Not all organic soil types are created equal. Just because a soil is organic, you cannot count on it being suited to grow your particular crop. For this reason, organic soil needs to be enriched in the same way as normal soil. However, in the case of organic soil, you have the option of using different organic enzymes in order to get that job done.
Big Three Enrichment
The most common type of enrichment that occurs with organic soil is "big three enrichment." The big three are nitrogen, phosphorus and potassium (sometimes calcium gets included). Because organic soil is a lot less predictable than inorganic soil, you will find that the mixture of these nutrients has greater variation than it would with conventional potting soil.
The use of enzymes can correct any of the soil nutrient imbalances that exist within the organic soil. The enzymes will interact with the bacteria in the soil, causing them to consume more of one nutrient type and release more of the other from areas in the soil where nutrients can be locked in. This increases the effective utilization of nutrients in the soil, thereby giving you a better future yield.
Another thing that enzymes in organic soil can do is improve the hardiness of the plants growing in it. Largely, this has to do with the presence of certain trace elements in the soil such as iron, calcium and magnesium. Once again, you can use straight fertilizer in order to accomplish this, but in many cases organic enzymes are going to be a cheaper option.
When more of these materials are available within the organic soil, the root structures of the plants are able to absorb more. This in turn helps those plants resist pests better and allows them to grow in harsher conditions. This is especially useful for places in the world that tend to transition quickly from the summer-fall period to fall-winter, such as Canada and the northern United States.