Midsummer Deficit Irrigation Of Alfalfa As
A Strategy For Providing Water For
Water-short Areas
Author(s)
B. Hanson, K. Bali, S. Orloff, H. Carlson,
B. Sanden & D. Putnam
Abstract
Alfalfa is California’s single largest agricultural water user due to its large
acreage and long growing season. As a result, interest exists in midsummer
deficit irrigation (no irrigation in July, August, and September) of alfalfa in
water-rich areas to provide water for water-short areas with the amount of
transferred water equal to the difference in the evapotranspiration (ET) between
fully-irrigated and deficit irrigated alfalfa. However, little data exists on the ET
of midsummer deficit-irrigated alfalfa. Commercial fields were selected for
fully-irrigated and deficit-irrigated irrigation treatments of alfalfa. The fullyirrigated
alfalfa was irrigated according to the irrigator’s normal practices. The
deficit irrigation treatments were no irrigation in July through to September.
Alfalfa ET was measured using the eddy covariance and surface renewal energy
balance methods. Deficit irrigation of alfalfa during the midsummer reduced
both ET and yield. The amount of reduction, however, was very site-specific.
The Davis site showed the largest reduction in ET (198 mm), while the other
sites showed much smaller reductions (5 to 62 mm).
Keywords: alfalfa, evapotranspiration, irrigation.
Keywords
alfalfa, evapotranspiration, irrigation.
Related Book
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