Fertilisers: These are artificial nutrients a farmer can spread on his fields., Applying these chemicals helps give plants the nutrients they need for a high yield., These can wash into rivers and cause eutrophication., Pesticides: These are chemicals that kill pests., They are highly effective at killing pest species and so help to increase yield., These can leave residues on the food we eat and kill helpful insects too!, Biological Control: This is when a natural predator is used to kill pests., This control is very specific to particular pests, so helpful insects survive., This control can be slower than chemical alternatives., Green Manure: This involves using legumes to help fertilise the soil naturally., This also adds useful organic matter aswell as nutrients to improve the soil., These need time and space in a field to grow.,

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