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Role of organic matter in soil pH change in agro-ecosystems. Over 50 million hectares of arable lands in Australia are affected by soil acidity. Acidity-affected lands continue to expand due to the ongoing process of acidification under current farming practices. The project will provide new knowledge essential for the improved use and management of organic matter to minimize or reverse soil acidification and increase carbon sequestration in farming systems. The associated reduction of soil aci ....Role of organic matter in soil pH change in agro-ecosystems. Over 50 million hectares of arable lands in Australia are affected by soil acidity. Acidity-affected lands continue to expand due to the ongoing process of acidification under current farming practices. The project will provide new knowledge essential for the improved use and management of organic matter to minimize or reverse soil acidification and increase carbon sequestration in farming systems. The associated reduction of soil acidification will also minimise the negative impact of nutrient and water losses on the environment. Growers will benefit from the project through improved soil fertility and crop production, and sustainable land use. Read moreRead less
Assessing soil formation and erosion balances in the Top End with an expanded toolkit. This work is timely as it will provide the tools and the data to assess the sustainability with regard to soil loss of potential agricultural development in the Top End of Australia. With food-growing areas in southern Australia under stress from a prolonged drought, the Federal Government has established a Northern Australia Land and Water Taskforce to explore the potential of the Top End for agricultural and ....Assessing soil formation and erosion balances in the Top End with an expanded toolkit. This work is timely as it will provide the tools and the data to assess the sustainability with regard to soil loss of potential agricultural development in the Top End of Australia. With food-growing areas in southern Australia under stress from a prolonged drought, the Federal Government has established a Northern Australia Land and Water Taskforce to explore the potential of the Top End for agricultural and other development. A key component of its brief is that development must be sustainable. The economic consequences of increased agriculture in the North are likely to be profound, and the findings of this research will be crucial to success.Read moreRead less
Reducing export of acid sulfate soil products (particularly iron, aluminium, phosphorus, and organic carbon) as contaminants to coastal waters. Current Australian management of acid sulfate soils (ASS) emphasises the reduction of acidity in floodplain drainage. However this acidity is mainly from the dissolved metals, which can be increased by some management techniques. Dissolved metals can be biotoxic or encourage harmful coastal phytoplankton. Organic metal complexes can increase metal tran ....Reducing export of acid sulfate soil products (particularly iron, aluminium, phosphorus, and organic carbon) as contaminants to coastal waters. Current Australian management of acid sulfate soils (ASS) emphasises the reduction of acidity in floodplain drainage. However this acidity is mainly from the dissolved metals, which can be increased by some management techniques. Dissolved metals can be biotoxic or encourage harmful coastal phytoplankton. Organic metal complexes can increase metal transport but shading of soil and drain surfaces, and constructed wetlands offers a new management tool. Our research aims to reduce transport to coastal waters of these ASS products. A sustainable Australian coast requires that improvement of ASS floodplains must not be at the environmental expense of coastal waters. Read moreRead less
Spatial and temporal monitoring of soil erosion risk with satellite imagery. This project is directed towards Sustainable farm practices, one of the national priorities in the Caring for Our Country program. The satellite image-based monitoring system will provide new information about the changing distribution of erosion risk in seasonal cropping systems, and identify areas where agricultural practices significantly influence this risk. The research will allow landholders, regional, state and n ....Spatial and temporal monitoring of soil erosion risk with satellite imagery. This project is directed towards Sustainable farm practices, one of the national priorities in the Caring for Our Country program. The satellite image-based monitoring system will provide new information about the changing distribution of erosion risk in seasonal cropping systems, and identify areas where agricultural practices significantly influence this risk. The research will allow landholders, regional, state and national authorities to better target effort towards sustainable land management, and improve monitoring and reporting of land condition across broad agricultural regions. Dynamic monitoring of erosion risk will also track landscape conditions and farmer responses to changing climate.Read moreRead less
How do soils grow? Modelling soil development in the landscape. This project addresses the fundamental environmental issue of land degradation in Australia. The environment is both sensitive and diverse with uses from intensive agriculture, grazing, to large scale industrial. This project will build a model that will enable us to understand how soil forms and landscape evolves with time, to reconstruct the history of soil. The model will allow us to make the Australian populous aware of the frag ....How do soils grow? Modelling soil development in the landscape. This project addresses the fundamental environmental issue of land degradation in Australia. The environment is both sensitive and diverse with uses from intensive agriculture, grazing, to large scale industrial. This project will build a model that will enable us to understand how soil forms and landscape evolves with time, to reconstruct the history of soil. The model will allow us to make the Australian populous aware of the fragility of soil formation. This will lead to greater social awareness of our precarious position on the Australian landscape.Read moreRead less
