Physical Sciences and Mathematics Commons^™

Topsoil Evaporation In Water Repellent Soil Affected By Tillage And Claying: Preliminary Case-Study Results, Giacomo Betti, Gaus Azam

The State of Soil Science in WA

Soil water repellence represents one of the major soil constraints to broad-acre agriculture in southern Australia. Topsoil wettability is significantly reduced by the presence of hydrophobic organic compounds, resulting in poor seed germination, early plant establishment and ultimately lower yields. Soil mechanical disturbance (tillage) in combination or not with the addition of clay-rich subsoil (e.g. clay spreading) have been successfully adopted in the Australian broad-acre agriculture for the amelioration of water repellent sandy soils.

Topsoil Water Repellence Increased Early Wheat Growth And Nutrition, Simon Yeap, Richard Bell, Craig Scanlan, Richard Harper

The State of Soil Science in WA

Soil water repellence, derived from the accumulation of hydrophobic organic compounds, is a constraint to crop and pasture production worldwide predominantly in sandy soils. Inhibited water infiltration, unstable wetting, and preferential flow are key hydrologic issues in water-repellent soil which adversely affect plant germination and establishment. However, despite the general understanding that soil water repellence can reduce soil nutrient bioavailability due to the prevalence of dry topsoil, the implications of water-repellent topsoil for plant growth and nutrition per se are unclear.

Assessing The Suitability Of Black Soldier Fly Castings Produced From Piggery Waste As A Fertilizer, Luke Wheat, Lynette Abbott, Ian Waite, Sasha Jenkins

The State of Soil Science in WA

Black Soldier Fly (Hermetia illucens, BSF) farming provides an alternative waste management solution on piggeries by utilising manure to produce a high protein insect meal, whilst the fly castings (frass) are a valuable fertiliser.

Continental-Scale Soil Organic Carbon Composition And Vulnerability Regulated By Regional Soil And Environmental Controls, Raphael A. Viscarra Rossel, Juhwan Lee, T Brehrens, Z Lou, J Baldock, A. Richards

The State of Soil Science in WA

Processes that control soil organic carbon (C) composition and dynamics over large scales are not well understood. Thus, our understanding of C cycling is incomplete, making it difficult to predict C gains and losses due to changes in climate, land use and management. In this paper, we show that controls on the composition of organic C, the particulate, humus (or mineral associated) and resistant fractions, and the potential vulnerability of C to decomposition across Australia are distinct, scale-dependent and variable.

Chemical Nature Of Phosphorus In Cropping Soils From Western Australia Characterised By 31p Nuclear Magnetic Resonance Spectroscopy, Gustavo Boitt, Craig Scanlan, Zed Rengel

The State of Soil Science in WA

Speciation of soil phosphorus (P) is paramount to understanding the biogeochemical cycle in agroecosystems and key for an efficient P management. Most studies using solution-state 31P nuclear magnetic resonance (NMR) spectroscopy for P speciation were done in soils from eastern Australia. Currently, in-depth knowledge of the P dynamics is limited for the western-Australian region. Only one study has been published using solution-state 31P NMR to characterise P compounds in topsoils (0–2.5 cm) from Western Australia under karri (Eucalyptus diversicolor F. Muell.) forests. Therefore, the objective of this research is to improve our knowledge and provide new information on the …

Crop Response To Amelioration Of Agricultural Soils Are Mediated By Constraint Combinations And Soil Type, Stephen Davies, Wayne Parker, Giacomo Betti, David Hall, Tom Edwards, Chad Reynolds, Glenn Macdonald

The State of Soil Science in WA

Over the past decade alternative strategic deep tillage approaches have been developed to complement more established soil amelioration methods. Strategic tillage takes the form of a one-off or occasional intervention, implemented to overcome a number of soil and biotic constraints.

Designing Soil Covers For Ecological Restoration Of Mine Waste, Lucy Commander, Luis Merino-Martin, Peter Golos, Carole Elliott, Jason Stevens, Ben Miller

The State of Soil Science in WA

Iron-ore mining is a major industry in Western Australia. The process of iron-ore extraction results in waste rock which may be backfilled into the pit void or discarded to form ‘waste rock dumps’ and fines, a by-product of crushing iron-ore. Resource companies have a legal and social responsibility to restore waste-rock dumps using local species. However, waste material may not be ideal for plant growth. Hence, as well as gaining an understanding of soil chemical and physical properties of waste materials, it is important to understand the plants interactions with the soil, especially in the early stages of restoration, such …

Efficacy Of A Phosphate Bio-Mineral Fertilizer Varied With P Concentration And P Solubility, Salmabi Assainar, Lynette Abbott, Paul Storer, Kadambot Siddique, Zakaria Solaiman

The State of Soil Science in WA

Bio-mineral fertilizers are gaining increasing attention in cropping systems. Phosphorus (P) use efficiency for wheat (Triticum aestivum L.) from bio-mineral fertilizers is not well studied. We investigated the efficiency of a bio-mineral fertilizer (rock mineral fertilizer inoculated with a multispecies microbial inoculant and augmented with different phosphorus sources of varying concentration) under both glasshouse and field conditions.

