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Soil Texture

Soil texture

Dig your hands down into the earth. What do you feel? Every handful of soil has its own individual texture, and those characteristics offer a significant contribution to crops. What determines the unique textures of soil? Why is it important, and which type of soil has more erosion resistance? Find the answers to these questions and more with this informative article.

What Is Soil Texture?

When a pedologist mentions ‘soil texture,’ they’re referring to the amount of various sized sand, clay, and silt particles in a sample of dirt. The composition of these grains makes up the inorganic parts of soil and are the bits and pieces that bind with organic matter to form topsoil.

The size of soil’s particles and their spacing also determines how much water will flow through it. Soil with a higher concentration of large grains of sand will have a greater infiltration rate, while dirt that is primarily clay will pool water on its surface as opposed to absorbing it.

Soil Textural Classes

A soil’s textural classification refers to the combination of sand, silt, and clay that make up the soil. It can be determined using exploratory research methods such as feel. A coarse-textured soil is probably composed primarily of sand, while a fine-textured soil is most commonly dominated by clay.

Farmers can also take a quantitative approach with a hydrometer. With this lab-based method, the soil is mixed with a sodium hexametaphosphate solution to separate the earth’s aggregates into identifiable parts. The U.S. Department of Agriculture outlines 12 primary soil texture classifications including the four most common types: sand, loam, silt, and clay.

Sand

Sand is the largest sized dirt particle. Each grain ranges in size from 2.0 mm down to 0.05 mm. It feels gritty to the touch. Since sand is just a bit of gravel, it drains well but doesn’t do an adequate job of retaining essential water and nutrients. Gravel particles that are larger than 2.0 mm are not considered when determining texture.

Loam

The soil that’s referred to as loam offers a proportion of 40% sand, 40% silt, and 20% clay in a single sample. It’s often the dirt of choice for making bricks and provides plenty of organic material for growing crops.

Silt

Silt particles are considered moderate in size. However, with sizes ranging from 0.05 mm down to 0.002 mm, individual particles are too small to see with the naked eye. It has a similar shape as sand particles, just worn down to a smooth texture.

While it’s not as strong as sand, silt is better at holding both water and nutrients. Because it’s prone to losing small amounts of minerals from each particle, silty soil generally makes more minerals available to your plants.

Clay

The smallest sized dirt particle, clay is less than 0.002 mm in diameter. To put that in perspective, you’ll need to line up 12,000 clay particles side by side to measure one inch. Clay feels sticky in your hands and is an excellent building medium.

What Determines the Texture of the Soil?

The percentage of materials determines a soil’s textural class, including the common particles we’ve already met: sand, silt, loam, and clay. Its texture is an important characteristic that influences a diverse number of properties, including water infiltration rates, aeration, susceptibility to erosion, and pH buffering capacity.

The Importance of Soil Texture

The texture of your field’s soil is essential to a successful harvest on a variety of levels. From saturation to water-holding capacity, let’s discuss each component of soil texture’s importance.

Infiltration

The amount of clay, sand, or silt in the dirt defines the rate at which water is able to drain through it. Once saturated, water moves more quickly through sandy soils than it does through soil that’s heavy in clay.

Availability

Soil texture influences how much water is available to your plants. Once your field’s saturation level reaches capacity, your clay soil will hold more water than its sandy counterpart.

Drainage

Well-drained fields are usually a sign of proper soil aeration. This texture of dirt is rich with air, which promotes a healthy root system and leads to a bumper crop.

Erosion

Different textured soils also respond differently to erosion. Some are more susceptible to loss based on their percentage of silt and clay particles. Those soils have a higher erodibility level than a sandy soil under the same weather and tilling conditions.

Organic Matter

Various soil textures also offer different levels of organic matter. This material breaks down faster in sandy soils than in silt and clay, likely due to the higher availability of oxygen for decomposition.

How Soil Texture Affects Erosion

Now we understand that a soil’s texture is directly related to the amount of clay, silt, and sand particles it contains. But what does this have to do with soil erosion? Soil texture has two main effects on erosion.

First, it influences the rate of infiltration and water’s ability to enter the soil. When it rains, does the water run off rapidly? If so, then you probably have sandy soil. This type of dirt has large pores that act like pipes, channeling water right into the ground.

Does the water collect on the surface or in low lying areas? If it does, then you probably have clay soils that are not known for providing good drainage.

Second, some types of dirt particles don’t detach as easily as others. Silt particles wash away easily because they’re tiny and don’t readily combine with other soil aggregates.

Which Type of Soil Is More Erosion Resistant?

One study suggests that an estimated 30 tons of agricultural soil are lost in the United States to erosion each year. This loss outpaces the rate of formation by an astonishing eight times.

So, which type of soil offers the most erosion resistance? The answer is clay. Clay is better at resisting erosion because it’s small particles hold water, making it a stickier compound than sand.

