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24 Cards in this Set
- Front
- Back
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give 5 desirable qualities in a growing medium (potting soil) |
- clean! (insect, pathogen, weed seed free) - good soil structure (aeration, drainage) - light weight soil (except for anchoring plant like cacti) - low salts (salts will increase over time with fertilizer application) - ph of 5-6.5 - a good cation exchange capacity |
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peat moss has a ph of ____ which means it is considered _____. |
- ph of 4 - it is acidic |
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peat moss is made up of _____ |
decomposed moss |
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peat moss has very fine particles and is considered a ______ growing medium by itself |
very poor (poor aeration and drainage) |
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give 3 points as to why top soil is not an appropriate container soil |
- small pore spaces give poor aeration and drainage - very low amount of organic matter (5%) and usually very decayed - pathogens and contaminants may be present - it is heavy and costly for shipping and labour |
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Composted bark is a good growing medium for _________ crops |
long term |
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_______ and ________ are considered crucial in container culture. |
- drainage - aeration |
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deeper is better for container culture because ______________ |
effects of a perched water table are less limiting (more space for unrestricted root growth .. refer to pg 48) |
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True or False? The level of a perched water table (bottom of container that is saturated after watering) is the same in different heights of containers. |
True! |
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List the 5 commonly used inorganic amendments |
- sand - vermiculite - perlite - Styrofoam - pumice |
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what is vermiculite? |
expanded clay |
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what is perlite? |
popped volcanic rock (super heated and pops like popcorn) |
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what makes styrofoam a less ideal amendment? |
- does not hold moisture - lightweight and floats to the top of container (doesn't do any good for aeration on the top) |
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Pumice is excellent for _______ |
aeration and drainage |
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give 3 advantages of peat lite mix that make it a desirable container mix |
- excellent soil structure (good drainage, aeration CEC) - light weight - free of pathogens |
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What are the ingredients of Peat Lite Mix? (what we mix into our GH soil mix) |
- peat moss - Perlite and or vermiculite - gypsum - superphosphate (or bonemeal or phosphorous) - dolomite lime - trace elements |
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Vermiculite has a good or poor CEC? |
good CEC |
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True or False? Vermiculite will compact over time and is not suitable for long term crops. |
True |
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Perlite has a good or poor CEC? |
good |
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True or False? Perlite has small poor spaces and will compact over time. |
False! Perlite has large pore spaces and does not compact over time |
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Dolomite Lime is composed of ___________ and _______ and has a PH of _____ |
- calcium - magnesium - PH 8 |
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place in order of saltiest to least salty: vermiculite, peat, sand, perlite |
- sand - vermiculite - perlite - peat |
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pasteurization happens after what temperature? |
80 C |
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are beneficial microbes harmed during pasteurization? |
no |
