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Organic matter

Catalogue: GRDC Factsheets
" January 2013 rhizobial inoculants FACTSHEET northern, southern and western regions HArveSTing THe BenefiTS Of inOCuLATing LegumeS inoculating legumes with rhizobia can achieve substantial increases in legume nodulation, grain and biomass yield, nitrogen fixation and post-crop soil nitrate levels... KEy Points The benefits of inoculating legumes with rhizobia (soil bacteria that fix nitrogen) have been recognised in Australian agriculture for more than 100 years... The gains are highest when the legume is grown in nil-rhizobia or low-rhizobia soil...
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Catalogue: GRDC Factsheets
" January 2013 rhizobial inoculants FACTSHEET northern, southern and western regions HArveSTing THe BenefiTS Of inOCuLATing LegumeS inoculating legumes with rhizobia can achieve substantial increases in legume nodulation, grain and biomass yield, nitrogen fixation and post-crop soil nitrate levels... KEy Points The benefits of inoculating legumes with rhizobia (soil bacteria that fix nitrogen) have been recognised in Australian agriculture for more than 100 years... The gains are highest when the legume is grown in nil-rhizobia or low-rhizobia soil...
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Catalogue: GRDC Factsheets
" January 2013 rhizobial inoculants FACTSHEET northern, southern and western regions HArveSTing THe BenefiTS Of inOCuLATing LegumeS inoculating legumes with rhizobia can achieve substantial increases in legume nodulation, grain and biomass yield, nitrogen fixation and post-crop soil nitrate levels... KEy Points The benefits of inoculating legumes with rhizobia (soil bacteria that fix nitrogen) have been recognised in Australian agriculture for more than 100 years... The gains are highest when the legume is grown in nil-rhizobia or low-rhizobia soil...
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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: GRDC Publications
Overall, soil CEC and SOC content was greatest in the 0.2 and 0.2-2 m fraction, indicating that size, and probably type, of SOM influenced CEC... Kaiser et al. (2003) found that soils with a high content of black carbon showed increased sorption ability compared with plant- and microbial-derived SOM... Addition of organic amendments can increase P availability to plants by decreasing the P adsorption capacity of soils...
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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 (North)
Farming systems which minimise the movement of soil and water will also minimise the loss of nutrients and pesticides... Overall, the only large difference was the lower Zn when superphosphate was applied... In summary, Mike has found a strategy to help him interpret his yield maps - and is now taking the same approach to other paddocks to maximise fertiliser savings...
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Catalogue: GRDC Updates (South)
Farming systems which minimise the movement of soil and water will also minimise the loss of nutrients and pesticides... Overall, the only large difference was the lower Zn when superphosphate was applied... In summary, Mike has found a strategy to help him interpret his yield maps - and is now taking the same approach to other paddocks to maximise fertiliser savings...
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