3 8 soil introduction
TRANSCRIPT
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Soil Introduction
Tilthe
Plant: Pansy
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PansyViola x wittrockiana Plant type: Annual, Biennial*, Perennial* USDA Hardiness Zones: 7b - 11 Height: 6" to 12”, Spread: 6 - 12" Exposure: full sun, *part shade Bloom Color: Blue, Orange, Pink, Purple, Red, White,
Yellow Bloom Time: Early to late spring, not summer, Mid fall
to Early winter Uses: Bedding plants, containers *Pansies are cool season flowers. They may or may
not survive summer heat or winter cold.
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Tilthe Physical condition of soil,
especially in relation to its suitability for planting or growing a crop.
The ability of the soil to form stable aggregates
Improved by the addition of organic matter
Improves both moisture holding and drainage.
Improves the microbial balance of the soil
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Tilthe
Good Bad
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What is soil made of?
Mineral material - different sizes Sand Silt Clay
Organic matter decayed remains of plants and animals Soil microbes – especially fungi
Air Water
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How much?
Mineral – less than ½ Organic – only 5% Most is pore space
Water Air
If the soil is compacted, how would the percentages change?
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Soil Particle Size
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Compaction
Why do you sink in a ball pit?
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All particles are the same size Cannot compact Pore space is always
the same Readjust position
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If particles were different sizes: Small particles are
forced into pore spaces Compaction
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Types of Soils
Particle Size Sand Silt Clay
Soil Classification Sandy Soil Clayey Soil Loamy Soil
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Drainage
The ability to hold just the right amount of water is the soils drainage
Drainage is measured by percolation tests Sandy soils don’t hold enough water Clay soils hold too much
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Water – what is available for plants? Percolating water Capillary water Adhesive (bound) Ground water
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Soil Improvement
Drainage & Aeration: Create Aggregates
Lime & gypsum Organic Matter
Add earthworms Raised beds
Moisture Retention Organic Matter Mulches
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Tillage??
Good Break up clumps Mix in soil
amendments Remove rocks &
roots Shape the soil
Raised bed or furrow Remove weeds
Bad Increased erosion Can hurt soil
aggregates Wet soil Clay soil
Can disrupt earthworm and fungi
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When can soil be worked in Spring? Must crumble when worked Dig about 6” down If a hand-full of soil forms a tight ball after
releasing pressure, it needs to dry more Working soil too soon in spring causes
compaction
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Soil texture testing
Need samples Clay area behind greenhouse Sandy soil mixed Garden soil
Texture test Suspension Test