Poland has shut down its Baltic shipyards until after Christmas and warned farmers that it might compel them to speed up food deliveries, as evidence mounted that opposition to the week-old martial-law regime is crippling the country's already ailing economy.

The moves, announced by Radio Warsaw, appeared to contradict other official Polish statements that the country's industry is now working at 95 percent of its normal pace and that the situation has calmed enough to allow the strict nationwide curfew to be lifted in unspecified areas.

Tass, the official Soviet news agency, charged yesterday that "instigators" of Solidarity, the banned independent labor union federation, have trapped 1,300 miners in the shaft of a coal mine near Katowice, but Polish and Western reports from Poland indicated that the miners were staging a sit-in.

United Press International, in a dispatch from Warsaw filed through Polish censorship, said that PAP, the official Polish news agency, "reported 1,300 miners had blown up one shaft and were holed up underground."

Reports reaching Washington indicated that coal miners in the Silesia region were putting up stiff resistance to efforts by Polish security troops to force them to return to work and that several armed clashes had occurred over the weekend. Diplomats in Washington were taking seriously the account of the 1,300 miners being trapped as the result of violence but expressed doubt that Solidarity activists were responsible.

The government yesterday continued to censor reports by foreign correspondents.

There were no direct reports of new violence, but travelers and Reuter news agency said that, according to figures compiled by the Roman Catholic Church in Poland, at least 200 persons had been killed and 1,000 injured in clashes with security forces in Poland since the military seized control of the country Dec. 13.

Reuter said a well-informed Western source who asked not to be identified said he had been told that more than 100 persons had been killed in the mining area around Katowice. Polish authorities have reported only seven dead throughout the country.

Reports from official Polish and Soviet news agencies from Poland gave conflicting pictures of the situation, with the optimistic assessments punctured by reports of specific problem areas.

Tass, quoting Poland's Interior Ministry, said that a "normal working process has been achieved in 95 percent" of Poland's enterprises and that "the number of criminal acts is lessening."

But it said there were still "certain plants where Solidarity instigators and the firebrands of the counterrevolutionary splinter groups continue to create disorder."

Radio Warsaw said shipyards in Gdansk, the Baltic stronghold of Solidarity where serious clashes with police were reported last week, and nearby Gdynia have been shut down until at least Dec. 28. No reason was given.

While Tass reported that Solidarity activists had blown up one of two entrances to one of Poland's biggest coal mines, near Katowice, trapping 1,300 miners, Radio Warsaw said nearly all the coal industry was working normally in the region and 559,000 tons of coal was mined Saturday. This was slightly lower than scheduled but higher than the average of 500,000 tons reported over the previous four days.

Radio Warsaw also said martial-law authorities were purging management in the mining and electrical power industries, and Trybuna Ludu, the official Polish newspaper, said Saturday that "many persons in top positions at various levels have either been recalled from their posts or fired."

The military government also appealed to private farmers to increase food supplies to the population, warning that compulsory deliveries might be instituted if they did not. Private farms account for about 80 percent of Poland's food production.

"We hope that it will not be necessary to introduce compulsory supplies," the appeal, broadcast by Radio Warsaw, said.

Deputy Agriculture Minister Andrzej Kacala repeated the warning to farmers in a television interview yesterday, Dan Fisher of the Los Angeles Times reported in a dispatch filed through military censorship in Warsaw. Fisher also said authorities announced that diesel-fuel sales to farmers -- banned since Dec. 13 along with all fuel sales to private motorists -- have been resumed.

Convoys of trucks carrying emergency food and medical supplies from both East and West continued to arrive in Warsaw yesterday.

A United Press International dispatch from Warsaw, delayed a day by military censorship authorities and possibly altered, quoted the official news media as saying martial law will last as long as necessary, although it has not solved the nation's problems.

UPI said the Polish press listed further arrests of Solidarity union activists on Saturday for defying martial-law regulations. No total of arrests was given, but other reports reaching the West have put the figure as high as 50,000.