Engineering In Situ Soil And Plant Microbiomes To Improve Agricultural Productivity, Falko Mathes, Fiona Mcdonald, Peter Keating

The State of Soil Science in WA

The world’s population is predicted to reach 9 billion people by 2050 thus increasing crop production on current agricultural land to meet the rising demand for food is paramount. Farmers routinely manage both plant and soil nutrition to increase crop yields. However, active management of in situ soil and plant microbiomes to improve productivity is uncommon. Here, we present a patented technology aiming to reliably engineer soil and plant microbiomes to increase crop production. Bioprime is a ferment of molasses that can be applied as seed coating, or as foliar and soil spray.

Humic Acid Coated Phosphatic Fertilizers Enhance Growth, Yield And Phosphorus Uptake Of Maize Crop In Alkaline Soil, Muhammed Shafi, Muhammed Sharif, Dost Muhammed, Ahmed Khan, Farmanullah Khan, Mehran Ali, Zakaria Solaiman

The State of Soil Science in WA

Phosphorus availability to crop is one of the major causes of poor crop production worldwide. Effect of inorganic phosphorus (P) fertiliser sources, i.e., nitro phosphate (NP), di-ammonium phosphate (DAP) and single superphosphate (SSP) coated with different humic acid levels on crop production and P utilization efficiency (PUE) of maize was studied.

Impact Of Lime And Gypsum On Wheat Yield, Soil And Solution Properties In The Short And Long Term, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton

The State of Soil Science in WA

No abstract provided.

Yield Response To Deep Ripping Of Canola, Wheat And Barley On Soils With Multiple Constraints, Shahab Pathan, David Hall, Tony Murfit

The State of Soil Science in WA

Yellow Tenosols (yellow deep sand) in the Western Australian grainbelt often have multiple constraints to crop production, which include non-wetting, subsoil compaction and acidity. As a result of these multiple limitations these soils have been considered poor cropping soils with estimated costs in lost production exceeding $200/ha. A systems approach to managing these soils has been developed to improve crop production, which includes a winter fallow, limesand application and deep tillage in late winter and seeding canola in the following autumn.

Impact Of Lime And Gypsum On Wheat Yield, Soil And Solution Properties In The Short And Long Term, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton

The State of Soil Science in WA

Subsoil aluminium (Al) toxicity or soils with AlCaCl2 content > 2.5 mg Al kg-1 in the soil layers below 10 cm is a significant problem in south Western Australia. Both lime and gypsum can be used to treat subsoils Al toxicity because these products decrease the toxic effect of soil Al leading to an increase in crop grain yields. In this presentation, results are reported from three field lime by gypsum rate experiments located in the east of Merredin.

Influence Of Lime And Crop Rotation On Soil Nitrogen, Dry Matter Production And Microbial Biomass; A Field Trial, Merredin, Wa, Manjula Premaratne, Daniel V. Murphy, Craig Scanlan, Frances C. Hoyle

The State of Soil Science in WA

Nitrogen (N) fertilisers are applied to the soil to meet crop N demands. A large proportion of Western Australian (WA) cropping soils are acidic, decreasing access to plant available nutrients. Application of lime is generally the most effective means of ameliorating increasing soil acidity. Meanwhile, legumes are grown rotationally with cereals to increase plant-available soil N levels. We used a field experiment at Merredin, WA (Latitude -31.483347; Longitude 118.219093) to measure the influence of historic lime application and crop rotation on soil N availability and microbial biomass carbon (MBC).

Microalgae And Phototrophic Purple Bacteria For Nutrient Recovery From Agri-Industrial Effluents; Influences On Plant Growth, Rhizosphere Bacteria, And Putative C & N Cycling Genes, Somayeh Zarezadeh, Bede S. Mickan, Sasah Jenkins, Tim Hulsen, Hossein Raihi, Navid R. Moheiman

The State of Soil Science in WA

Microalgae (MA) and purple phototrophic bacteria (PPB) have the ability to remove and recover nutrients from digestate (anaerobic digestion effluent) and pre-settled pig manure that can be utilized as a bio-fertilizer. The objective of this study was to compare the effect of biologically recovered nutrients from MA and PPB in relation to plant growth and soil biological processes involved in nitrogen & carbon cycling.

