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BUENOS AIRES, March 26 (Reuters) - The Argentine peso slumped to a five-month low on Wednesday as a two-week-old strike by farmers slashed dollar inflow from agricultural exports.

Bonds also slid as perception of political risk in Argentina rose due to the strike, but stocks shrugged off the news.

The strike against a government tax hike has disrupted grains and other exports, causing some companies to declare force majeure on Argentine soy shipments.

In informal trade between foreign exchange houses, as measured by Reuters, the Argentine peso <ARSB=> weakened 0.47 percent to 3.1900/3.1925 pesos per dollars, the weakest close since Oct. 31.

The peso <ARS=RASL> also depreciated 0.24 percent to 3.1675/3.1700 per dollar in formal interbank trade.

"Amid an agitated day due to news about the farmers strike, the exchange market was clearly buying and forced the Central Bank to sell dollars at 3.17 (pesos) to slow down the weakening of the currency," said Fernando Izzo, an analyst at ABC Market Exchange.

In recent years windfall profit from high-priced soy and other grains exports has meant a flood of dollars into Argentina and the Central Bank usually buys up dollars to keep the peso weak, keeping the country's exports competitive globally.