Fertilisers in Agriculture 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelAQA Created by: GEEKGIRL98Created on: 09-10-15 19:00 Use of artificial and natural fertilisers Make plants grow more Increases productivity=more profit Cost/benefit analysis needed NPK fertilisers- Nitrogen, Phosphorus, Potassium Nitrogen is needed for protein formation One mineral is not sufficient Other elements included Ammonia becomes ammonium ions, then nitrites through nitrification Then become nitrates Taken up by active transport in plant Amino acids are made, so proteins are formed Leads to growth of plant Leaves grow, so more glucose can be made through photosynthesis Used to produce organic substances, increasing productivity 1 of 3 Fertilisers in Agricultural ecosystems Not needed in natural ecosystems Nutrients are constantly recycled Death and decay in nitrogen cycle Saprobiotic micro-organisms act on ammonium compounds in organisms Natural fertilisers=Manure, Bone meal and Dead plants 2 of 3 Process of eutrophication High levels of nitrate causes growth of plants Surface water covered with algae Prevents light from reaching plants Lack of photosynthesis, so plants die Saprobiotic micro-organisms feed on dead plants Rapidly reproduce Use oxygen for respiration Oxygen concentration of water is reduced Aerobic organisms (e.g. fish) start to die- lack of oxygen Saprobiotic micro-organsims release ammonia Nitrifying bacteria convert this to nitrates (oxidation) Anaerobic micro-organisms increase in population-lack of competition Reduction in species diversity 3 of 3
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