USDA REVISES 1986 SUMMER POTATOES The U.S. Agriculture Department made the following revisions for 1986 crop summer potatoes -- Production -- 21,003,000 cwt (100 lbs), vs 20,900,000 cwt estimated previously. Acreage for harvest -- 95,700 acres, vs 95,800 acres estimated previously. Yield per harvested acre -- 219 cwt per acre, vs 218 cwt per acre previously estimated, the department said.