5 disadvantages of fertilisers

1)Fertilisers are costly.

2) Continuous use of fertilizers in an area can destroy soil fertility because the organic matter in the soil is not replenished.

3) The naturally occuring soil micro-organisms are harmed by the fertilizers used.

4) Sometimes fertilizers get washed away due to excessive irrigation and are not fully absorbed by the plants. This excess fertilizer then leads to water pollution.                                                                     5) Their addition can have harmful effects on the soil such as soil acidification, persistence of toxic organisc compounds and accumulation.                                                                                              6) The use of fertilizers on a global scale emits significant quantities of greenhouse gas into the atmosphere.