Fertilizers come in many forms and not all of them are harmful to the environment. When people talk about fertilizer being bad for the environment they are usually referring to the fact that it is often times made with petroleum products a non-renewable resource. Also in many places the fertilizer gets washed away from its intended area and ends up in streams, lakes, and the ocean upsetting the balance of nutrients. (In terms of ecology the influx of nutrients can change the environment from a top down regulated environment to a bottom up regulated environment). In this case it isn’t the actual chemical that is the problem it is the excess of nutrients (specifically nitrogen, phosphorus and potassium)
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