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HUMAN IMPACT ON NUTRIENT CYCLING Humans directly and indirectly affect nutrient cycles. An example of this could be the grazing of land. The livestock provide nutrients in the form of faeces and urine, which are decomposed into humus by the secondary decomposers. These nutrients are lost when the animal is removed. Similarly, if the land is over used by arable farmers, without nutrients being replaced then the soil becomes more and more barren. Farmers have to artificially supply nutrients into the soil in the form of organic matter and fertilisers. Farmyard manure, (FM) helps soil particles, peds, to stick together to form soil structures. It also has surfaces which can attach nutrients and hold water which could have been lost via leeching. Nitrogen is one of the most commonly added of fertilisers to arable land. Nitrogen can be converted into amino acids, then protein to be used in the construction of cells...

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