This was Prince George's County Day for Republican gubernatorial candidate Robert A. Pascal. "We're doing the whole nine yards," one campaign staffer said in describing yesterday's agenda.

There was a motorcade: Three maroon Oldsmobiles. There was a rented trolley car and a "demonstration" by supporters when Pascal showed up for his luncheon speech. There was Democratic Lt. Gov. Samuel W. Bogley, appearing at lunch as a show of public support for Pascal. There was a high-brow, $1,000-a-couple Capital Centre fund-raiser in the evening, expected to raise $50,000, featuring Pascal and Robert Dole, Senate Finance Committee chairman.

There were walkie-talkies -- at a cost of $1,500 apiece -- into which staffers talked most of the day: "This is Boland, come in Marinelli. Do you copy?" "Marinelli. Roger. Copy."

The whole nine yards began with an hour-long breakfast meeting at Michael's Restaurant in Landover where Pascal addressed about 30 minority businessmen. Then, the candidate retreated to a hotel for a couple of hours of R&R.

From there, it was onto the lunch at the Lanham Ramada Inn where Pascal spoke to about 150 businessmen who paid $12 each to eat dry roast beef. As always, he ignored the five-page speech that had been written for him but did make some new points, most notably on the controversial topic of waste sewage treatment. He called for, "innovative ways," to deal with the problem, saying the state had to take a hand in helping local governments with future expenses.

One of those listening to Pascal at lunch was Bogley, who said last week he will support Pascal in his bid to unseat Gov. Harry Hughes, Bogley's running mate four years ago. It was Bogley's first campaign appearance since he and Baltimore Sen. Harry J. McGuirk were soundly defeated in the Democratic primary two weeks ago.

Bogley also said he would be delighted if Pascal as governor were to offer him a job in his administration.

While Bogley talked, Pascal went upstairs to film a portion of a new television commercial. In it he holds a stopwatch to remind people that time is running out on Maryland. Pascal denied that the commercial was a take-off on a similar commercial McGuirk did during the primary.

The commercial finished, Pascal cooled his heels for a while. The reason: His advance people had scheduled a 2:30 p.m. stop at the University of Maryland's football practice. The Terps do not start practice until 3:30 p.m.

So, Pascal's first campus stop was at the student union, where he addressed 18 members of the College Republican Club. There, he criticized the Reagan administration's Reduction in Force policy regarding federal workers.

"The way to cut back is by attrition, not by layoffs," he said, marking one of the first times Pascal has taken a stand on the president's policies during the campaign.

Then, the motorcade wheeled down to the practice field where Pascal, who played halfback at Duke in the 1950s, shook hands and posed for pictures with Coach Bobby Ross.

Finally, Pascal, at the behest of photographers, threw several wobbly passes. After that it was back to the hotel for about two more hours of R&R.

The last stop was at the Capital Centre fund-raiser. All told, Pascal probably came in contact with about 300 registered voters.

"I hope this puts an end, a final end, to reports in the Washington metropolitan area papers that we don't have any support in Prince George's County," Pascal told the 150 people at the Capital Centre fundraiser.

While Pascal was wooing Prince George's, Maryland Gov. Harry Hughes was in Montgomery County at a fundraiser in his honor at the home of former Acting Gov. Blair Lee III, whom Hughes defeated in the 1978 Democratic gubernatorial primary. Hughes, who mingled with 80 guests, each of whom paid $100, told the crowd: "thank you for the 84 percent in the Democratic primary. That's great."