Carter administration bumbling led to the crises in Iran and Afghanistan, and the trouble has only begun, Republican platform drafters were told yesterday.

"For three years, American policy has been sowing the harvest that we are reaping today in Afghanistan," said Fred Ikle, director of the U.S. Arms Control and Disarmament Agency under Presidents Nixon and Ford.

"And this is only the first installment," Ikle said. "The passive and indiffernt attitude of the Carter administration toward the political color of the world map has provoked an accelerating erosion of the realm of freedom."

Ikle was one of several witnesses criticizing President Carter's foreign policy as the GOP platform committee concluded the first round of a six month platform-writing process.

Herbert Stein, who was Nixon's chief economic adviser, said Carter is largely to blame for the country's economic woes.

"The current inflation did not begin with the Carter administration," Stein said. "There can be no doubt, however, that the policies of the Carter administration have not only failed to reduce the inflation rate but have actually made it worse."

Stein called for a stiff austerity program with tighter money and a sharp curtailment of the growth of government spending. He said this may mean forgoing some popular government programs and passing up a tax cut, and probably the loss of some jobs and profits.

Bill Brock, GOP chairman, questioned the practicality of Stein's bitter-pill approach in an election year..

"I don't think you can convince the people in this country that you are going to solve inflation by putting people out of work," Brock said.