Some Boston University (B.U.) students, upset over an $1120 increase in tuition and fees for next year, may refuse to pay their term bills until university trustees fire B.U. President John R. Silber, a student spokesman said yesterday.

The students would instead deposit their payments for next year's tuition and fees into a special account where the money would be held pending the firing of Silber, Robert E. Anderson, a delegate to the College of Liberal Arts forum, said yesterday.

The students have contacted an attorney to discuss the proposal, he added.

Robert C. Bergenheim, B.U.'s vice president for labor and public relations, said yesterday students will be allowed to enroll in B.U. only if they have paid their tuition directly to the university. "I don't think any university in the world would" allow students to pay into the suggested trust fund, he added.

Unionizing

About 400 B.U. students rallied Wednesday in front of the student union to protest the increase, which raises total costs to $8120.

About 20 picketers stood outside a trustees' meeting all day Thursday, trying to get the trustees' attention, but most entered through a back door and none stopped to talk, Anderson said.

Also, at Wellesley College, about 100-150 students rallied Wednesday to protest an $1140 increase in total costs for next year, Sallied Ballantine, a rally organizer, said yesterday.

The students sang parodies of traditional Wellesley songs and cheers, Ballantine said.

John W. Hartley, Wellesley's vice president for financial and business affairs, said rising fuel costs and the effects of inflation prompted the increase in tuition and fees.