Fertilizers: Why Not?

I explained this today to a homeowner and they found it informative so maybe you will too. Why should you think twice about fertilizers ? Okay so plants need 4 things in good supply (other than water and light). 1) Nitrogen: comes from the air but plants need special bacteria and special nitrogen-giving plants around to use it. 2) Sulphur: only present in good supply when it’s friend nitrogen is around 3) Phosphorus: the amount available depends on how many mushroom “mycelium