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Interest ApproachWhat makes a great
basketball team?• 5 or more members that work well together.• At least 1 who can score points from 20’ +.• At least 1 who can be used inside the key.• 1 or more who can control the ball.• 1 or more to push the ball inside.• Each player has their strengths!
Interest ApproachWhat makes a great growing
medium?• Several components that work well
together
• 1 or more that hold water.
• 1 or more that hold air.
• 1 or more sources of nutrients.
• 1 or more to help defend against pest.– Components that are sterilized.
Interest ApproachWhich Makes the Best
Growing Medium?• Sand
• Peat Moss
• Field Soil
• Vermiculite
• Pearlite
• Water
• Gravel
Student ObjectivesBy the end of this lesson, you
will be able to:• 1. Identify the types of growing media.
• 2. Describe the functions of growing media.
• 3. Explain the relationship between growing media and plant growth.
TERMS
• Aeration – the presence of air• Growing medium – material used for plant
growth• Hydroponics – growing plants w/o “soil”• Leach – to remove by percolation• Pore spaces – voids for water or air holding • Soil – outer layer of the earth suitable for plants• Soilless medium – sterile product/s used for
plants
What are the types of growing media used in floriculture
production?• Is “soil” used?
• Soil – the earth’s outer crust is full of life!– Bacteria– Fungi– Invertebrates
What are the negatives of using “SOIL” for containers?
• Unknown history of:– Pesticides– pH– Fertility level
• High shrink / swell– Soil shrinks as it dries – forming cracks
• Higher disease probability
So what media should you use?
• Sand? Dries to quickly.
• Peat moss? Dries to slowly.
• Coir? Hard to get wetted.
• Water? To little air.
• Pearlite? To much air.
• Vermiculite? Pricey.
• Potting soil mixes? Just right.
The 3 basic types of media!
• Soil – natural layer of the earth that supports life.
• Soilless – any material for growing plants not containing topsoil.
• Hydroponics – plants grown primarily in nutrient solution.
What are the functions of the growing media?
• Must provide AIR.
• Must provide WATER.
• Must provide Nutrients.
• Must provide ANCHORE / SUPPORT.
What effect does growing media have on plant growth?
• Supplying Nutrients
• Some media cannot hold essential elements for plants. Nutrients are leached out to rapidly.
• Stressed plants are prone to disease and insect damage – increasing loss.
• Reduced growth = lower returns
What effect does growing media have on plant growth?
• Supplying Air
• As air is reduced, plant stress increases.
• Roots need oxygen and water – both in moderation.
• Increasing stress increases pest susceptibility and profit loss
Necrotic line patterns in the foliage of a cyclamen affected by impatiens necrotic spot tospovirus
(INSV).
What effect does growing media have on plant growth?
• Uniformity
• Large scale production demands that all plants perform equally.
• This is only possible if all plants get equal inputs from a uniform media.
What are the functions of growing media?
• Supply Air.– Why?
• Supply water.– Why?
• Supply nutrients.– Why?
• Supply support / anchor.– Why?
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