Which is not an advantage of synthetic fertilizers? ease of application?

 Fertilizer that are synthetic  it is fertilizer made commercially, normally using fossil fuels usually known as inorganic fertilizer; broad-spectrum pesticides:

·         are likely to kill the benefits insects

·         are only produced synthetically

·         do not cause increased pesticide resistance

·         are almost always nonpersistent

·         are banned in the United States

answer: that would be cheating

explanation: