Farmlands OF southwestern Fresno County are in great need of ground water recharge. Most irrigation pumping occurs from below a confining layer of diatomaceous clay, 500 to 700 feet below the ground surface. However, a shallow water table is perched on layers of heavy-textured sedimental soils occurring 75 to 100 feet below all the experimental locations. This zone of water is not pumped for irrigation purposes at present because of high salinity.

This report is a contribution from the Soil and Water Conservation Research Division, Agricultural Research Service, U. S. Department of Agriculture, in cooperation with the California Department of Water Resources and the California Agricultural Experiment Station.