Trade press reported that from mid-March 2026 Chinese customs stopped accepting export declarations for mainstream MAP, DAP, and related phosphates through August, implementing the December industry consensus. ChemNet's item is at https://news.chemnet.com/news-3305.html. Leading producers including Yuntianhua, Xingfa, and Xinyangfeng halted outbound phosphate fertilizer shipments.
Non-fertilizer phosphorus chemicals, for example purified phosphoric acid and iron phosphate, were described as outside the fertilizer suspension. The halt is a fertilizer-export policy, not a blanket phosphorus-chemical lock. Domestic phosphate plants can still run if they have sulfur. Export MAP and DAP cannot leave.
A country that blocks phosphate exports reduces one source of global DAP and MAP and, if those plants then cut runs, reduces that country's sulfur import bid. Both happened. SunSirs later put May sulfur imports at 268,300 tonnes, down 66 percent, with MAP utilization toward 40 percent and DAP toward 30 percent. SMM put first-half sulfur imports at 2.26 million tonnes, down 57.7 percent.
The December industry consensus implemented in March is a food-security and domestic-availability policy in the same family as Russia's later sulfur-export ban framing. Phosphate that stays in China is phosphate that does not clear in India, Brazil, or Africa. Sulfur that those Chinese plants do not burn is sulfur that does not need to be imported through a closed Hormuz.
Alberta recovered sulfur still leaves mainly through the Vancouver stem. A Chinese phosphate export halt is a demand risk on that stem, not a supply gift. VFPA's 2025 China sulphur line was 1.30 million tonnes. 2026 China, on the later customs prints, did not take that weight. Indonesia and the United States took more of Canada's June list.
TFI's August interview treated Hormuz plus the Russia ban as the sulfur bottleneck for US phosphate. China's MAP and DAP halt is the other large phosphate system's policy response: keep tonnes at home, cut runs, stop importing 9.61 million tonnes of sulfur at 2025 rates. Two systems, two answers, one missing Gulf tonne.
Tampa Q3 molten at $705 per long ton (Argus, https://www.argusmedia.com/en/news-and-insights/latest-market-news/2851577-tampa-3q-liquid-sulphur-price-hits-record-705-lt) is the US contract that still cleared. Chinese export DAP that cannot clear customs is not in that contract. Global DAP tightness from a Chinese halt can still lift the value of Mosaic and OCP tonnes that do ship, if those plants can get sulfur.
OCP's later Q2 cuts of up to 50 percent on sulfur shortage show the other side: a phosphate exporter that wants to ship and cannot feed the acid plant. China is an exporter that chose not to ship. Morocco is an exporter that was forced to cut. The sulfur market felt both as less acid demand and less phosphate supply, in different geographies.
Through August is the stated window in the mid-March reporting. The desk will not assume a September reopening until customs accepts declarations again. Named producers are Yuntianhua, Xingfa, and Xinyangfeng.
Figures follow ChemNet and later SunSirs and SMM customs prints. Licensed weekly grids are not restated.