The fertilizer could runoff and pollute nearby water sources.
Explanation:
In the past several decades, the agriculture has changed significantly, as the methods for work, production, fertilization, have all changed in order to have maximum benefit. One of the most used things in the agriculture are the fertilizers, with their purpose being enriching the soil so that it can support more plants, and also to make them produce more in quantity. While in general this has good results when it comes to the crops, it also brings in some problems.
One of the most common problems is that the fertilizers runoff or wash through, and manage to get to the nearby water bodies. They over saturate the water with nutrients, causing eutrophication. This causes large scale growth of weeds and algae, and the algae rapidly cover the surface of the water body, blocking the sunlight, and extracting the dissolved oxygen from the water, thus systematically killing of the other organisms.
The elements most commonly used for fertilizing are:
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