Jessica Crettenden (SARDI) and Roy Latta (Dodgshun Medlin)
|Contributor||SARDI Minnipa Agricultural Centre|
Site 22, Minnipa Agricultural Centre, SA
To test whether soil fertility and health could be improved under a higher input system (e.g. higher fertiliser and seeding rates, establishment of improved pasture) compared to a lower input and more traditional system (district practice seed and fertiliser inputs, volunteer pasture).
The six year (2008-2013) rotation of: wheat, wheat, pasture (volunteer and sown annual medic), wheat, pasture (annual medic – self regenerating) and wheat, was also split into grazed and un-grazed treatments in both the high and low input systems to establish the relative impact of grazing.
|Lead research organisation||
Southern Farming Systems
|Host research organisation||
SARDI Minnipa Agricultural Centre
|Trial funding source||GRDC SFS00028|
Grain & Graze 3
We gratefully acknowledge the help of Mark Klante and Brett McEvoy for site management and Ian Richter and Wade Shepperd for data collection.
|Other trial partners||EP, BCG, MSF, Ag Excellence Alliance|
|Sow rate or Target density||50kg/ha|
|Sow date||5 May 2013|
|Harvest date||4 November 2013|
|Plot size||350m x 100m|
7 kg N/ha and 8 kg P/ha (45 kg/ha DAP) and 70 kg/ha with 13 kg N/ha and 15 kg P/ha (75 kg/ha DAP) for the traditional (low) and high input treatments respectively.
Weed control was imposed on all treatments as required in both summer and during the growing season.
||Soil N (mg/kg)||Dry matter (t/ha)||Organic carbon (%)||Screenings (%)||Grain yield (t/ha)||Colwell phosphorus (mg/kg)||Water use efficiency (kg/ha/mm)||Establishment plants (plants/m2)||Protein (%)|
|1||█ Wheat:Mace||█ Low input - grazed||111||5.3||1.3||5.6||1.9||34||15||127||10.3|
|2||█ Wheat:Mace||█ Low input - un-grazed||84||5.4||1.2||4.7||1.8||27||14||124||10.3|
|3||█ Wheat:Mace||█ High input - grazed||118||6.3||1.2||6.3||2.1||18||16||175||11.2|
|4||█ Wheat:Mace||█ High input - un-grazed||74||6.1||1.1||5.6||2.1||22||16||158||10.8|
|Rainfall trial gsr (mm)||237mm|
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.