Mechanisms that lead to yield loss after grazing

2015

Research organisatons
Funding source

Trial details

Researcher(s) Jessica Crettenden
Year(s) 2015
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Minnipa Agricultural Centre, SA
Mechanisms that lead to yield loss after grazing locations
Aims
  • To determine the ability and drivers of grain yield recovery of two different wheat varieties after grazing.
  • To investigate whether N has the ability to assist in grazing recovery of yield and/or quality compensation.

Similar trials were conducted for the GRDC funded Grain & Graze 3 project in 2015 across other agro-ecological regions including Mid-North of South Australia, Wimmera Mallee region of Victoria and Southern Victoria to determine regional and seasonal differences.

Key messages
  • The trials across agro-ecological zones have highlighted differences between varieties in their ability to respond to a range of production drivers over varied environments and seasons.
  • There was no varietal difference between Mace and Trojan at Minnipa with both yielding an average of 1.7 t/ha, and the ungrazed treatment yielded 0.2 t/ha higher than the grazed. There was no difference in grazing response between cultivars.
  • Nitrogen (N) can provide assistance in plant recovery through higher yields and grain quality with in-season application of N after grazing.
Lead research organisation Southern Farming Systems
Host research organisation SARDI Minnipa Agricultural Centre
Trial funding source GRDC SFS00028
Related program Grain & Graze 3
Acknowledgments

I gratefully acknowledge the technical assistance, support and site management of Leigh Davis and Brenton Spriggs. Thanks to John Kelsh for assistance with site management also. Thanks to Alison Frischke (Birchip Cropping Group), Mick Faulkner (Agrilink Agricultural Consultants Pty Ltd) and Zoe Creelman (Southern Farming Systems) for their guidance and support through trial development and analysis. The Eyre Peninsula Grain and Graze 3 project is funded by GRDC (SFS00028).


Other trial partners BCG, Ag Excellence Alliance
Download the trial report to view additional trial information

Method

Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Fertiliser: Rate
  • Fertiliser: Timing
  • Grazing: Timing
Trial type Experimental
Trial design Replicated

Minnipa Agricultural Centre 2015

Sow date 8 May 2015
Harvest date 11 November 2015
Plot size 20m x 24m
Plot replication 3
Fertiliser

57 kg/ha DAP at sowing.

Nitrogen treatments were imposed on the trial on the 10 August in the form of urea broadcast at rates of nil (control), 10, 25, 50 and 75 kg N/ha (equaling urea rates of nil, 22, 54, 109 and 163 kg/ha respectively) on the grazed and un-grazed sections of each plot, which was washed in by 26 mm of rainfall two days later.

Herbicide

Pre-emergent herbicide mix of 1.5 L/ha Roundup + 45 ml/ha Hammer + 1.5 L/ha Triflur X + 800 g/100 L SOA + 500 ml/100 L LI700 sprayed just prior to sowing.

To control grass weeds, 500 ml/ha 2-4-D Ester 680 was applied to wheat on 6 August.

Tillage Light prickle chain on 9 May
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Minnipa Agricultural Centre, SA Red sandy loam
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Minnipa Agricultural Centre, SA Calcarosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Minnipa Agricultural Centre SA
2015 504.4mm
2014 556.5mm
2013 476.4mm
2012 520.3mm
2011 558.1mm
2010 543.4mm
2009 534.2mm
2008 442.9mm
2007 440.4mm
2006 473.1mm
2005 447.8mm
2004 447.2mm
2003 462.9mm
2002 460.3mm
2001 504.3mm
2000 501.8mm
National soil grid Source: CSIRO/TERN
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties

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Climate

Minnipa Agricultural Centre SA 2015


Observed climate information

Rainfall avg ann (mm) 325mm
Rainfall avg gsr (mm) 241mm
Rainfall trial total (mm) 333mm
Rainfall trial gsr (mm) 258mm

Derived climate information

Minnipa Agricultural Centre SA

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Some data on this site is sourced from the Bureau of Meteorology

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.

Trial report and links

2015 trial report



Trial last modified: 08-10-2019 13:55pm AEST