To investigate the effects of seeding rates (plant density) on grain yield and quality in four barley varieties at three locations (Berriwillock, Birchip and Rupanyup).

• Unlike wheat, higher seeding rates in malt barley may have a detrimental impact on grain yield and quality. This is particularly the case for Schooner (lower yields) and Vic Sloop (higher screenings).
• The exception to this rule may be Gairdner. Higher plant densities had no impact on yield or grain quality so increasing seeding rates in this variety may be a management tool available to compensate for its poor early vigour.