Question

what are ways in which nitrogen can be added to soil

Answer 1

Answer:

a molecule of nitrogen may enter the soil system as organic-N from crop residues or other plant or microbial biomass, from animal manures or organic wastes (for example, sewage sludge or food processing residues), and through the action of leguminous plants such as alfalfa that take nitrogen from the atmosphere and ...

Answer 2

Explanation:

Figure 1 shows that NO3 – can be used by plants, be converted back to nitrogen gas or be leached downward with soil water. Commercial fertilizers, plant residues, animal manures and sewage are the most common sources of nitrogen addition to soils.