A four-year study has investigated if lime applied in a low pH soil could enhance the efficacy of herbicides on wild radish and improve crop performance in a wheat-wheat-lupin-barley rotation at the Wongan Hills Research Station, Western Australia (WA).

Three years after application of lime, soil pH increased by about 1 unit at the top soil and 0.08-0.26 units at the sub-soil layers. • The effect of liming improved crop vigour in 2013 by up to 16% and this effect reduced wild radish density by 50%. This reduction was however not significant, most likely due to low radish densities and a high level of variability. • Velocity together with simazine in previous seasons reduced wild radish density by 98% in 2013 season and improved crop vigour by up to 16%. • Lime increased barley grain yield by up to 6% and Velocity by up to 8%. • Lime effect on herbicide efficacy to control radish in barley crop was not evident.