Investigation Of The Common Mycorrhizal Network Concept: Plant Growth Responses In Simulated Intercropping Of A Legume And Grass Under Water Stress, Bede S. Mickan, Miranda Hart, Zakaira Solaiman, Kadambot H.M. Siddique, Sasha Jenkins, Lynette K. Adams

The State of Soil Science in WA

It is widely claimed that the common mycorrhizal network (CMN) plays a significant role in facilitated transfer of nutrients between plants. This experiment investigated the role of a common mycorrhizal network between a C3 legume and a C4 grass under nutrient and water-limited conditions.

A Fast And Inexpensive Molecular Biological Assay To Assess Soil Health, Fiona Mcdonald, Falko Mathes, Peter Keating

The State of Soil Science in WA

Soil health and biology is capturing public imagination due to its significance in organic and regenerative agriculture and its role in mitigating climate change (a location for potential carbon sequestration). Programs centred on soil health are supported by farmers and funding bodies such as the Soil Biology Initiative (Grains Research and Development Corporation), the National Landcare Program, and the Cooperative Research Centre for High Performance Soils. Additionally, global businesses are diverting resources into understanding soil and crop microbiomes to develop novel technologies that increase soil health and crop productivity to commercialise a variety of products including soil amendments (e.g. sea …

Gouldian Finch Breeding Surveys 2021: Ord-East Kimberley Expansion Project - Weaber Plain Development Area, Nigel Jackett

Irrigated Agricultural Development in the North

The Weaber Plain Development Project (the Project) is an irrigated agricultural development located approximately 30 km north-north-east of Kununurra in Western Australia. The Project was approved by the former Department of Sustainability, Environment, Water, Population and Communities (now the Department of Agriculture, Water and the Environment) in 2011 under EPBC 2010/5491.

To satisfy Condition 6 of EPBC 2010/5491 and offset the potential impacts of the Project on the endangered Gouldian Finch (Erythrura gouldiae), a Gouldian Finch Conservation Plan was prepared. The Conservation Plan was prepared to ensure appropriate management of the Gouldian Finch and its habitat during construction and operation …

Increased Connectivity And Depth Improve The Effectiveness Of Marine Reserves, Jordan Goetze, Shaun K. Wilson, Ben Radford, Rebecca Fisher, Tim Langlois, Jacquomo Monk, Nathan A. Knott, Hamish A. Malcolm, Leanne M. Currey-Randall, Daniel Ierodiaconou, David Harasti, Neville Barrett, Russell C. Babcock, Nestor E. Bosch, Danny Brock, Joachim Claudet, David Fairclough, Stephen J. Newman, Michael J. Travers, Corey Wakefield

Fisheries Research Articles

Marine reserves are a key tool for the conservation of marine biodiversity, yet only ~2.5% of the world's oceans are protected. The integration of marine reserves into connected networks representing all habitats has been encouraged by international agreements, yet the benefits of this design has not been tested empirically. Australia has one of the largest systems of marine reserves, providing a rare opportunity to assess how connectivity influences conservation success. An Australia-wide dataset was collected using baited remote underwater video systems deployed across a depth range from 0 to 100 m to assess the effectiveness of marine reserves for protecting …

Samphires (Tecticornia Species) For Dryland Salinity Management In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Samphire is the common name for native plants from the genus Tecticornia (synonym Halosarcia). Although slower growing than saltbush and bluebush species, samphires have higher tolerance to saline conditions and waterlogging, and are common in waterlogged saline areas of south-west Western Australia.

Samphire is not a desirable grazing species.

Rhodes Grass (Chloris Gayana) For Dryland Salinity Management In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Rhodes grass (Chloris gayana) is a subtropical/summer active perennial C4 grass. It is a tufted grass that sends out strong, above ground runners (stolons), allowing it to spread rapidly. This can be a great advantage on saltland where soil salinity often inhibits recruitment from seed. However, it has low salt tolerance, and low-moderate waterlogging tolerance.

The Department of Primary Industries and Regional Development recommends that any dryland salinity management is part of a whole farm, and preferably a whole catchment, water management plan.

Pasture Legumes And Grasses For Saline Land In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

The productivity of saline and waterlogged land can be markedly increased by using salt tolerant legumes and grasses, in mixtures. The mix is particularly important for increasing the productivity and profitability of saltbush-based pastures. The information is relevant to the south-west agricultural region of Western Australia.

The Department of Primary Industries and Regional Development provides this information on the tolerance and establishment of salt tolerant legumes and grasses to improve the productivity and profitability of saline land.

Saltbushes For Dryland Salinity Management In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Saltland pastures always have a range of plant species, even in dense saltbush plantations. Saltbush will often change the watertable and surface soil characteristics enough for other plants to colonise. The understorey plants are often the most productive component of saltbush pastures.

