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The Jar Test for Soil Texture: Identifying Sand, Silt, and Clay Layers

Shake soil with water in a jar; let settle for days. Layers from bottom to top:

Sand (largest particles, settles first)
Silt (middle)
Clay (top, finest particles)

Organic matter may float; water stays cloudy. If clay >50% of the column, add organic matter and gritty sand (paver leveling sand) to improve structure.

Soil jar test

About Gardening: Gardening in Oily Sand: Improving Water Penetration; Neighbor's Paver Sand: Use in Garden, Not on Lawn; Perlite Alternatives for Sarracenia Soil: Silica Sand from North Carolina Coastal Plain; Why Perlite Beats Sand for Carnivorous Plant Soil: Weight, Aeration, and Purity; Herbs for Florida Zone 9 Sand: Amending Soil and Choosing Heat-Lovers; Soggy, Smelly Garden Soil: Diagnosing Anaerobic Conditions and Drainage Fixes; Amending Red Clay Soil for Gerbera Daisies; Horticultural Sand vs. Building Sand for Turf Leveling: Don't Layer; Eliminate Sand Spurs Organically with Sugar; Building a Lawn on Pure Sand: Soil Amendment Recipes for a West Michigan Sand Dune

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