Step 1: Identifying Sandy Soil
When rubbed between your fingers, sandy soil feels gritty and falls apart if you try to roll it into a ball. Coarse sand is free- draining, but very fine sand doesn’t drain well and can easily become compacted. Sandy soils are low in nutrients but easy to dig, which is why they are known as “light soils.”
Step 2: Identifying Clay Soil
This type of soil feels smooth and sticky, and can be rolled into a ball when wet. Clay is also porous and holds nutrients and water well, although plants cannot extract all of the moisture from clay, because an electrical charge on each of the particles holds it too tightly—rather like iron filings clinging to a magnet.
Step 3: Identifying Acidity and Alkalinity
Some plants, such as azaleas, only grow well on acidic soils, while others, such as acanthus, prefer alkaline conditions, so it is important to establish the pH (acidity or alkalinity) of your soil. Soil testing kits are available and easy to use. Take a few soil samples—the pH may differ throughout your yard.
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Single digging is so called because it involves turning over the soil to the depth of a single spade blade.
By: Felder Rushing
By: National Gardening Association