Profitable crop sequences in the low rainfall region of upper Eyre Peninsula

2013

Research organisations
Funding source

Trial details

Researcher(s) Suzanne Holbery (SARDI)
Nigel Wilhelm (SARDI)
Year(s) 2013
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Minnipa Agricultural Centre, SA
Related trials
Profitable crop sequences in the low rainfall region of upper Eyre Peninsula locations
Aims

To determine the comparative performance of alternative crops and pastures as pest and disease breaks in an intensive cereal phase. 

Key messages
  • Continuously cropping cereals has increased grass weeds and root disease to a point that it is no longer the most economical option, due to decreased yield and costs associated with addressing weed and disease issues.      
  • Two year breaks starting to pay their way in the third year of the rotation. One year breaks have lifted wheat performance but have not kept grassy weeds or diseases under control.
Lead research organisation South Australian Research and Development Institute
Host research organisation SARDI Minnipa Agricultural Centre
Trial funding source GRDC DAS00119
Related program Crop Sequencing Initiative
Acknowledgments

We would like to thank Ian Richter and Wade Shepperd for their technical support.


Other trial partners Not specified
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Method

Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Crop : Type
Trial type Experimental
Trial design Replicated

Minnipa Agricultural Centre 2013

Sow rate or Target density 55kg/ha
Sow date 14 May 2013
Harvest date 29 October 2013
Plot size 1.5m x 40m
Plot replication 3
Fertiliser

65 kg/ha DAP (18:20:0:0) on 14 May. Five treatments that had not had any legume break phase (2x continuous wheat, vetch/oats mix followed by wheat, oats then canola and canola then oats) in the previous two years also received 50 kg/ha of urea at sowing to compensate for any nitrogen deficiency.

Herbicide

One month post-sowing the Kord plots were sprayed with Intervix @ 0.7 L/ha. The entire trial was sprayed for broadleaf weeds with MCPA+ diflufenican @ 0.75 L/ha on 4 July and any treatment that had had a medic break phase received an additional herbicide application the following day of clopyralid 0.08 L/ha to target volunteer medic. Seven treatments (Angel medic/wheat, oats/canola, oats/peas, Jaguar medic/wheat, canola/peas, peas/wheat and peas+canola/wheat) with high levels of grassy weeds were subsequently sprayed with grass selective cloqintocet-mexyl + pyroxsulam @ 0.5 L/ha. Grassy weeds were measured in three ways to gain a greater understanding of what was occurring within rotations. Prior to sowing soil was collected from the west end of each plot to assess weed seed banks. They were grown out in a shade house where emerged plants were counted and recorded. The counting process was repeated following three times of emergence 22 May, 30 May and 3 July. The second assessment was undertaken in the field plots on 20 August when grass species were counted and recorded for each plot, and thirdly on 25 September panicle counts of grass weeds were completed as a measure of potential seed bank for the 2014 season.

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Download results

Trial results Table 1

# Variety
Treatment 1
Grain yield (t/ha) Weeds (plants/m2)
1 █ Wheat:Mace █ Chem FALLOW/V.Pasture Graze 2.87 2.6
2 █ Wheat:Mace █ CANOLA Grain/OATS Graze 2.735 6.8
3 █ Wheat:Mace █ CANOLA Grain/EARLY SOWN MEDIC Graze 2.564 3.7
4 █ Wheat:Mace █ FIELD PEA Grain/OATS Graze 2.531 4.3
5 █ Wheat:Mace █ EARLY SOWN MEDIC Hay/OATS Graze 2.455 3.8
6 █ Wheat:Mace █ MEDIC Hay/REG MEDIC+CANOLA Graze 2.409 4.1
7 █ Wheat:Mace █ OATS Hay/FIELD PEA Grain 2.407 21.8
8 █ Wheat:Mace █ CANOLA Grain/FIELD PEA Grain 2.382 6.7
9 █ Wheat:Mace █ OATS Hay/EARLY SOWN MEDIC Graze 2.374 18.8
10 █ Wheat:Mace █ FIELD PEA Grain/CANOLA Grain 2.321 9.2
11 █ Wheat:Mace █ FIELD PEA+CANOLA Hay/WHEAT Grain 2.23 19.2
12 █ Wheat:Mace █ SULLA/SULLA Graze 2.229 5.6
13 █ Wheat:Mace █ EARLY SOWN MEDIC Hay/CANOLA Grain 2.213 7.2
14 █ Wheat:Mace █ FIELD PEA Grain/WHEAT Grain 2.195 35.6
15 █ Wheat:Mace █ JAG MEDIC Seed/WHEAT Grain 2.134 25.5
16 █ Wheat:Mace █ ANG MEDIC Seed/WHEAT Grain 2.1 31.2
17 █ Wheat:Mace █ OATS Hay/CANOLA Grain 2.098 34.1
18 █ Wheat:KordCLPlus █ VETCH+OATS Hay/WHEAT Grain 1.818 8.8
19 █ Wheat:KordCLPlus █ CONTROL WHEAT B Grain 1.692 39.2
20 █ Wheat:KordCLPlus █ CONTROL WHEAT A Grain 1.631 41.9

Grain yield t/ha


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Weeds plants/m2


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Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Minnipa Agricultural Centre, SA Red sandy clay 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
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Climate

Minnipa Agricultural Centre SA 2013


Observed climate information

Rainfall trial gsr (mm) 237mm

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

2013 trial report



Trial last modified: 08-10-2019 15:20pm AEST