Theoretically derived calibration of the neutron moisture meter. The moisture content of soils is of key importance in a wide range of situations including agriculture, engineering and land and water management. The measurement of soil moisture contents in the field is problematic, and even commonly used methods like the neutron probe give results of limited accuracy. This research will enable calibration curves for the neutron probe to be determined theoretically, thereby improving the accuracy ....Theoretically derived calibration of the neutron moisture meter. The moisture content of soils is of key importance in a wide range of situations including agriculture, engineering and land and water management. The measurement of soil moisture contents in the field is problematic, and even commonly used methods like the neutron probe give results of limited accuracy. This research will enable calibration curves for the neutron probe to be determined theoretically, thereby improving the accuracy of moisture content measurements and enhancing its usefulness to industry and research.Read moreRead less
Special Research Initiatives - Grant ID: SR0354511
Funder
Australian Research Council
Funding Amount
$10,000.00
Summary
Soil Acidification, the Environment and Production. Soil acidification affects 50% of Australia's agricultural land and is the most important economic constraint to agricultural. In addition, major external offsite impacts include greenhouse gas emissions, reduced stream and ground water health, reduced biodiversity, increased salinity and waterlogging and infrastructure damage. The aim of this network is to quantify the acidification processes and the connection of these processes to the offsit ....Soil Acidification, the Environment and Production. Soil acidification affects 50% of Australia's agricultural land and is the most important economic constraint to agricultural. In addition, major external offsite impacts include greenhouse gas emissions, reduced stream and ground water health, reduced biodiversity, increased salinity and waterlogging and infrastructure damage. The aim of this network is to quantify the acidification processes and the connection of these processes to the offsite impacts. This will lead to development of strategic plans for acidified and potential acid soils and associate offsite impacts, as well as identifying knowledge gaps and building research and policy synergies. Read moreRead less
Environmental risk assessment of acid sulfate soil formation and pollutant generation in Swan Coastal Plain. The urgency and importance of securing water sources for human use in a sustainable manner is dictated by drying climate and rapid population expansion in Australia. Dropping groundwater levels (less recharge, increased abstraction, enhanced drainage) result in formation of acid sulfate soils in oxidised layers that contain acid-bearing minerals. This project will produce an environmental ....Environmental risk assessment of acid sulfate soil formation and pollutant generation in Swan Coastal Plain. The urgency and importance of securing water sources for human use in a sustainable manner is dictated by drying climate and rapid population expansion in Australia. Dropping groundwater levels (less recharge, increased abstraction, enhanced drainage) result in formation of acid sulfate soils in oxidised layers that contain acid-bearing minerals. This project will produce an environmental risk assessment framework as a basis for (i) educated decisions regarding land development and soil disturbance vs conservation as well as (ii) identifying areas suitable for water abstraction from groundwater resources. This will ensure sustainable use of precious groundwater resources in this drying continent of ours.Read moreRead less
Production and transport of soil and sediments, determined by cosmogenic radionuclides and noble gases. Basic questions concerning Australia's soil and regolith resources are addressed through measurement of nuclides produced by cosmic rays in near-surface minerals. Cosmogenic Be-10, Ne-21 and Al-26 are used to (i) quantify the sustainable levels of soil loss, (ii) assess long-term mixing rates, (iii) quantify dispersion and flux of regolith materials from hill-slopes to rivers, and (iv) determi ....Production and transport of soil and sediments, determined by cosmogenic radionuclides and noble gases. Basic questions concerning Australia's soil and regolith resources are addressed through measurement of nuclides produced by cosmic rays in near-surface minerals. Cosmogenic Be-10, Ne-21 and Al-26 are used to (i) quantify the sustainable levels of soil loss, (ii) assess long-term mixing rates, (iii) quantify dispersion and flux of regolith materials from hill-slopes to rivers, and (iv) determine the rates of sediment movement through Australian rivers and floodplains, including sediment-adsorbed pollutants. The research has strong implications for the usage and conservation of soil, sediments and weathered deposits for agriculture, mineral resources, and sedimentary waste disposal.Read moreRead less
Coal-ash as a resource for sustainable soil-management in plant production systems. Acidification and salinisation are major causes of land degradation in Australia, costing $1-2 billion to combat. Farmers used 1.9M t of lime and 1.0M t of gypsum to manage their soils in 2000. Power stations annually produce 12M t of coal-ash that have functional characteristics of lime and gypsum and can potentially ameliorate degraded land. Presently only 43% of the ash is used and almost entirely for constr ....Coal-ash as a resource for sustainable soil-management in plant production systems. Acidification and salinisation are major causes of land degradation in Australia, costing $1-2 billion to combat. Farmers used 1.9M t of lime and 1.0M t of gypsum to manage their soils in 2000. Power stations annually produce 12M t of coal-ash that have functional characteristics of lime and gypsum and can potentially ameliorate degraded land. Presently only 43% of the ash is used and almost entirely for construction with the rest going into landfills. This project will determine the sustainable use of coal-ash to improve structure and nutritive properties of the soil and to raise crop yield across several sites in Australia.Read moreRead less