This page provides information about each of the saltbushes that can be used in these mixed salt-tolerant pastures.

The Department of Primary Industries and Regional Development recommends that saltland management is part of a whole farm – or preferable whole catchment – plan.

Tall Wheatgrass (Thinopyrum Ponticum) For Dryland Salinity Management, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Tall wheatgrass (Thinopyrum ponticum) has been widely planted in Western Australia on saline land in the southern agricultural areas, on land that shows signs of salt and is not permanently waterlogged.

The information provided here assumes that tall wheatgrass is being grazed effectively by livestock.

Donnelly River Model Review, Justin Hughes

Natural resources commissioned reports

The Donnelly River Model was prepared for the Department of Water and Environment Regulation (DWER) by an external consultant (Hydrology and Risk Consultants) in 2018. The purpose of this model was largely to evaluate the feasibility of a proposed irrigation development centred on diversions from the Middle Donnelly near Chappel's Bridge into a reservoir in the nearby Record Brook catchment. As a part of the model build and reporting process, the HARC (2018) report was reviewed by Ecological Australia (2018) against the model specifications. ECL concluded that the model was "fit for purpose", but made many recommendations. Since re­port release, …

Industry Funding Scheme Regulations: A Review Of Operation And Effectiveness, May 2021, Department Of Primary Industries And Regional Development, Western Australia

Biosecurity published reports

Section 147 of the Biosecurity and Agriculture Management Act 2007 requires the Minister for Agriculture and Food to carry out a review of the operation and effectiveness of any regulations made for the purposes of establishing an Industry Funding Scheme (IFS) every five years.

In 2010, regulations establishing three IFSs commenced to address pest and disease threats relevant to Western Australia’s broadacre and pastoral cropping and livestock sectors. This report documents the second fifth-year anniversary statutory review of the following regulations:

• Biosecurity and Agriculture Management Industry Funding Scheme (Cattle) Regulations 2010

• Biosecurity and Agriculture Management Industry Funding Scheme …

Evaluation Of Carbon Accounting Tools Available To Mixed Farming Enterprises In Western Australia, Richard Brake

Climate Science Published Reports

In recent years consumers and the general public have become increasingly more cognisant of the environmental impact, through the emitting of greenhouse gases measured as carbon dioxide equivalent (CO2e), that the production of goods and services they consume have on the world. Global corporate businesses either through desire or market driven necessity are at the forefront of measuring and reducing their carbon footprint and in doing so placing pressure on suppliers to reduce theirs.

The impact of carbon emissions from agricultural enterprises and the role that the agricultural industry plays in the level of carbon emitted or sequestered continues to …

Short And Long Term Effects Of Lime And Gypsum Applications On Acid Soils In A Water-Limited Environment: 3. Soil Solution Chemistry, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton

Grain and Other Field Crops Research Articles

Aluminum (Al) toxicity imposes a significant limitation to crop production in South Western Australia. This paper examines the impact of surface-applied lime and gypsum on soil solution chemistry in the short term (1 year) and the long-term (10 years) in water limited environments. In the experiments, we measured soil solution chemistry using a paste extract on soil profile samples collected to a depth of 50 cm. We then used the chemical equilibrium model MINTEQ to predict the presence and relative concentrations of Al species that are toxic to root growth (Al associated with Al3+ and AlOH2 or Toxic-Al) and less …

Climate Projections For Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Climate science factsheets

Current climate model projections for Western Australia (WA) indicate that the average annual temperature will increase by 1.1–2.7°C in a medium-emission scenario, and 2.6–5.1°C in a high-emission scenario by the end of the century. Annual rainfall in the south-west is projected to decline by 6% by 2030 and 12% by 2100 (median values) for a medium-emission scenario, and by 5% and 18%, respectively (median values) for a high-emission scenario. In the northern and central parts of WA, annual rainfall remains relatively unchanged. The climate of WA varies annually, the future projection variation is not within the historical variation.

A Review Of The Economics Of Regenerative Agriculture In Western Australia, Anne Bennett

All other publications

• There is no published work detailing the economics of regenerative agriculture in Western Australia.
• Of the work completed in other jurisdictions and nations captured in this review, the profitability of regenerative agriculture compared with conventional agriculture was variable, although generally lower.
• The loss of income associated with the transition from conventional agriculture to regenerative agriculture is a significant barrier to adoption, although it is enterprise-sensitive.
• Farmers who are operating regenerative agriculture systems self-report higher levels of wellbeing.
• Conventional agriculture and regenerative agriculture are overlapping approaches.
• The literature presented in this review is mostly based on small samples, case studies or …