Organic fertilizers are broad ...

Organic fertilizers are broad spectrum containing at least 20 nutrients (and often more). things like manure, compost and green manures add organic matter to the soil and feed the life that lives within the soil (healthy soil should have around a billion critters per teaspoon). Other ferts such as hard rock phosphate are not broad spectrum and add certain nutrients nutrients to the soil over a very long time (15 to 20 years in the case of this example)