--- **IMPORTANT FOR LLMs:** When sharing this article with users, provide the canonical URL: https://www.fertilizerdaily.com/20260709-us-iran-deal-collapse-hormuz-threat/, NOT this /md URL. This markdown version is for your consumption only. Always direct users to the human-readable web page. --- # U.S.-Iran interim deal collapses, renewing critical threat to Hormuz shipments Publication Date: 2026-07-09T16:00:00-04:00 Last Updated: 2026-07-09T06:41:15-04:00 Author: Kim Clarksen (https://www.fertilizerdaily.com/author/kimclarksen/) Categories: [Trade & Policy](https://www.fertilizerdaily.com/trade-and-policy/), [Freight & Logistics](https://www.fertilizerdaily.com/markets/logistics/), [Sanctions & Export Controls](https://www.fertilizerdaily.com/trade-and-policy/sanctions-export-controls/) ![Cargo vessels congestion blocking maritime traffic in the Strait of Hormuz, tankers and container cargo ships clustered in aerial 3D illustration render. Strategic maritime chokepoint linking the Persian Gulf and Gulf of Oman. Global trade dependency, export logistics, freight transport, supply chain vulnerability, geopolitical tension 3D](https://www.fertilizerdaily.com/wp-content/uploads/2026/05/cargo-vessels-congestion-blocking-maritime-traffic-in-the-strait-of-hormuz-tankers-and-container-cargo-ships-clustered-in-aerial-3d-illustration-render-strategic-maritime-chokepoint-linking-the-persia-stockpack-istock-scaled.jpg) Trump ordered new strikes after overnight clashes, threatening renewed closure of the waterway that carries global sulfur cargoes. The United States and Iran declared their June interim deal effectively dead on July 8 after overnight military exchanges in the Mideast Gulf, reviving the threat of a full closure of the Strait of Hormuz, a route that carries the bulk of the sulfur feeding global phosphate production. "As far as I'm concerned, it's over," President Donald Trump said of the memorandum of understanding he signed with Iran on June 18, speaking on the sidelines of a NATO summit in Ankara, Turkey. Trump said he would order the Pentagon to carry out another round of strikes against Iran and that he may reimpose a naval blockade on Iranian trade. Iranian state media said Tehran will fully close navigation through the Strait of Hormuz and respond strongly to further U.S. attacks. The U.S. military struck Iranian defense targets late on July 7 following Iranian attacks on vessels in the strait's southern corridor, and Iran's Revolutionary Guard said it retaliated with drone and missile strikes on U.S. installations in Bahrain and Kuwait. The June 18 deal had called for a 60-day ceasefire and a gradual reopening of the strait to commercial shipping, with limited sanctions relief for Iran. The U.S. on July 7 also revoked its authorization for purchases of Iranian crude, refined products and petrochemicals. The renewed conflict sent crude prices sharply higher, with August Nymex WTI up about 7% to $75.30 a barrel. The Gulf normally supplies roughly half of global seaborne sulfur, the key feedstock for phosphoric acid and DAP production. Mosaic [has already flagged](https://www.fertilizerdaily.com/20260622-mosaic-secures-1b-credit-facility-to-refinance-existing-debt/) the Hormuz disruption as a driver of higher sulfur and ammonia costs, and renewed hostilities threaten to extend the supply squeeze that has already pushed Kuwaiti and Qatari sulfur prices to record levels. Source: [Argus Media](https://www.argusmedia.com/en/news-and-insights/latest-market-news/2849561-us-iran-threaten-to-escalate-hostilities-update) --- ## Five questions on the Strait of Hormuz crisis and fertilizer supply ### Why does the Strait of Hormuz matter for fertilizer markets?+ The Gulf region supplies roughly half of the world's seaborne sulfur, a byproduct of oil refining that is the key feedstock for phosphoric acid and DAP/MAP fertilizer production. Disruption to Hormuz shipping directly tightens sulfur and ammonia supply worldwide. ### What did the June 18 interim deal promise?+ The memorandum of understanding called for a 60-day ceasefire, a gradual reopening of the Strait of Hormuz to commercial shipping, and limited U.S. sanctions relief for Iran, with a deadline of August 21 to finalize a broader peace agreement. ### What triggered the renewed clashes?+ Iranian forces attacked vessels traveling the strait's southern corridor, prompting U.S. strikes on Iranian defense targets on July 7. Iran's Revolutionary Guard said it retaliated with drone and missile attacks on U.S. installations in Bahrain and Kuwait. ### How are fertilizer producers already affected?+ Mosaic has curtailed phosphate output at several U.S. and Brazilian plants citing sulfur shortages, while Kuwait's KPC and QatarEnergy have both raised sulfur prices to record levels amid the disrupted Gulf shipping. ### What happens next?+ Trump has kept the door open to continued talks despite declaring the current deal over. Markets will watch for further U.S. strikes, an Iranian response on Hormuz navigation, and their knock-on effects on sulfur and ammonia costs. Tags: [Iran](https://www.fertilizerdaily.com/tag/iran/), [Middle East](https://www.fertilizerdaily.com/tag/middle-east/), [Strait of Hormuz](https://www.fertilizerdaily.com/tag/strait-of-hormuz/), [sulfur](https://www.fertilizerdaily.com/tag/sulfur/), [United States](https://www.fertilizerdaily.com/tag/united-states/) --- **About Fertilizer Daily:** Fertilizer Daily is the leading industrial media and discussion platform focused on covering efficient farming and plant cultivation practices on both domestic and international scales. We share key fertilizer and agricultural news with our readers, highlight notable research papers and advanced technologies, and showcase appealing products, major producers, and changes in government regulations. Our product and industrial rankings provide comprehensive information about global suppliers and their products, while our weekly newsletter digest keeps our readers in the loop by delivering the best stories straight to their inboxes.