Basic materials sales, which includes primary goods such as agriculture products, led the decline, falling a seasonally adjusted 3.2 per cent in the quarter, its first contraction since June 2013.
The March quarter captured ongoing weakness in global dairy prices, which is seen as putting the country's biggest export sector under risk, and as drought conditions were declared in some parts of the country.
Machinery and equipment sales fell 2.6 per cent, motor vehicles and auto parts edged down 0.1 per cent, while other goods, which includes textile and apparel, pharmaceuticals, and furniture and floor covering, dropped 2.3 per cent, and commission-based wholesaling shrank 9.3 per cent.
Grocery-liquor and tobacco products wholesale trade, which accounts for almost a third of all activity, was the only sector to expand in the quarter, advancing 2.8 per cent.
Wholesale drop
•Three months ended March 31.
•0.8% fall in seasonally adjusted wholesale trade.
•2.6% fall in machinery and equipment sales.
•2.8% rise in grocery-liquor and tobacco products.