De-Anne Ferrier (BCG), Laura Watson and Mark Peoples (CSIRO)
|Contributor||Birchip Cropping Group|
Site 3, Birchip, VIC
To determine whether rhizobial inoculation of vetch enhances the amounts of N fixed. To evaluate the effect the timing of vetch termination has on inputs of fixed N, and on residual soil moisture and mineral N measured at the end of the 2012 growing season.
Nitrogen (N) fixation by vetch was closely related to dry matter (DM) production (26kg N fixed per tonne DM accumulated). The later the termination, the higher the calculated inputs of fixed N. Both soil water reserves and mineral N were highest at the end of the 2012 growing season following the earliest (June and July) termination timings. To establish the best time to terminate a vetch crop, weigh up the benefits being delivered by vetch (biomass accumulation and N fixation), the need to conserve moisture and time required for N to mineralise for the next crop.
|Lead research organisation||N/A|
|Host research organisation||N/A|
|Trial funding source||GRDC CSP00146|
This project was funded by GRDC, Project CSP00146: ‘Facilitating increased on-farm adoption of broadleaf species in crop sequences to improve grain production and profitability. James Hunt and Tony Swan (CSIRO) need to be acknowledged for their assistance in data interpretation and statistical analysis.
|Other trial partners||Not specified|
|Sow date||13 March 2012|
|Harvest date||Not specified|
|Plot size||Not specified|
Superfos (40kg/ha [6.16kg P/ha])
Simazine (700g/ha) + Treflan (1.5L/ha) + Roundup® (2L/ha)
||Rainfall (mm)||Shoot dry matter (t/ha)||Plant available water (mm)||Soil mineral N (kg N/ha)||Shoot N fixed (kg N/ha)|
|1||█ 8 June Termination||45||1.05||98||158||25|
|2||█ 20 July Termination||103||1.6||129||122||43|
|3||█ 19 August Termination||118||3.8||92||108||123|
|4||█ 17 September Termination||127||4.9||86||113||135|
|5||█ 13 November Termination (Control)||149||3.2||64||89||74|
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.