Each one is important for a specific reason. Organic Matter Content is the measurement of carbon-based materials in compost. Being aware of a product's organic matter content may be necessary for determining compost application rates on specific applications. Particle Size measures the amount of compost meeting a specific size. A compost product's particle size may also determine its usability in specific applications.
Stability is the level of biological activity in a moist, warm, and aerated compost pile.
Unstable, active compost demands nitrogen when applied to soil. This can cause nitrogen deficiency and can be detrimental to plant growth, even causing death to plants. Specific plant species can flourish when grown within a specific pH range, and based on typical compost application rates, it is understood that the addition of compost can affect the pH of soil. Soluble Salts concentration is the concentration of soluble ions in a solution, which is measured by the ability of a medium to conduct an electric current. Excess soluble salts can actually discourage plant growth.