Nitrogen Cycle
Biology: Edexcel IGCSE, topic 5.1.20
Nitrates in Farming
Farmers may want to provide extra nitrates for their crops by adding fertilisers (manure) to the soil. They can also use plants with root nodule bacteria to add nitrates back into the soil; this is called crop rotation.
Test yourself on Nitrogen Cycle
Which of these are not involved in the nitrogen cycle?