Testing Soil Drainage and Texture

Your soil's texture and drainage can influence how you care for your plants. Follow these steps to better understand your garden soil.

Loamy Soil Will Hold Together When Squeezed

Loamy Soil Will Hold Together When Squeezed

Squeeze soil into ball. Sandy soil will not stick together. But if the soil is loamy, the shape may hold a little.

©2011, Dorling Kindersley Limited

2011, Dorling Kindersley Limited

Squeeze soil into ball. Sandy soil will not stick together. But if the soil is loamy, the shape may hold a little.

Related To:

Materials Needed

  • shovel
  • water source

Step 1: Squeeze a Handful of Soil

Grab a handful of moist soil and squeeze it. Clay soil is slippery and oozes between your fingers; it holds its shape when you release it. Loam holds together but falls apart when you poke it. Sandy soil feels gritty and falls apart easily. Add organic material, such as compost, manure, or shredded leaves to sandy soil to improve its ability to hold water and to clay soil to help it drain more quickly.

Step 2: Form a Ribbon of Soil in Your Hand

Soils that won't form a ribbon when rolled between your thumb and fingers contain at least 50 percent sand and only a little clay. Ribbons that break before reaching 2 inches long contain about 25 percent clay. If you can squeeze out a ribbon 2 to 3-1/2 inches long, your soil contains at least 40 percent clay.

Step 3: Dig a Hole

Another way to determine the texture of your soil is to check how fast water drains through it. Dig a hole 1 foot deep by 1 foot wide. Fill the hole with water and record how long it takes for the water to completely drain. The ideal time is between 10 and 30 minutes. If it drains in less than 10 minutes, the soil is drought-prone and most suitable for plants that need dry or well-drained soil. If it takes 3 to 4 hours, your soil is poorly drained, due either to a large percentage of clay or an impermeable layer of minerals below the surface that blocks water movement. Watering tip: If you live where irrigation is a necessity, apply water to clay soils very slowly but long enough for the water to soak in deeply, then withhold water until you're sure it's needed again. Conversely, if your soil is sandy, water for less time but more frequently.

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