DES MOINES, Iowa (AP) — State labor officials say Iowa’s unemployment rate dipped to 5.2 percent in March, with the strongest gains in construction and manufacturing and the biggest losses in trade, transportation and utilities and retail trade. February’s rate was 5.3 percent. Iowa Workforce Development says Friday the state lost 1,600 jobs in March over February, but had over 13,000 more jobs than in March 2011. Officials say manufacturing has led all sectors over the past year, and construction appears to be rebounding. Government and professional and business services have lost jobs over the year. The U.S. unemployment rate for March was 8.2 percent.