SARDI: Brian Dzoma
Cereal crops are not yielding as high as expected after medic.
The effect of herbicides on germination, nodulation, dry matter production and nitrogen fixation are being studied.
The project is looking at whether post-emergent herbicides are having an effect on nodulation and nitrogen fixation, and if herbicide use in the previous crop could be having an effect on germination, nodulation, dry matter production and nitrogen fixation.
In the field
There are two trial sites in the three-year project aiming to Identify the causes of unreliable nitrogen fixation by medic based pastures. One trial is on a sandy loam soil in a ‘typical Mallee’ environment with average to good nutrition at Pinbong, about 10 kilometres north-west of Wudinna and the other is on a grey calcareous sand at Piednippie, inland from Streaky Bay. Early results indicate soil nutrition can play a role in the amount of nitrogen fixed.