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The Nitrogen Cycle Plants use nitrates from the soil to make proteins. Nitrates get into the soil from decayed faeces, animals and plants. This is why manure helps plants grow. When dead animals or plants, or faeces are decayed by putrefying bacteria, ammonium compounds are released. These contain a lot of Nitrogen. Ammonium compounds are converted to nitrates by nitrifying bacteria. Nitrates can be easily absorbed by plants that use them to make proteins. The cycle where nitrogen is moved from the soil, into organisms and back again is called the Nitrogen Cycle. The Nitrogen Cycle 4. Nitrifying bacteria convert ammonium compounds into NITRATES 1. Plants absorb nitrogen in the form of NITRATES Nitrates in the soil Waste and dead animals Plants Animals 3. Microbes break down waste products and dead animals and plants to form AMMONIUM COMPOUNDS 2. Plants are then eaten by animals – the nitrogen becomes PROTEIN