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Great Southern Development Commission
No full textGreat Southern Development Commission boundaryhttps://library.dpird.wa.gov.au/gis_maps/1045/thumbnail.jp
Weed Seed Wizard scenario - herbicide resistance in wild radish in Moora, Western Australia
No full textThe Weed Seed Wizard is a national collaborative project that uses paddock management information to predict weed emergence and crop losses now and in the future.
The Weed Seed Wizard is a computer simulation tool that: applies to all Australian grain growing areas helps growers understand and manage weed seedbanks on their farms uses farm management records to simulate how different crop rotations, weed control techniques, irrigation, grazing and harvest management tactics can affect weed numbers, the weed seedbank and yields uses farm-specific management and site-specific weather is multi-species
See www.dpird.wa.gov.au for further information on Weed Seed Wizard.
This Western Australian scenario is set in Moora between 2004 and 2008 and is a barley - wheat - lupin - wheat rotation with wild radish and annual ryegrass
Weed Seed Wizard scenario - glyphosate resistance in barnyard grass in Goondiwindi, Queensland
No full textThe Weed Seed Wizard is a national collaborative project that uses paddock management information to predict weed emergence and crop losses now and in the future.
The Weed Seed Wizard is a computer simulation tool that: applies to all Australian grain growing areas helps growers understand and manage weed seedbanks on their farms uses farm management records to simulate how different crop rotations, weed control techniques, irrigation, grazing and harvest management tactics can affect weed numbers, the weed seedbank and yields uses farm-specific management and site-specific weather is multi-species
See www.dpird.wa.gov.au for further information on Weed Seed Wizard.
This Queensland scenario is set in Goondiwindi between 2005 and 2008 and is a wheat - barley - sorghum - chickpea rotation with a long fallow between barley and sorghum. The main weed is barnyard grass
Incorporation of undissolved lime from previous applications can ameliorate subsoil acidity promptly and improve crop performance on sandy soils of the semi-arid regions of Western Australia
No full textBackground and aims
Repeated surface application of lime for managing subsoil acidity is slow and ineffective, resulting in an accumulation of undissolved lime (carbonate) in the topsoil. We investigated the impact of the incorporation of undissolved lime into the subsoil to improve acidity and crop performance. Methods
The undissolved lime in 2-cm layers of topsoil (0–10 cm) from three long-term experiments in Western Australia was measured. Both limed and unlimed topsoil with the acidic subsoil of the same profile was incubated at eight incorporation rates for six weeks, followed by growing barley and wheat in the incubated soil for two weeks to assess the impact on soil acidity and crop root architecture, respectively. Furthermore, a three-year-long field experiment was conducted following strategic tillage in limed and control plots to assess the impact on soil acidity and performance of wheat, canola and barley. Results
A significant amount of undissolved lime was concentrated in the topsoil, amounting to 1.7, 1.8 and 1.3 t/ha for the limed plots at Wongan Hills, Northam and Merredin, respectively. Incubation of 5–25% topsoil after incorporation with the acidic subsoil was enough to ameliorate subsoil acidity and to improve root length density by up to 13-fold depending on undissolved lime content in topsoils and soil type. In the field experiment, the incorporation of undissolved lime also significantly improved subsoil acidity and canola performance. Conclusion
We concluded that the incorporation of topsoil containing sufficient undissolved lime with acidic subsoil may offer a quick amelioration of subsoil acidity
Understanding the impact of strategic deep-tillage practices on weed dynamics and pre-emergent herbicide efficacy
No full textStrategic deep-tillage (SDT) practices, including soil inversion (mouldboard ploughing), soil loosening (deep ripping), or soil mixing (rotary spading), disturb soil to a greater extent than crop sowing, addressing soil constraints (e.g., soil acidity, water repellence, or soil compaction). While not primarily intended for weed control, these practices influence weed demography and pre-emergent herbicide effectiveness. This research investigated SDT practices’ impact on weed dynamics and pre-emergent herbicide effectiveness in the first year post-amelioration under varied soil moisture and rainfall conditions
Procedures for rangeland condition assessment in the Pilbara and southern rangelands 2022
No full textTo define the procedures used in 2022 by DPIRD to complete rangeland condition assessment (RCA) in the Pilbara and southern rangelands region which has predominantly shrub-based pastures. For the rest of the pastoral estate, DPIRD uses the Procedures for RCA in the Kimberley which has grass pastures.
