Rhodesian nationalist leader Bishop Abel Muzorena called yesterday for independence under black rule in Rhodesia in a year and a day.

He reminded 3,000 delegates at a congress of his United Africa Naoaitln Council here that Sept. 12 is Settlers' Day, when white Rhodesians commemorate the arrival of the first whites 90 years ago Muzorewa told his audience it "is a holiday for whites rejoicing in the day they colonized you and me," and urged that Sept. 12, majority-ruled Zimbabwa - the black nationalist name for Rhodesia.

In other developments:

It was announced in Salisbury that Rohodesian Prime Minister Ian Smith would visit South Arfica Monday for talks with Prime Minister John Vorster. It will be Smith's second meeting with the South African leader in two weeks.

Leaders of South Africa's colored (mixed race) Labor Party met a Stellenbosch, near Cape Town, an drejected government proposals for a new constitution that would give the colored and indian communities their own parliaments. Party officials said the plan would only entrench apartheid, the government policy of racial segregation.

Zambian President Kenneth Kaunda accused Rhodesia of dropping napalm bombs that killed two Zambian soldiers and injured five persons in the Feira District, and of sending sabotage squads into his country.