The specific amount of compost that soils need is a function of the nutrients they are lacking and the condition and the texture of the soil. Testing your soil can help determine its condition and needs. The nutrients available in compost are a direct function of the raw materials that were used to create it. A rule of thumb is to work one to two inches of compost into the top 3 to 5 inches of soil.
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other ways to recycle food scraps
sample soil test