Answer :

Scenario that will most likely result in a change to the nitrogen cycle that negatively affects plant growth: soil acidification.

What is the affect of soil acidification on nitrogen cycle?

The process of soil acidification, which results in a reduction in soil pH over time and can influence both surface soil and subsurface, is sped up by agricultural activity.      

The supply of nitrogen may be decreased if beneficial soil microorganisms are prevented from recycling nutrients. In addition to possible calcium, magnesium, and molybdenum deficits, phosphorus in the soil becomes less available to plants. It may become more difficult for plants to use moisture from the soil.

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