Eutrophication L.O. 1) Know that this is a problem caused by too much nitrogen! 2) Be able to describe who it causes problems for. Eutrophication • Death of aquatic life caused by increased nitrate levels in water • Nitrates can come from two sources - Artificial fertilisers used by farmers - Nitrates from animal waste (faeces and urine) or feed ( silage) EUTROPHICATION – How it works 1. Farmers put too much fertiliser on the land and it runs into water ways. 2. Fertiliser causes water plants to grow. 3. Plants become overcrowded and die. 4. Micro-organisms feeding on dead plants use up all the oxygen. 5. Other organisms (fish) in the water die. Jaws • In the stream in Mrs Swinson’s garden a trout called Jaws was washed in in one flood • He lived there for a year growing larger and larger • Just when Mr Swinson was contemplating buying a fishing rod _ early June • The stream went cloudy brown • The next morning Jaws was floating belly up- and all the little fish in the stream too • Why?? Jaws This is the constant cycling The Nitrogen Cycle of nitrogen through the atmosphere, soil and living organisms. It shows us that the matter (nitrogen) is recycled and not destroyed. Nitrogen makes up most of the air we breath but we cannot use it this way. We use nitrogen that we get from plants and meat in the form of protein. Plants can make nitrogen into a form we can process. Root nodules • These are nodules which form on the roots of plants. • They contain micro- organisms called Rhizobium. • These bacteria help the plant take up nitrogen. Questions on the nitrogen cycle Use your diagram from last Friday You need not copy the questions just answer in full sentences!! 1. Nitrogen makes up 79% of the air we breath. Can we breath it in? 2. Where do we as animals get it from? 3. In what form do we obtain our nitrogen from this other source? 4. How do we, as animals, loose nitrogen? 5. Name two other ways nitrogen is added to the soil. 6. Name two types of bacteria involved in the nitrogen cycle. 7. Why do farmers add nitrogen compounds to their land? 8. What are the problems with adding nitrogen compounds to agricultural land? 9. Are there any natural ways of boasting nitrogen compounds in the soil?
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