Adjusting nutrient levels in your soil can be done many different ways with many differentsoil amendments. Most soils need some kind of balancing with either macro or micro nutrients at some point in it's lifetime. Knowing that organic growers need a broad choice of amendments at reasonable prices has lead us to curate an ever growing range of organic soil amendments.
As soil testing has gained popularity in the natural soil market, the need for natural and organic products to make adjustments has grown. Back in the day organic farmers thought all you had to do was add animal manure compost every year for a healthy soil. We now know there is a lot more to it than that, and adding to much compost can actually be detrimental and cost prohibitive.
Depending on your type or style of growing there are many different ways to factor in what amendments would be best for your particular soil situation. The obvious first choice is to get a soil test from a reputable lab, and base your needs off of that. That being said, there are instances where a soil test isn't necessarily needed, and you can use the environment and the plant to help guide you.
Building organic matter is key to a healthy organic soil. There are many methods and reasonings why people do what they do to buildup organic matter, but it is essential to the longevity of a balanced soil. Adding in rock dusts, straw, compost, wood chips, etc.. are all ways to increase organic matter and the microbiology in your soil. If you are new to this type of growing talking with others in your area, or your industry may give you insight as to what works locally.
Balancing soil nutrients, organic matter, ph, ec, etc.. isn't going to happen overnight, but with persistent work turning even the roughest,dried up leached soil into deep black rich productive soil is possible, with the right products and know-how.