What Topsoil is Used for and How to Determine How Much Your Project Requires
Topsoil: What It's Used for and How Much Is Needed Per Project
Topsoil is, as the name suggests, which is the very top layer of soil that includes the first 2 to 8 inches in native soil, or the soil that already exists in your yard or garden. Quality topsoil is rich in nutrients and retains moisture well, providing beneficial microbial life that encourages healthy plant growth. However, not every yard and property has healthy, quality topsoil, so purchasing topsoil is a common experience for many gardeners and landscapers. But how do you figure out which topsoil you need, and how much is needed per project?
Types of Topsoil
- Sand: Sand topsoil is high in nutrient quality, but lacks organic material and the ability to retain water. This option is ideal for plants that don't require as much water, such as cacti. Sand topsoil can also be helpful in smaller amounts to avoid waterlogged roots and providing plants with more space to take root.
- Silt: Silt topsoil is great for water retention, but overall lacks in nutrients most plants need. However, when mixed in with nutrient-rich topsoils, silt is ideal for plants that require a lot of water.
- Clay:
Similar to silt, clay topsoil is also a good option for retaining water, but lacks organic materials. Since clay is denser than other topsoils, it's more difficult for plants to take root in, but can help maintain moisture for crops during hotter, drier weather.
- Loam:
Loamy topsoil is the ideal combination of sand, silt, and clay topsoil qualities, as it provides excellent drainage, moisture retention, organic materials, and nutrients. Finding natural loam topsoil is uncommon, so it's common to purchase ideal topsoil or additives to nurture your existing soil to create ideal growing conditions.
- Chalk:
Chalk topsoil is highly alkaline and isn't ideal for many plant types, but it's useful for retaining water during colder weather and draining excessive water, nutrients, and oxygen through its often rocky texture. When utilizing this type of topsoil, however, be sure to take note of which plants require more acidic or neutral pH levels in their soil.
- Peat: Peat topsoil appears as a result of soil that's been waterlogged for a while, as the peat composition forms from dead plant matter that's been pressed into a solid layer. Peat topsoil is high in carbon and other nutrients, which makes it an ideal addition to other topsoil types to create loamy topsoil.
How Much Topsoil Is Often Needed?
In order to figure out how much topsoil you'll need, a good starting point is taking accurate measurements converted to cubic feet, cubic yards, and cubic tons of the garden space or the areas that you're looking to add topsoil. From there, you can use an online topsoil calculator to narrow down how much topsoil to purchase and avoid purchasing too much. It's also important to remember that it's recommended to mix 70% topsoil with 30% organic compost.
If you're looking to install new lawn, it's recommended to apply approximately 6 inches, but for garden beds and areas to plant crops, 12 inches or more should be used. Overall, the amount of topsoil needed depends on the length and width of the space and the purpose of the land.
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