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Fertiliser – any substance applied to land to encourage plant growth and produce higher crop yield. Fertilisers made from organic material—such as recycled waste, animal manure, compost, etc.—or chemically manufactured. Most fertilisers contain varying amounts of nitrogen, phosphorus, and potassium. In the United States, it estimated that as much as 25 per cent of fertiliser carried away as runoff. Fertiliser runoff has contaminated groundwater. For example, some farmers use up to 40% more fertiliser than they need. See Pesticides, herbicides

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