A soil’s texture affects many aspects of your garden, including erosion. Use this handy guide to help determine your dirt’s composition and how you can use that information to help you conserve topsoil.

What Does Soil Need to Stay Healthy?

The key to any beautiful yard or garden is healthy soil. Essential for providing nutrients and support, healthy soil can make or break your landscaping or gardening efforts. For some homeowners, the soil around the house isn’t ideal for growing the plants they want, which can make it almost impossible to create the yard of their dreams. Indoor or patio container gardens can struggle with the same issue. 

Luckily, there are several ways you can improve the health of your soil, whether in your yard or in a container garden. We’ve created this guide to provide information about what makes healthy soil and ways you can improve it. 

What Makes Healthy Soil

Gardeners have many opinions on what makes soil healthy. Often, soil health depends on the region, its soil type, and the plant life it supports. Some attributes of soil that are important to be aware of include:

  • Texture: Soil comes in many types, typically categorized as sand, silt, or clay. Many regions have soil that is a mix of these three types. Sand is the loosest, while clay is the most tightly packed.
  • Organic Matter: Organic matter can affect your soil in a number of ways, ranging from soil adhesion to absorption to food for the organisms that live below ground.
  • Air Retention: Ideally, soil should have about 25% air retention. This gets oxygen to the roots without allowing so much air that the plant rots.
  • Water Retention: Soil should also have about 25% water retention to allow for the formation of both large and small soil particles. This helps support plant movement and the presence of soil life.
  • Soil Life: Everything from mites to earthworms make their home in the soil, and their presence provides plants with much-needed nutrients. In addition, their movement in the ground keeps soil from getting too packed. 
  • pH Balance: pH level is one of the trickiest components to balance but is very important to your soil’s health. Some plants need more basic soil while others thrive on acidity. Being aware of and manipulating your soil’s pH balance can make a huge impact on the success of any garden or landscaping.

These factors all contribute to healthy soil. Knowing how to improve them can help plant life thrive. To tell what type of soil you have and whether you need to make any changes, fill one-third of a jar with water. Add soil, and shake the jar until everything is mixed. Leave it overnight; it should stratify into different levels as it settles, with the organic matter on top. Mark the different levels so you know your ratio of soil types. Make sure there’s organic matter on top. If not, you need to add some into your soil. 

Improving Potting Mix

Potting mix is a difficult substrate to get right. Container gardens are less flexible than yard gardens because they’re self-contained. One of the best ways to improve a potting mix is to add another substrate to enhance both the texture and the nutrients. Coir is a great organic soil additive to help your potted plants thrive. Thanks to its porous nature, coir keeps oxygen in the soil while still providing the needed nutrients. Because it’s so absorbent, it is also easy to re-wet. This helps your plants stay healthy if you’re dealing with dry conditions. 

To use coir as a potting mix, start with your favorite potting soil. Place a coir brick in a large container with plenty of water. It’s important to use a container that’s big enough: Coir expands significantly when soaking. After you’ve soaked the substrate fully, mix it in with your soil. We recommend a 40% coir to 60% soil mixture. It’s important to note that because coir is so absorbent, you have to be very careful about salt buildup. 

Another popular alternative is homemade compost. Start with a compost bin in your kitchen or outside and only add items that will compost properly. A good rule of thumb is to think of things that rot easily. Common composting items include eggshells, fruit and vegetable scraps, grass and plant clippings, coffee grounds, and shredded newspaper. 

Once these items begin to rot and mix together, simply combine them with a little soil and use the resulting compost as a nutrient-rich additive for your container garden. Add a few inches to the garden once a year, as the nutrients will seep into the soil over time.

Soil Amendment

You can improve the soil in your yard, as well. Start by determining your main soil makeup, based on the trick mentioned previously. Depending on what you find, you can figure out what additives to use to improve the overall health. It’s important to consider what sort of plants you want before you dive into soil amendment. For example, coir has a more balanced pH balance, making it good for plants such as ferns and asparagus. Peat moss is more acidic, which is perfect for acid-loving plants such as azaleas, blueberries, and camellias. 

Soil amendment also includes changing up the texture. Hard-packed clay is nearly impossible to grow many plants in, as they have a hard time pushing roots through the tight particles. Mixing in coir is a good choice in these situations, as the coconut fiber-based additive improves porosity and encourages healthy water flow. 

For sandy, loose soil, adding organic matter is key to getting a good consistency and texture. Whether you choose peat moss, coir, compost, or a store-bought blend, till it into the soil carefully and add more every year to ensure there are enough nutrients to support plant life. 

Having healthy soil can make all the difference in your garden, whether it’s in your yard or in a container. While it might take a little extra work, increasing the health of your soil will help benefit your gardening and landscaping projects in the long run.