Grass weed management in pasture

2015

Research organisatons
Funding source

Trial details

Researcher(s) Amanda Cook, Wade Shepperd and Ian Ricther (SARDI)
Year(s) 2015
Contributor Eyre Peninsula Agricultural Research Foundation
Trial location(s) Site 13, Minnipa Agricultural Centre, SA
Related trials
Grass weed management in pasture locations
Aims

The GRDC project ‘Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula’ aims to produce sustainable management guidelines to control pests, weeds and diseases while retaining stubble to maintain or improve soil health, and reduce exposure to wind erosion. The major outcome to be achieved is increased knowledge and skills allowing farmers and advisers to improve farm profitability while retaining stubble in farming systems on upper Eyre Peninsula (EP).

The Minnipa Agricultural Centre S3S pasture trial was established in 2013 to assess barley grass weed management with a two year medic pasture break. The trial had different grass weed management and tillage treatments imposed in 2013 and in 2014. The trial was then sown with wheat in 2015.

Key messages

Following two years of grass free medic pasture soil mineral nitrogen levels averaged 158 kg N/ha and all disease inoculum levels were low.

Cutting the medic pasture for hay lowered dry matter production and medic pod set in the following season.

An early light tickle resulted in higher weed germination and lower powdery mildew damage in spring.

Full cut tillage following two years of grass free medic resulted in the highest wheat yields while a discing prior to seeding resulted in the lowest yield.

Working medic residues in the year prior reduced the following wheat yield but grain protein was higher.

Cutting a medic pasture for hay in 2013 reduced medic productivity in 2014 and lowered wheat grain protein in 2015.

Lead research organisation Eyre Peninsula Agricultural Research Foundation
Host research organisation SARDI Minnipa Agricultural Centre
Trial funding source GRDC EPF00001
Related program Maintaining profitable farming systems with retained stubble
Acknowledgments

Trial funded by GRDC Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula (EPF00001).


Other trial partners Not specified
Download the trial report to view additional trial information

Method

Crop type
Treatment type(s)
  • Grazing: Timing
  • Herbicide: Type
  • Stubble: Management
Trial type Experimental
Trial design Replicated

Minnipa Agricultural Centre 2015

Sow rate or Target density 60kg/ha
Sow date 20 May 2015
Harvest date 12 November 2015
Plot size 18m x 2m
Plot replication 3
Fertiliser <p>60kg/ha DAP</p>
Tillage In 2015 pre-sowing treatments imposed were: (i) harrowing to remove medic stubble, (ii) disc/light t
Download the trial report to view additional method/treatment information

Trial results Table 1

# Treatment 1
Test weight (kg/hL) Yield (t/ha) Protein (%) 1000 grain weight (g) Crop Establishment (plants/m2)
1 2013 Pasture topped 2014 unworked 2015 Disc 74.3 2 14.9 24.4 114
2 2014 worked 2015 Disc 73 1.84 15.5 23.1 101
3 2013 Mowing/haycut 2014 unworked 2015 Disc 75.4 2.25 14.3 25.3 118
4 2014 worked 2015 Disc 73.7 2.07 14.9 24.2 126
5 2013 Selective grass only 2014 unworked 2015 Disc 76.1 1.77 15.6 24.6 106
6 2014 unworked 2015 Disc 74.3 1.55 16.2 23.2 116
7 2013 Pasture topped 2014 unworked 2015 Full cut 74.6 2.3 14.5 24.7 125
8 2014 worked 2015 Full cut 73.2 2.17 14.9 23.5 120
9 2013 Mowing/haycut 2014 unworked 2015 Full cut 76.2 2.33 13.8 25.9 112
10 2014 worked 2015 Full cut 73.8 2.15 14.7 23.9 112
11 2013 Selective grass only 2014 unworked 2013 Full cut 77.2 1.98 14.1 26.4 120
12 2014 worked 2015 Full cut 74 1.77 15.5 23.5 117
13 2013 Pasture topped 2014 unworked 2015 Harrowed 73.5 2.21 15 24.2 126
14 2014 worked 2015 Harrowed 72.7 2.14 15.2 23.2 136
15 2013 Mowing/haycut 2014 unworked 2015 Harrowed 75.8 2.27 14 26 119
16 2014 worked 2015 Harrowed 73.8 2.2 14.8 24.1 124
17 2013 Selective grass only 2014 unworked 2015 Harroweed 75.7 1.93 15.1 24.6 141
18 2014 worked 2015 Harrowed 74.4 1.77 15.7 24.6 132
19 2013 Pasture topped 2014 unworked 2015 Direct drilled 74.2 2.15 14.6 24.8 129
20 2014 worked 2015 Direct Drilled 73.2 1.95 15.3 23.2 140
21 2013 Mowing/haycut 2014 unworked 2015 Direct drilled 76 2.31 13.9 26.2 116
22 2014 worked 2015 Direct Drilled 73.7 2.28 14.6 24.5 132
23 2013 Selective grass only 2014 unworked 2015 Direct drilled 75.3 1.78 15.4 24.4 134
24 2014 worked 2015 Direct Drilled 73.1 1.6 16.2 22.9 130

1000 grain weight g


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Crop Establishment plants/m2


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Protein %


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Test weight kg/hL


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Yield t/ha


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Observed trial site soil information
Trial site soil testing
Site Depth Type pH EC P K N A OC CAT
Site 13, Minnipa Agricultural Centre, SA 0 - 10cm 8.00 1.44 35.00 39.00
Site 13, Minnipa Agricultural Centre, SA 10 - 30cm 8.00 1.43 5.00 47.00
Soil conditions
Trial site Soil texture
Site 13, Minnipa Agricultural Centre, SA Red loam
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 13, Minnipa Agricultural Centre, SA Calcarosol
National soil grid Source
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

Site 13, 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

Site 13, 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.