The judge presiding over Michael K. Deaver's perjury trial agreed yesterday to dismiss several elements of one count against the former White House aide, but left intact the major charges in a five-count indictment alleging that Deaver lied about his lobbying.

Over objections from defense lawyers, U.S. District Court Judge Thomas Penfield Jackson declined to rule on their motion for acquittal. The judge's decision apparently will allow the case to go to the jury as early as Friday containing all the specifics that prosecutors wished.

The decision also means that Deaver's lawyers will have to deal with allegations remaining in the case that the judge has expressed misgivings about Deaver's lawyers will not be able to quote those remarks in their closing arguments, however, because the judge's comments were made while the jury was out of the courtroom.

During a brief session yesterday morning, Jackson agreed to joint requests by prosecutor Whitney North Seymour Jr. and chief defense lawyer Herbert J. Miller Jr. to strike several aspects of the case dealing with Deaver's role in seeking to resolve a dispute with Canada over acid rain.

As expected, the judge struck a section of the indictment accusing Deaver of failing to recall a luncheon meeting he had in January 1985 with Allan E. Gotlieb, Canadian ambassador to the United States.

Seymour had acknowledged last summer when he failed in a controversial bid to subpoena Gotlieb that he would have difficulty proving that Deaver had lied about the luncheon. The prosecutor's hopes for proving that charge collapsed Monday when Deaver's lawyers, in a surprise move, announced they would offer no defense. That prevented the prosecutor from using testimony from Deaver or any of his witnesses.

Seymour said yesterday he wanted the record to show that the charges were being dropped "not for {his} want of trying" to prove them.

He also agreed to drop from his case an allegation that Deaver discussed the acid rain issue in a March 2, 1985, meeting that included Donald T. Regan, then White House chief of staff, and Robert C. McFarlane, then national security adviser, as well as two of the six dates on which Deaver was allegedly present during discussions of the issue.

Another acid rain issue dropped from the indictment was an allegation that Deaver had "supported the idea of appointing a special envoy" to represent the United States on the issue "from the moment the idea was first proposed on Dec. 17, 1984."

The judge's announcement that he would "reserve judgment" on the motion for acquittal brought an objection from Miller that the judge was committing "reversible error." By reserving judgment, the judge still has the power to overturn the jury's verdict and he does not run the risk of disrupting the case when it is so close to completion, according to several lawyers asked about the judge's decision.

Still left in the case are allegations that Deaver lied when he failed to recall his contacts with Transportation Secretary Elizabeth Hanford Dole and her deputy, James H. Burnley IV, on behalf of Trans World Airlines, two contacts about which the judge has expressed doubts. Deaver is also accused of failing to recall his efforts to get a Korean trade envoy into the Oval Office, various other contacts with White House colleagues, and his work on Puerto Rican tax issues.

Lawyers in the case will return to Jackson's courtroom this afternoon to argue over what the judge should say in his instructions to the jury. Final arguments will begin Thursday.