The most likely way that Cleo can increase the amount of nitrogen in the soil is by adding several soybean plants to her garden.
How is nitrogen added to the soil?
Nitrogen is a major nutrient of the soil needed by plants for several mechanisms in their metabolism.
Nitrogen is easily added to the soil by planting leguminous plants that are capable of fixing atmospheric nitrogen through the help of nitrogen-fixing bacteria in their root nodules.
According to this question, Cleo has a vegetable garden and wants to increase the amount of nitrogen in the soil. The most likely way that Cleo can increase the amount of nitrogen in the soil is by adding several soybean (legume) plants to her garden.
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