RCA is the process DPIRD uses to make systematic, lease level assessment of rangeland. Rangeland condition considers both the condition of pastures (as defined in the Pasture condition and management guide for the Pilbara rangelands or Southern rangelands pasture condition and management guides) and soils (as determined by erosion, using the erosion assessment method) on pastoral lands in Western Australia (WA). The methods have evolved over several decades of practice and are unique to WA.
RCAs generally report on the basis of pastoral stations, which may contain one or more pastoral leases and, on occasion, include land with other tenure types that is used for pastoral purposes.
The data collected during an RCA are used to report on rangeland condition at the lease and regional scales. The RCA aims to quantify the condition of rangeland landscapes and pastures and to use this and other information to assess the effectiveness of pastoral management. The RCA process is part of DPIRD\u27s regulatory compliance approach
Ord River Irrigation Area Stage 2 M2 Supply Channel Compliance Assessment Report 2023 - Statement 938
No full textMinisterial implementation Statement 938 for the Ord River Irrigation Area Stage 2 (M2 Supply Channel) proposal was published on 12 June 2013 pursuant to section 45 of the EP Act. DPIRD administers MS938 on behalf of the Minister for Regional Development
BEN Signage Installation Map – Shire of East Pilbara
No full textBeach Emergency Number (BEN) Signage Installation Map – Shire of East Pilbarahttps://library.dpird.wa.gov.au/gis_bens/1054/thumbnail.jp
Soil amendment and tillage to reduce phosphorus loss in coastal Western Australia
No full textPhosphorus (P) runoff is a major factor contributing to water quality decline in waterways and waterbodies of coastal Western Australia (WA). Soils with naturally low P retention or those with increased P saturation from P application have higher risk of P loss via leaching or runoff. Substantial research has been carried out to minimise P loss via leaching and runoff through modifications of soil P retention capacity. We review literature of P retentive soil amendments, natural clays and tillage of soil to lift clay to the surface to increase P retention and reduce P loss from poorly retentive sandy soils and P stratified soils, and which have been tested for efficacy and safety. This review includes published research, previously unpublished trial data, research in unpublished reports and published research in limited circulation with particular emphasis on the Swan Coastal Plain due to unabated P loss and limited uptake of soil amendment in the region to combat it. Key findings are that amending leaching sands with bauxite residue from alumina refining, neutralised used acid (NUA from mineral sands processing) and clay, as well as tillage or mixing of P stratified soils have been shown to be very effective at reducing P loss. Increases in plant productivity have been found, depending on conditions such as soil pH and soil test P. For the materials tested, soil amendment did not lead to undue uptake of trace elements or concerning levels of radiation. Trials of NUA have shown Mn is close to acceptable limits or slightly exceeds them and is the subject of further research to determine application rates and field conditions required to minimise Mn or other contamination. The P retentive effect of soil tillage is restricted to soils with high P levels in the soil surface and higher P retention below the surface, reachable by soil tillage equipment
Agricultural groundcover update April 2024
No full textIn April, over 12% (1,876,000 ha) of the arable farmland in the south-west of Western Australia had less than 50% vegetative groundcover, which is inadequate to prevent wind erosion. Northern grainbelt had the highest risk of wind erosion and over 26% of this farmland had inadequate groundcover, predominantly found on landscapes known for sandy soils. About 1.5% (238,900 ha) of arable land had a high to very high risk of wind erosion because groundcover was less than 30%