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1. To describe the comparative advantages and disadvantages of hydroponic media.
2. To describe the quantity and quality of light needed for hydroponic plant production.
3. To select lights for hydroponic plant
production.
1. What are the char. of a good media?
a. Firmly anchors the plantb. Will not break downc. Absorbs and retains moistured. Porous enough to allow air
circulation and drainage
e. Protects plant roots from temperature extremes
2. What types of media are used in hydroponics?
a. Sand b. Rockwoolc. Expanded Clay Pelletsd. Perlitee. Vermiculite f. Coconut Fiber
Plentiful, long-lasting, easy to clean and relatively inexpensive. Heavy when
wet and dries out quickly. Use course not fine sand
Inorganic, sterile. Made from basalt, rock, limestone, and silica. Comes in block cubes and slabs. Excellent water/air hold capacity. Preferred by “commercial growers”
Mined from lava flows, then crushed, screened and heated. Light weight, good water retention, sterile. Rinse before using.
Plentiful, long-lasting, easy to clean and relatively inexpensive. Heavy when wet and dries out quickly.
4. What quality of light is needed for plant growth?
Flowering plants need stronger red light. Leaf vegetables such as lettuces and most house plants want blue light for better vegetative growth.
5. What type of lights should we use for our indoor hydroponic units?
Fluorescent lights
Metal Halide Lamps
High Pressure Sodium Lamps
Best for germination and plants less than two feet tall. Not generally recommended. Use combination of “warm light.”
(Metalarc- MA, Super Metalarc – SMA) are the best artificial light source available today. Emit correct amounts of blue and red light.
Emit plenty of red light but not enough blue. Very efficient and economical so often used despite short comings.
1. To describe the comparative advantages and disadvantages of hydroponic media.
2. To describe the quantity and quality of light needed for hydroponic plant production.
3. To select lights for hydroponic plant
production.