MUMBAI/NEW DELHI - Indian exporters are bracing for disruptions after a US Homeland Security notification confirmed Washington will impose an additional 25 percent tariff on all Indian-origin goods from Wednesday, ramping up trade pressure on the Asian nation.

Indian exports will face US duties of up to 50 percent - among the highest imposed by Washington - after President Donald Trump announced extra tariffs earlier in August after New Delhi's purchases of Russian oil.

The new duties will apply to goods entering the US for consumption or withdrawn from warehouse for consumption from 12:01 am EDT on Wednesday or 9:31 pm IST, according to the Homeland Security notice.

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The Indian rupee weakened 0.17 percent to 87.7275 per US dollar in opening trade, even as the greenback declined against many other currencies.

The notification said exceptions would include in-transit shipments with proper certification, humanitarian aid, and items covered under reciprocal trade programs.

India's Commerce Ministry did not immediately respond to an email seeking comment on the latest notification.

"The government has no hope for any immediate relief or delay in US tariffs," said a Commerce Ministry official, who spoke on condition of anonymity because they were not authorized to speak to media.

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Exporters hit by tariffs would be provided financial assistance and encouraged to diversify to alternative markets, the official added.

"The government has identified nearly 50 countries for increasing Indian exports, particularly of textiles, food processed items, leather goods, marine products."

Indian Prime Minister Narendra Modi has vowed not to compromise the interests of the country's farmers even if there is a heavy price to pay.