- Relying too much on inorganic fertilizer (synthesis chemical fertilizer) – there are several natural fertilizer in the system; rains – contains several nutrients depending on where it came from, weathering of parent material underlying the soils – breaking down of rocks and soils due to the weather which will then become nutrients for plant and Bacteria – they decompose the dead organic matter, which will, then, become the nutrient for plants and they also do a process called “nitrogen fixation” which is a process where bacteria convert nitrogen in the air into ammonia which can be absorbed by plant.