May 5 (Reuters) - Australia's QBE Insurance Group on Thursday said its first-quarter written premiums grew 22% in constant currency terms, as volatility because of the Russia-Ukraine war led to more demand to insure grains and other crops.

The company said quarterly gross written premiums rose to $6.9 billion, and forecast a net impact of around $75 million from its exposure to the broader Russia-Ukraine conflict. ($1 = 1.3793 Australian dollars) (Reporting by Savyata Mishra in Bengaluru; Editing by Christian Schmollinger)