Voting in the vast rural area around the town of Lupane, some 600 kilometres west of Harare, had been marred by allegations by the opposition Movement for Democratic Change (MDC) of vote-buying and intimidation.
The MDC also said two of its members were abducted and tortured.
It said Saturday that Mugabe's Zimbabwe African National Union -Patriotic Front (Zanu-PF) was involved in vote buying through the sale of cheap maize.
MDC spokesman Paul Themba Nyathi on Sunday said village heads were recording the names of people casting their votes in at least half of the polling stations.
He said the village heads, who were often involved in the identification of beneficiaries for relief food, were being used by the Zanu-PF government "to threaten people into voting for it."
Two MDC activists, allegedly abducted and tortured by ruling party supporters on Thursday and arrested when they made a report to police on Friday, were meanwhile still in custody at Lupane police station late Sunday, MDC information official Nkanyiso Maqeda told AFP.
MDC lawmaker David Mpala won the seat in the 2000 general elections. He died in February, allegedly of torture wounds.
Voters in the Lupane district were part of the electoral force that won the fledgling MDC nearly half of all the 120 contested seats in parliamentary elections in 2000.
But the opposition has since lost ground, losing five of its original 57 seats to Zanu-PF, which has increased its parliamentary majority to 66.
Results of the two-day poll were expected late on Monday.
If the ruling party wins the Lupane seat it would only need another three seats to have a majority to change the country's constitution in parliament. - Sapa-AFP
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