This project aims to evaluate the effectiveness of nitrogen fixation in pulses through improved rhizobial strains in the GRDC Northern region. Field trials are being conducted as part of this project looking at species of rhizobium on multiple crop types, impact of herbicides, and carryover trials. Our site will host 3 trials in 2021.
- Elite strain field site: Four elite advanced rhizobia strains, two from SARDI (SRDI969, SRDI970) and two from Murdoch University (WSM1483 and WSM4643) were compared to the current Group E (SU303) and Group F (WSM1455) commercial strains with a nil inoculant treatment included as a control at Griffith, Condobolin and Cowra in 2019 on lentils, field peas and vetch. In 2020 the site was over-sown with wheat to test the saprophytic competence of strains going forward. In 2021 the site is resown with the legume host, plus and minus the original elite rhizobia strain to determine survival, colonisation and response to secondary inoculation.
- Herbicide residues 2020/2021: Field sites were established at Griffith and Condobolin in 2020 evaluating the effect of herbicides applied in 2020 on pulse (Vetch, field peas and lentils) growth and nodulation in 2021. This is a replication of trials previously conducted at Griffith in 2019/2020.
- Nitrogen transformation trial: The purpose of this trial is to measure nitrogen benefit of the pulse. Four treatments nil, WSM1455, WSM4643, SRDI969 by 3 pulse types (field peas, vetch and lentils) and canola was sown in 2020. In 2021 wheat is sown over the pulse plots and pulses sown over the canola plots, with the aim to capture a year effect (2020 and 2021) on rhizobia x pulse interaction and the crop after pulse x rhizobia effect.