Farmers in Argentina have declared their fourth strike in as many months, starting at 0300 GMT Sunday, to protest against tax increases on food exports.
Argentina is one of the world's top exporters of wheat, soya and beef.
A focus of the farmers' anger is an increase in the export tax on soya, which earned $13bn (Ј6.6bn) in 2007.
On Saturday, Argentine riot police broke up a road blockade by protesting truckers and farmers on a main road near the border with Uruguay.
Riot police moved in to clear Route 14, a major road link with Brazil.
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Other highways are still being blocked by angry truckers whose livelihood has been damaged by the ongoing tax dispute.
The truckers' protest has led to fuel shortages and is threatening food stocks in parts of Argentina.
(BBC)
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