But economists expect that trend to moderate soon, as businesses bring inventories in line with slower sales. That should allow production to decline at a slower pace in the current quarter.

Still, the drop in March was steeper than expected. The Federal Reserve said production at the nation's factories, mines and utilities dropped a seasonally adjusted 1.5 percent, matching February's decline and worse than the 1 percent decline analysts forecast.

Factories and mines are increasingly idle, as the total industrial capacity utilization rate fell to 69.3 percent from 70.3 percent, the lowest on records dating to 1967.

Industrial production fell at a 20 percent annual rate in the first quarter, the Fed said, the sharpest quarterly downturn of the current recession. The drop will contribute to another steep contraction in the overall economy in the January-March period that economists estimate will be in the 4 to 5 percent range. The nation's economy shrank 6.3 percent in the fourth quarter of last year.

Some analysts expect industrial production to fall at a rate of less than 10 percent in the current quarter, as the economy's contraction slows.