The peak daily water use rate of alfalfa will normally range from 0.30 to 0.35 inches. The water requirement is approximately six inches for each ton of hay produced. For optimum growth, maintain soil moisture in the root zone at 35 to 85 percent of the available moisture holding capacity. Schedule irrigations so the soil is not excessively wet at harvest. Monitor soil moisture status and combine with crop water needs, system capacity, and soil available water capacity for effective irrigation management.
Excess water causes diseases, reduced growth rate, and loss of stand.
Kenneth R. Bolen, Director of Cooperative Extension, University of Nebraska, Institute of Agriculture and Natural Resources.