Mrs. Kirchner went on national television again to persuade the farmers to end their 19-day work stoppage. “In the name of all Argentines, I ask you one more time” to “let the trucks through,” she said. “We are open to dialogue.”

She also urged them to “think like you are part of a country, and not like landowners.”

After the speech, the leaders of four major striking farm groups said on television that the government’s announcement had not persuaded them to halt the strike, which they vowed would continue until at least Wednesday.

But the embattled Argentine president continued to refuse to roll back a new sliding scale of taxes on some farm exports that is the focus of the striking farmers’ demands. Small farmers have complained that they have been unfairly singled out by the government’s move on March 11 to raise export taxes on soybeans from 35 percent to as much as 45 percent.

Instead, Mrs. Kirchner joined Economy Minister Martin Lousteau in offering a package of concessions that included transportation subsidies for far-off farms, new credit plans for dairy farmers and the creation of the position of rural under secretary.

She said the export tax increases were intended to help slow rising inflation, which officially topped 9 percent last year. The projections of independent economists were closer to 20 percent.

The strike has caused supermarkets to run short of chicken, beef and produce.

The leaders of the farm groups urged the government to make greater concessions.

Mario Llambias, a farmer and strike organizer, said 400 road blockades would continue across a wide swath of Argentina, from Salta in the far north to the province of Rio Negro in Patagonia, The Associated Press reported.

“We continue to insist that the government doesn’t understand what is at the root of the problem,” he said, according to The A.P., adding, “I believe the president is ill-advised” on farm policy.