One of the most common questions I get at the Cache County Extension Office is âhow can I improve my pasture?â Some of my common responses include: changing grass pasture species, utilizing better noxious weed strategies, increasing nitrogen fertilization, and improving grazing management. While these responses will all help improve pasture, there is another recommendation I like to give. Research has found that interseeding legumes into existing pastures can be a very beneficial practice and can help increase the sustainability of current pastures. Why interseed legumes? Advertisement Legumes are able to take nitrogen from the air (an unusable form) and convert it to a usable form available to plants in the soil. This process happens through a symbiotic relationship that plants form with rhizobium bacteria. By interseeding legumes into an existing pasture, you are increasing the amount of available nitrogen in your pasture system. This means less fertilizer has to be utilized each year, and pasture quality and yield increases. Research has also found that legumes will help pastures maintain higher quality and yield even into the heat of summer, when pasture grasses tend to start dipping in both categories.