Adding nitrogen to soil can help increase the amount of forage legume plants grown, but this depends on factors like temperature, soil type, and how the plants are planted. A study looked at different research to see how nitrogen affected forage legume growth. They found that adding nitrogen generally made the plants grow more, especially in pure stands. The amount of growth depended on factors like temperature and soil quality. In some cases, adding nitrogen didn't make a difference or even made the plants grow less. So, when deciding whether to add nitrogen to grow forage legumes, it's important to consider the environment and planting method.