Immediate gains in yields and alleviating subsoil acidity are possible through deep banding of lime as an alternative to applying lime to the soil surface using a fertiliser spreader, according to recent research. The research conducted by the WA Department of Agriculture showed subsoil pH was raised by as much as 0.3 pH units in 2001 through deep banding, with further increases expected this year. By contrast, surface application at heavy rates would take three to seven years to achieve such pH changes. Surface application does not allow much lime to leach into the subsoil, resulting in a slow and incomplete correction of subsoil acidity. Further research is needed to examine the long-term implications of deep banding, identifying where it will be profitable and assessing other methods of delivering lime to the subsoil.
Contact: Mr Chris Gazey 08 9690 2149 or Mr Michael O'Connell 0898928511