Thoroughbred racing is expected to resume at 12:30 p.m. today at Laurel following the cancellation of yesterday's card because of potentially hazardous track conditions.

Three tractors equipped with harrows worked on the main strip yesterday and were successful, by 1 p.m., in breaking up the clods of dirt that had formed overnight when the temperature dropped sharply to 20 degrees.

The strip had been muddy or sloppy for 13 straight programs.

Frank Brady, Laurel's general manager, explained the reason for yesterday's cancellation.

"We had a forecast this morning at 6 o'clock that the temperature might reach 34 degrees by noon, which might have allowed us to run," he said. "However, a later forecast indicated that it might not get past 30 degrees, and I felt it would be a very chancy situation and asked the stewards to cancel."

The steward's decision was announced shortly before 9 a.m. Many fans came to the track, however, unaware that there would be no racing.

"It looked like a nice day to me. The sun was out, and everything," said Sandra Walker of Columbia, Md. "I'll be five other cars drove into the parking lot right behind us, shortly before the time for the first race, only to be disappointed."

Wednesday's nine-race program has been scrapped. The card drawn Tuesday will be presented today. Entries were taken yesterday for Friday.