There are definite and scientifically proven effects of fertilisers on lakes.
The purpose of fertilisers is to expedite crop growth in order to yield more crops. These fertilisers contain minerals that serve this very purpose, including potassium, nitrogen and phosphorus. Despite being helpful in that they multiply crop yields, they also create a side-effect problem known as 'eutrophication'.
This is the effects of fertiliser on lakes.
The reaction of an acid and an alkali together is usually the cause of most chemical fertilisers' sideeffects.
This problem, known as eutrophication, occurs when fertilisers are washed into rivers and lakes by rain water. To break it down further, the upsurge of nitrates and/or phosphates in the water promote the growth of algae, which inadvertently creates a bloom over the water surface.
Due to this, there is a prevention of sunlight getting through to water plants, which will ultimately die without it. The bacteria created also feeds on the dead plans and absorbs all the oxygen in the water, leaving the lake utterly lifeless. These are the common effects of fertilisers on lakes and rivers.