TY - JOUR AU - Marr, James C. TI - Sinkholes in irrigated fields: Soil-covered, debris-filled channels of former streams may be one cause of fall-outs during irrigation in certain areas JF - California Agriculture JO - Calif Agr Y1 - 1955/11/01 VL - 9 IS - 11 SP - 6 EP - 7 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v009n11p6 AB - Sinkholes—crater-like openings, sometimes as big as 10' to 15' across and 10' to 12' deep—that suddenly appear in fields during irrigation not only waste water and make farming difficult but—most serious—are a hazard to machinery and operators.