Use of Synthetic Fertilisers Often Leads to the Contamination of Groundwater

question 19

Multiple Choice

Use of synthetic fertilisers often leads to the contamination of groundwater with nitrates. Nitrate pollution is also a suspected cause of anoxic "dead zones" in the ocean. Which of the following might help reduce nitrate pollution?

• A) growing improved crop plants that have nitrogen-fixing enzymes
• B) adding nitrifying bacteria to the soil
• C) adding denitrifying bacteria to the soil
• D) using ammonia instead of nitrate as a fertiliser

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