ADN, the official East German news agency, said yesterday that several Solidarity officials already have been convicted, in summary proceedings, of attempting to organize strikes. It did not say how many were involved or what sentences they received.

Meanwhile, Radio Warsaw, in a commentary monitored by the British Broadcasting Corp. and published by Agence France-Presse, gave the fullest indication so far of what the Communist Party's immediate role is to be under martial law.

The commentary painted a picture of a party rapidly reconstituting itself under trusted cadres to take the fight for Communist orthodoxy to the countryside.

"Ideological opponents" have not abandoned their efforts against socialism in Poland, according to the broadcast, and under martial law the current tasks of party branches and members "are becoming more important than ever, but also more difficult."

Reports from PAP news agency correspondents, it said, showed that "party members . . . are recovering their proper place in all that is connected with rescuing the state from collapse, and normalizing the situation, particularly in the economic sphere."

One of the party members' main tasks since the introduction of martial law "is to explain the reasons" for "this great and dramatic measure," the radio said.

The following is based on information arriving from Poland:

Poles yesterday packed churches -- the only place where they are allowed to freely assemble under martial law. Archbishop Jozef Glemp, the primate of the Roman Catholic Church in Poland, appealed to his countrymen to remain calm.

Glemp said that peace was essential to safeguard not only Poland's future but also that of the church.

The government is seeking the aid of the church in restoring calm in Poland, where 90 percent of the citizens are Roman Catholic. The church has served as a mediator between Solidarity and the government during impasses in negotiations before the military crackdown.

Some members of the Communist Party have said that if the church emerges as a focus of the opposition to the military, officials will consider a campaign against it.

Church sources have reported that since the military took control Dec. 13, some priests have been arrested, and others have been beaten. The incidents occurred in Wroclaw and Gdansk, where the church has been heavily active in the Solidarity campaigns, the sources said.

But the government did allow two representatives from the Vatican into Warsaw yesterday as part of a diplomatic effort initiated by Pope John Paul II to help restore peace to his homeland.

Polish authorities have also given the church authority to organize a relief operation for activists who have been arrested. Food and clothing are being collected in several Warsaw churchs and given to the Army to be used for the prisoners. Church officials said at least some of the packages have been distributed.

Large camps in the Mazurian Lake District in northeast Poland, near the Soviet border, are used to house the arrested activists. Others are being held in an enclosed arena in Wroclaw.

Many intellectuals and Solidarity activists from the Warsaw area were first imprisoned in Bialoleka, but they were moved because of the deplorable conditions. Temperatures inside the cells were said to have dropped below zero.

The number of prisoners being held by the government is still uncertain, but church sources said they have verified a list of 1,100 people arrested. They estimated the total may be as high as 40,000, however.

"In fact, it's impossible to be certain of any precise figure for the number of detainees," a priest involved in the church's relief operation said. "I doubt even if the government knows for sure."

Some of those who were arrested during the initial days of the crackdown have reportedly been released.

The government, according to Solidarity sources, says 2,600 people are under arrest. But those are probably the people facing long-term jail sentences, the sources said.

Solidarity sources also said that authorities have transferred Solidarity leader Lech Walesa to general staff headquarters in the capital. He was moved from a villa south of Warsaw apparently because his whereabouts were becoming too well know, the sources said.

A Foreign Ministry official confirmed yesterday that an unknown number of workers at the Gdansk shipyard are still barricaded inside a building filled with highly explosive acetylene tanks. The official indicated the authorities would try to wait out the strikers.

Authorities extended the curfew in that Baltic port city for an additional two hours, beginning at 8 p.m. instead of 10 p.m. and lasting until 6 a.m. The curfew was relaxed somewhat in most of the rest of the country except Elblag, Lublin, Katowice, Szczecin and Wroclaw, and Warsaw, all apparent trouble spots.

The capital, blanketed by the heaviest snowfall in two years, remained calm yesterday as the authorities tightened their grip on the population. Pedestrians were frequently stopped for identification checks. The writers' union, journalists' union, actors' club and most student organizations have been closed.