Yellow peas have become a large volume crop in Saskatchewan in recent year. Yellow peas are valuable as an annual legume in crop rotations because they provide breaks in disease cycles that affect the major cereal and oilseed crops. They also provide a diversified source of farm income. An important feature of peas, as of other legumes, is their ability to fix nitrogen from the atmosphere in association with bacteria known as Rhizobia, thereby reducing the requirement for nitrogen fertilizer.