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Amendments are mixed into the soil. A soil amendment is any material added to a soil to improve it’s physical properties, such as water retention, permeability, water infiltration, drainage, aeration and structure. The goal is to provide a better environment for roots. To do its work, an amendment must be thoroughly mixed into the soil. If it is merely buried, it’s effectiveness is reduced, and it will interfere with water and air movement and root growth.
A soil amendment is any material added to a soil to improve its physical properties, such as water retention, permeability, water infiltration, drainage, aeration and structure. The goal is to provide a better environment for roots.
To do its work, an amendment must be thoroughly mixed into the soil. If it is merely buried, its effectiveness is reduced, and it will interfere with water and air movement and root growth.
Amending a soil is not the same thing as mulching, although many mulches also are used as amendments. A mulch is left on the soil surface. Its purpose is to reduce evaporation and runoff, inhibit weed growth, and create an attractive appearance. Mulches also moderate soil temperature, helping to warm soils in the spring and cool them in the summer. Mulches may be incorporated into the soil as amendments after they have decomposed to the point that they no longer serve their purpose. |
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There are two broad categories of soil amendments: organic and inorganic. Organic amendments come from something that is or was alive. Inorganic amendments, on the other hand, are either mined or man-made. Organic amendments include sphagnum peat, wood chips, grass clippings, straw, compost, manure, biosolids, sawdust and wood ash. Inorganic amendments include vermiculite, perlite, tire chunks, pea gravel and sand.
Inorganic soil amendments are used to supplement the organic matter that is already in the soil. It is meant to improve the texture of clay soil, and help sandy soil by increasing the sandy soil’s capacity to retain water and nutrients. In a nutshell it is meant to make clay soil and sandy soil more like loam soil in texture and character. Vermiculite/ Peat, and perlite are examples of inorganic soil amendments. Both are used to improve the water and nutrient retention of the soil. Vermiculite/Peat and perlite are usually used on small scale in potting soils and small plant beds.
Organic amendments increase soil organic matter content and offer many benefits. Organic matter improves soil aeration, water infiltration, and both water- and nutrient-holding capacity. Many organic amendments contain plant nutrients and act as organic fertilizers. Organic matter also is an important energy source for bacteria, fungi and earthworms that live in the soil. |
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Did You Know? |
• Clay soil takes longer to saturate and requires less frequent watering.
• Sandy soils drain quicker and need to be drained more often.
• Soil is a mass of mineral particals mixed with air, water, living and dead organic matter.
• Compost piles are a great way to recycle yard and kitchen waste to be used as a soil amendment.
• Clay silt and sand are the three main types of soil. It takes more than 500 years to form 2cm of top soil.
• Just one gram of soil contains 5000 to 7000 different species of bacteria. |
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