California Agriculture

We conducted 4 years of irrigation experiments in garlic on the West Side of the San Joaquin Valley to determine appropriate irrigation frequency and cutoff dates as well as the effect of irrigation on yields for crops grown in sandy and clay loam soil. In sandy soil with the moisture content at field capacity prior to the rapid growth stage, yield was strongly dependent on applied water, and weekly irri-gation was needed for maximum yield. In clay loam, yield did not depend on applied water because the garlic plants were able to ex-tract sufficient soil moisture to offset deficit irrigation. Irrigation cutoff in both soils should occur by mid-May.