The United Nations set up a taskforce in March to facilitate passage of fertilizers through the strait. It is yet to implement the mechanism it drew up, but United Nations Under-Secretary-General Jorge Moreira da Silva said this could be activated within 7-10 days of an agreement between Washington and Tehran.

"It's absolutely crucial to get the deal in the next few weeks. Otherwise, we will miss the planting season," he said in an interview in Bangkok, on the sidelines of the International Monetary Fund and World Bank annual meetings.

In response to questions from Reuters, a US State Department spokesman said the US military has assisted thousands of commercial vessels with transiting the strait.

"The United States will continue to take decisive action against Iran's attempts to disrupt freedom of navigation through the Strait of Hormuz and hold the global economy hostage," he said.

The White House and Iran's Embassy in Bangkok did not immediately reply to a request for comment.

Iran has sought to tighten its grip on the Strait of Hormuz since US and Israeli strikes on February 28, using the chokepoint to pressure Washington, which has been pressing its own naval blockade of Iranian ports.

Before the war, the waterway handled roughly a third of globally traded urea — the world's most widely used fertilizer — and nearly half of seaborne sulphur, a key input. It is also a major conduit for global oil supplies.

Fertilizer shipments out of the Gulf region remained largely halted more than six months after the start of the conflict, the Washington-based International Food Policy Research Institute said in a note last month. Fertilizer products accounted for a "very negligible" share of the resumption of some shipping during a ceasefire between mid-June and mid-July, it said.

If the Hormuz disruption continues, commodity prices could rise by up to 81percent for cereals, 66 percent for oil crops and 30 percent for animal products, according to an August report by the International Chamber of Commerce.

"If we miss that planting season, the productivity of agriculture would significantly drop and the impact on prices will significantly increase," said Moreira da Silva, who is also the executive director of the United Nations Office for Project Services.

The proposed operation would use a coordination center in Oman to register vessels and coordinate safe passage, with UN monitors working alongside local authorities at Gulf ports to verify cargo loading.

The passage of only five vessels per day through Hormuz could keep fertilizer supplies flowing to countries in critical need, Moreira da Silva said.

Ships would be tracked during transit, and additional inspections could be carried out if countries raised concerns about a vessel or its cargo, he added.

Iran and the United States have exchanged proposals through intermediaries since a June interim ceasefire collapsed, but efforts to reopen the Strait of Hormuz have stalled over Tehran's conditions and Washington's insistence on addressing Iran's nuclear program from the outset.

The proposed UN mechanism could operate alongside negotiations on a comprehensive deal aimed at securing lasting peace and freedom of navigation, Moreira da Silva said.

"What we are telling them is, while you continue your discussions towards a comprehensive deal, let us work, let us do our job," he said, declining to specify the exact bottlenecks to a deal as discussions continue with both sides.

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