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Fertilisers Today, when farmers harvest their crop, they remove some crucial nutrients from the soil. Fertilisers replace many of these nutrients, and also increase the amount of certain chemicals such as nitrogen and phosphate. This allows the plants to grow more healthily. There are too types of fertiliser, organic and inorganic. Out of these two, organic is most frequently used because it is relatively cheap to purchase and very easy to apply. Inorganic fertilisers are highly soluble which allow the plants to easily take it up. However because this fertiliser is so highly soluble it can be readily leached into the waterways surrounding the fields. This can eventually lead to a process known as eutrophication. When these chemicals leak into rivers and lakes they fertilise algae and allow bacteria to grow. When