Since then, trade tensions between the US and China have been escalating with the world's two biggest economies imposing tit-for-tat tariffs.
That included new US tariffs on steel and aluminium imports, with Chinese production of those metals attracting accusations of undercutting rivals and dumping goods in foreign markets for several years.
The ANZ report shows aluminium prices fell 5.1 per cent in March, and Wiliams said there's more uncertainty "given China's clampdown on excess production and capacity restrictions to improve air quality".
Dairy prices rose 3 per cent in March as a resumption of Chinese demand after the Lunar New Year coincided with supply concerns. Whole milk powder prices rose 4.4 per cent and butter was up 5.5 per cent, while skim milk powder dropped 3.8 per cent.
Meat and fibre prices increased 0.3 per cent as beef markets were bolstered by tight Australasian supply, while Chinese demand drove a recovery in wool prices from recent lows, rising 0.6 per cent.
Forestry prices edged up 0.3 per cent, their 18th straight gain as domestic and Chinese demand for wood products persists. Seafood and horticulture prices were largely unchanged.