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 Cereal: Wheat
Treatment type(s)
  • Grazing: Timing
  • Herbicide: Type
  • Stubble: Management
Trial type Experimental
Trial design Replicated
Sow rate or Target density 60kg/ha
Sowing machinery Not specified
Sow date 20 May 2015
Harvest date 12 November 2015
Plot size 18m x 2m
Plot replication 3
Plot blocking Not specified
Plot randomisation Not specified
Paddock history 2015: Mace wheat, 2014: Regen medic pasture, 2013: medic pasture
Fertiliser

60kg/ha DAP

Herbicide Not specified
Insecticide Not specified
Fungicide Not specified
Pesticide Not specified
Soil amelioration Not specified
Seed treatment Not specified
Inoculant Not specified
Tillage In 2015 pre-sowing treatments imposed were: (i) harrowing to remove medic stubble, (ii) disc/light t
Other trial notes Not specified
Download the trial report to view additional method/treatment information

Trial results Table 1

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

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
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BOM Data source MINNIPA PIRSA [4269] 2km proximity to trial site location


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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.