In nature, plant nutrients are replenished over thousands of years through by the decomposition of dead plants and animals. This is slow process that has been severely impacted upon by today’s modern world
The nutrients utilized by plants need to be replenished.
Plant growth is reduced when soil nutrients are reduced and as such we need to replenish the nutrients to maintain and enhance plant growth.
Soils vary and plant requirements vary. To ensure you get the best plant growth you need to ensure all plant elements are available to the plant.