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soil carbon

Catalogue: Ground Cover
Research is showing that up to 1.6 million tonnes of carbon a year could be being stripped from agricultural soils by wind erosion... Leading the research, Dr Raphael Viscarra Rossel says the map, showing soil organic carbon stocks for every 90 metre square block across the country to a depth of 30 centimetres, with estimates of uncertainty, draws on soil sampling data, including the GRDC-funded Soil Carbon Research Program... "The map provides a reliable benchmark for monitoring the influence that changes in land cover, climate, land management and greenhouse gases have on soil carbon and carbon dioxide removal from the atmosphere," Dr Viscarra Rossel says...
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Catalogue: GRDC Publications
14 BWD00024: Maintaining profitable farming systems with retained stubble in Victoria and Tasmania .................................... The over-arching aim of the project is to improve yield and water-use-efficiency of irrigated wheat production across the Northern Region by developing improved agronomic practices to reduce the incidence of lodging and increase the yield potential of irrigated wheat... Overall, the project will deliver a comprehensive research, communication and extension program that will ensure more effective management of water repellent agricultural soils in WA whilst building capacity for future soils research and development in Western Australia...
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Catalogue: GRDC Updates (West)
Dr Edmeades commenced his science career in 1977 at the Ministry of Agriculture and Food in Ruakura NZ, initially his research interests were on soil acidity and liming... After 20 years in his role as a soil scientist at Ruakura, Doug left institutional science in 1997 and established his own science consulting business, which has evolved into agKnowledge... This project investigated the role of surface drainage in controlling waterlogging on shallow sandplain soils and the adaptation of species and varieties of cereals and broad-leaved plants to waterlogging...
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Catalogue: GRDC Publications
Soil organic matter contributes to a range of biological, chemical and physical properties of soil and is essential for soil health... Soils rarely reach their theoretical potential for organic matter storage (see Figure 1.7)... In soils with low clay content the amount of humus and resistant soil organic matter is increasingly important to nutrient exchange because its large surface area gathers (adsorbs) cations from the soil solution, holding nutrients that would otherwise leach...
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Catalogue: GRDC Publications
Soil microrganisms also impact on the physical properties of soils including their capacity to hold water... An on-going output will be the coordination of review workshops and reporting processes to ensure that adequate resourcing, integration and consistency measures are being applied across all projects and new opportunities are identified... The major foci of this project are to screen and identify elite diseasesuppressive microbes for cereals and nodulation enhancing beneficial microbes for legumes...
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Catalogue: GRDC Publications
Soil organic carbon makes up about 58 per cent of the mass of organic matter and is usually reported in a soil analysis report as the concentration (i.e. per cent) of organic carbon in soil (see Chapter 1 for more detail)... If a soil has a significant amount of gravel or stone material, this fraction is removed before analysis with the final soil carbon or nutrient assessment being only representative of the mineral component of the remaining soil... Understanding how organic matter cycles through the soil and what drives its accumulation and loss is critical to maintaining it at optimal levels within agricultural systems...
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Catalogue: Nuffield Scholar Reports
The practice of adding biochar to the soil to enhance the soils agricultural value has been undertaken for over two thousand years... Some early studies into the value of biochar as a soil additive suffered due to a lack of knowledge regarding the varying outcomes of the pyrolysis process or potential function of biochar in the soil... With the influence of previous worldwide agricultural practices having left some soils depleted and exposed to risk of loss through erosion and the forecast increases needed in food production, there is a great need on these soils for regenerative agricultural practices to rebuild their productive capacity...
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Catalogue: GRDC Updates
" Date: 08.10.2009 USING ROTATION CROPS TO IMPROVE SOIL QUALITY.. Soil structural differences are measured with a cone penetrometer which determines the force needed to push a metal probe slowly into the soil to 600 mm depth... We measured the microbial properties using surface soil samples (0-10 cm) from the crop rotation experiment...
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Catalogue: Nuffield Scholar Reports
The objective of my study was to understand the principals behind carbon trade and the on ground farming practices that may enhance soil health, increase sequestration and potentially increase greater amounts of soil carbon... I firmly believe that agriculture has a positive role to play in carbon sequestration and although not the sole answer to reducing all CO 2 emissions farmers and farming operations deserve good information to serve them now and into the future... 1% OC = 3.6 kg/m 2= 14.4 litres/m 2= 144,000 litres/ ha The above calculation shows that an increase of 14.4 litres of extra plant available water could be stored per square metre in the top 30cm of soil with a bulk density of 1.2g/m 3, for every 1% increase in the level of soil organic carbon in addition to the current water holding capacity of the soil itself...
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Catalogue: GRDC Updates
As an example, where appropriate use of fertilisers can increase productivity beyond that currently being attained, adjusting the amount or timing of fertiliser application would result in greater carbon inputs to the soil... Recent research results have also noted that the proportion of residue carbon that is retained in a soil to enhance soil carbon stocks can be enhanced by ensuring that enough nutrients exist in the soil to both satisfy the crop requirements and the requirements to build soil organic carbon... If we use the same bulk density as above (1.2 g/cm3) and restrict our calculations to the top 10 cm of soil where organic carbon is most easily increased, at 2% carbon the soil would contain 24 tonnes C/ha...
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