How Trump's tariffs and the Iran conflict are reshaping global agricultural trade flows — impacts on the Oceania region

Structural Forces Reshaping Global Agricultural Prices

Between 2025 and 2026, the global agricultural market experienced its most complex macro environment in recent decades. Two structural forces exerted simultaneous pressure: first, the tariffs imposed by the Trump administration on Chinese goods and China's retaliatory tariffs significantly reduced demand for US corn, soybeans, and wheat; second, military conflict between the US and Iran led to a temporary disruption in the Strait of Hormuz, causing severe energy price volatility that transmitted to agricultural prices through ethanol margins, freight costs, and fertilizer prices. According to Fastmarkets data, these factors jointly drove notable changes in key agricultural product prices at US Gulf export points: corn FOB prices rose by 9.2%, soybean oil remained high supported by biodiesel policy, while tallow and distillers corn oil (DCO) experienced short-term fluctuations due to supply rigidity.

Regional Impact Analysis

Impact on Oceania Exports

Although the direct shock centered on US-origin products, the adjustment of global trade flows inevitably affected Oceania. China imposed an effective 23% tariff on US soybeans while granting only a 3% rate to Brazil and Argentina, leading to a sustained shift in Chinese purchases toward South America. This structural shift created potential market space for Australian canola, New Zealand dairy products, and palm oil products from Pacific island nations. However, ample South American supply and pressure on global soybean prices also subjected Oceania's oilseed exports to more intense price competition.

For corn, US exports diverted to destinations such as Mexico and South Korea but failed to fully compensate for the loss of China's market share. This led to a more fragmented global corn trade flow. For Australian feed imports, more grain sources became available, but freight costs rose due to the Middle East conflict, keeping livestock production cost pressures unabated.

Energy and Freight Transmission

The Iran conflict pushed up crude oil prices, directly increasing maritime freight rates on transpacific routes. For Oceania's exports reliant on sea transport—Australian beef, New Zealand lamb, and Pacific island fishery products—the share of transport costs in final product prices rose, undermining price competitiveness. Meanwhile, fertilizer prices (particularly nitrogen fertilizers) increased with natural gas costs, raising input costs for agricultural production in Oceania.

Spillover Effects of Biofuel Policy

The US, by restricting imports, expanding the Renewable Volume Obligation (RVO) and the 45Z Clean Fuel Tax Credit, tied the prices of soybean oil, tallow, and DCO to domestic energy policy. Fastmarkets data show that US soybean oil prices have decoupled from international benchmarks, moving independently. This presents both challenges and opportunities for Oceania's biodiesel industry: on one hand, the high premium in the US market attracts regional exports of animal fats and vegetable oils; on the other hand, it may lead to a shortage of oilseeds and oils in other parts of the world, pushing up edible oil prices for Oceania consumers.

Long-term Trends and OutlookLooking ahead to the next 3 to 10 years, the global agricultural trade landscape will continue to adjust. The five-year agricultural plan released by China's Ministry of Agriculture in April 2026 explicitly states that by 2035, soybean imports will be reduced by 21.5% compared to the average level of 2023-25. This structural decline in demand will force all supplying countries (including Oceania) to seek new markets or adjust their planting structures. The possibility of the US restoring trade relations with China depends on the evolution of tariff policies, but it is difficult to reverse in the short term.

For Oceania, the deepening of regional trade agreements—such as the RCEP and the Pacific Agreement on Closer Economic Relations Plus (PACER Plus)—can provide hedging tools. Australia and New Zealand should accelerate their expansion into Southeast Asia, the Middle East, and Africa, while leveraging their image as high-quality, low-carbon agricultural producers to gain premiums in high-end markets. Pacific island countries, on the other hand, need to enhance climate-resilient infrastructure and logistics efficiency to reduce trade costs.