particular video?
19. Coco coir is eco-friendly and doesn’t support the growth of __________.
20. It is recommended that you mix coco coir with perlite and _______ before using it as a substrate.

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