Utah State University Extension
The importance of rotating out of a declining alfalfa stand is well established. As the alfalfa stand ages, forage yield and quality decline, while weed, insect, and disease pressures increase. Terminating the stand and growing one or more other crops for several (2–3) years allows a grower to press the reset button on a piece of ground. These years of growing another crop will result in more productive alfalfa when a new stand is planted again.
Creech, Earl; Yost, Matt; Cardon, Grant; Ransom, Corey; and Clark, Jason, "Considerations for Crop Rotation from Alfalfa to Corn" (2020). All Current Publications. Paper 2100.