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Soil Testing Guide
2. Soil Texture Test
Use clear jar:
Fill 1/3 with soil.
Add water nearly to the top.
Shake vigorously.
Let settle for 24–48 hours.
The layers will separate:
Sand on bottom
Silt in middle
Clay on top
This helps you understand soil texture and drainage characteristics.
3. Earthworm Count
Dig a hole about 12 inches deep and wide.
If you find:
10+ worms = generally healthy biological activity
Few or no worms = soil may need more organic matter
1. Observations
Dark green, vigorous growth = generally fertile soil
Yellowing leaves = possible nutrient deficiencies
Compacted soil =Poor drainage
Sparse earthworms = low biological activity
4. Infiltration Test
Remove both ends of a coffee can.
Push it into the soil a few inches.
Fill with water.
Time how long it takes to soak in.
Fast infiltration usually indicates better structure than compacted soil.
5. pH Test Using Red Cabbage
Chop up red cabbage.
Simmer in water for 30 minutes.
Strain cooled liquid.
Place tablespoon of soil in a clear cup.
Add strained liquid to cover the soil.
Stir and let it sit for 30 minutes.
Results
Pinkish = Acidic soil
Purplish = Near neutral
Blue/Green = Alkaline soil
6. Free Extension Service Testing
Many counties and universities offer low-cost or occasionally free soil testing through agricultural extension programs.
Since you're familiar with Georgia and northeast Florida, check with:
University Extensions
They often provide testing guidance and may have programs that significantly reduce costs compared to commercial labs.
Soil Is Too Acidic (Low pH)
Signs:
Many vegetables struggle to grow
Poor nutrient availability
Soil test shows pH below the recommended range
Solutions:
Apply agricultural lime according to soil test recommendations
Add finished compost regularly
Use crushed oyster shell or other natural calcium sources where appropriate
Note: Raise pH gradually. Large applications can create new nutrient imbalances.
Soil Is Too Alkaline (High pH)
Signs:
Yellowing leaves despite adequate fertilization
Nutrient deficiencies, especially iron
Soil test shows pH above the recommended range
Solutions:
Add organic matter such as compost
Apply elemental sulfur if recommended by a soil test
Use acidic mulches such as pine needles where appropriate
Note: Lowering pH is generally a slow process and may take multiple seasons.
Low Earthworm Count:
Solutions
Add compost regularly
Apply mulch to protect soil from heat
Reduce or eliminate tillage
Maintain adequate soil moisture
Grow cover crops
Leave plant residues on the soil surface
Earthworms naturally increase when food, moisture, and shelter are available.
Poor Soil Texture
Heavy Clay Soil
Common Problems:
Poor drainage
Compaction
Slow root growth
Solutions:
Add compost annually
Apply mulch
Grow deep-rooted cover crops
Avoid working soil when wet
Encourage earthworm activity
Do not add small amounts of sand to clay soil, as this can create a concrete-like texture.
Sandy Soil
Common Problems:
Poor water retention
Nutrient leaching
Low organic matter
Solutions:
Add compost regularly
Apply mulch
Grow cover crops
Incorporate biochar where appropriate
Increase organic matter over time
The goal is to improve the soil's ability to hold water and nutrients.
The Earth Care Approach
Healthy soil is built over time through organic matter, biological activity, and proper water management.
Rather than relying solely on inputs, focus on supporting the natural processes that create fertile soil:
Feed the soil with compost
Protect it with mulch
Keep living roots growing whenever possible
Minimize disturbance
Encourage soil biology
Small improvements made consistently can transform soil health over time.
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Global Earth Care Network
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email: connect@earthcarenetwork.org
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